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`PROVISIONAL APPLICATION FOR PATENT COVER SHEET
`This is a request for filing a PROVISIONAL APPLICATION FOR PATENT under 3? CFR 1.53m).
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`SIGNATURE I'I'imothy W. Marklsonl
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`Date 4-21-05
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`REGISTRATION N0. 33,534
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`Docket Number: BP4637
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`DOCKET NO. BP 463?
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`TITLE OF THE INVENTION
`
`REDUCED FEEDBACK FOR BEAMFORMING IN A WIRELESS
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`COMMUNICATION
`
`BACKGROUND OF THE INVENTION
`
`TECHNICAL FIELD OF THE INVENTION
`
`This invention relates generally to wireless communication systems and more
`
`particularly to wireless communications using beamforming.
`
`DESCRIPTION OF RELATED ART
`
`Communication systems are known to support wireless
`
`and wire lined
`
`communications between wireless and/or wire lined communication devices.
`
`Such
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`communication systems range from national and/or international cellular telephone
`
`systems to the Intemet to point-to-point
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`in-home wireless networks. Each type of
`
`communication system is constructed, and hence operates,
`
`in accordance with one or
`
`more communication standards. For instance, wireless communication systems may
`
`operate in accordance with one or more standards including, but not limited to, IEEE
`802.1l, Bluetooth, advanced mobile phone services (AMPS), digital AMPS, global
`
`system for mobile communications (GSM), code division multiple access (CDMA), local
`
`multi-point distribution systems (LMDS), multi-channel-multi-point distribution systems
`
`(MMDS), andfor variations thereof.
`
`Depending on the type of wireless
`
`communication system,
`
`a wireless
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`communication device, such as a cellular telephone,
`
`two-way radio, personal digital
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`assistant
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`(FDA), personal computer
`
`(PC),
`
`laptop computer, home entertainment
`
`equipment,
`
`et cetera
`
`communicates directly or
`
`indirectly with other wireless
`
`communication devices.
`
`For direct communications (also known as point—to-point
`
`communications), the participating wireless communication devices tune their receivers
`
`and transmitters to the same channel or channels (e.g., one of the plurality of radio
`
`frequency (RF) carriers of the wireless communication system) and communicate over
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`DOCKET NO. BP 4637
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`that channel(s). For indirect wireless communications, each wireless communication
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`device communicates directly with an associated base station (eg, for cellular services)
`
`and/or an associated access point (e.g., for an in-home or in-building wireless network)
`
`via an assigned channel. To complete a communication connection between the wireless
`communication devices,
`the associated base stations and/or associated access points
`
`communicate with each other directly, via a system controller, via the public switch
`
`telephone network, via the Internet, and/or via some other wide area network.
`
`For
`
`each wireless
`
`communication
`
`device
`
`to
`
`participate
`
`in wireless
`
`communications, it includes a built-in radio transceiver (i.e., receiver and tranSmitter) or
`
`is coupled to an associated radio transceiver (e.g., a station for in-home and/or in-building
`
`wireless communication networks, RF modem, etc). As is known, the receiver is
`
`coupled to the antenna and includes a low noise amplifier, one or more intermediate
`
`frequency stages, a filtering stage, and a data recovery stage. The low noise amplifier
`
`receives inbound RF signals via the antenna and amplifies then. The one or more
`
`intermediate frequency stages mix the amplified RF signals with one or more local
`
`oscillations to convert the amplified RF signal
`
`into baseband signals or intermediate
`
`frequency (IF) signals. The filtering stage filters the baseband signals or the IF signals to
`
`attenuate unwanted out of band signals to produce filtered signals. The data recovery
`
`stage recovers raw data from the filtered signals in accordance with the particular
`
`wireless communication standard.
`
`As is also known, the transmitter includes a data modulation stage, one or more
`
`intermediate frequency stages, and a power amplifier. The data modulation stage
`
`converts raw data into baseband signals in accordance with a particular wireless
`
`communication standard.
`
`The one or more intermediate frequency stages mix the
`
`baseband signals with one or more local oscillations to produce RF signals. The power
`
`amplifier amplifies the RF signals prior to transmission via an antenna.
`
`In many systems, the transmitter will include one antenna for transmitting the RF
`
`signals, which are received by a single antenna, or multiple antennas, of a receiver.
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`DOCKET NO. BP 4637
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`When the receiver includes two or more antennas, the receiver will select one of them to
`
`receive the incoming RF signals.
`
`In this instance, the wireless communication between
`
`the transmitter and receiver is a sing]e-output-single-input {8180) communication, even
`
`if the receiver includes multiple antennas that are used as diversity antennas (i.e.,
`
`selecting one of them to receive the incoming RF signals).
`
`For 8180 wireless
`
`communications, a transceiver includes one transmitter and one receiver. Currently, most
`
`wireless local area networks (WLAN) that are IEEE 802.11, 802.11a,_802,llb, or
`
`802.11g employ SISO wireless communications.
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`Other
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`types of wireless communications include single-input-multiple-output
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`(SIMO), multiple-input-single-output
`
`(M180),
`
`and multiple-input-multiple-output
`
`(MIMO).
`
`In a SIMO wireless communication, a single transmitter processes data into
`
`radio frequency signals that are transmitted to a receiver. The receiver includes two or
`
`more antennas and two or more receiver paths. Each of the antennas receives the RF
`
`signals and provides them to a corresponding receiver path (e.g., LNA, down conversion
`
`module, filters, and ADCs). Each of the receiver paths processes the received RF signals
`
`to produce digital signals, which are combined and then processed to recapture the
`
`transmitted data.
`
`For
`
`a
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`rnultiple-input—single—output
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`(MISO) wireless
`
`communication,
`
`the
`
`transmitter includes two or more transmission paths (e.g., digital to analog converter,
`
`filters, up-conversion module, and a power amplifier) that each converts a corresponding
`
`portion of baseband signals into RF signals, which are transmitted via corresponding
`
`antennas to a receiver. The receiver includes a single receiver path that receives the
`
`multiple RF signals from the transmitter.
`
`In this instance, the receiver uses beam formng
`
`to combine the multiple RF signals into one signal for processing.
`
`For a multiple-input-multiple—output
`
`(MIMO) wireless communication,
`
`the
`
`transmitter and receiver each include multiple paths.
`
`In such a communication, the
`
`transmitter parallel processes data using a spatial and time encoding function to produce
`
`two or more streams of data. The transmitter includes multiple transmission paths to
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`DOCKET NO. BP 4E6?!
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`convert each stream of data into multiple RF signals. The receiver receives the multiple
`
`RF signals via multiple receiver paths that recapture the streams of data utilizing a Spatial
`
`and time decoding function.
`
`The recaptured streams of data are combined and
`
`. subsequently processed to recover the original data.
`
`To further
`
`improve wireless communications,
`
`transceivers may incorporate
`
`beamforming.
`
`In general, beamforrning is a processing technique to create a focused
`
`antenna beam by shifting a signal in time or in phase to provide gain of the signal in a
`
`desired direction and to attenuate the signal in other directions.
`
`In order for a transmitter
`
`to properly implement beamfonning,
`
`it needs to know properties of the channel over
`
`which the wireless communication is conveyed. Accordingly, the receiver must provide
`
`feedback information for the transmitter to determine the properties of the channel. The
`
`feedback information may be sent as a receiver determined beamfonning matrix (V) if a
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`singular value decomposition can be determined or it may be sent as a channel matrix
`
`(H). In either case, the feedback information is substantial in size and includes Cartesian
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`coordinates for the matrix values. Such Cartesian coordinates leads to unevenly spaced
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`angles.
`
`Therefore, a need exists for a method and apparatus for reducing beamforming
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`'20
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`feedback information for wireless communications.
`
`BRIEF SUMMARY OF THE INVENTION
`
`The present invention is directed to apparatus and methods of operation that are
`
`further described in the following Brief Description of the Drawings,
`
`the Detailed
`
`Description of the Invention, and the claims. Other features and advantages of the
`
`present invention will become apparent from the following detailed description of the
`
`invention made with reference to the accompanying drawings.
`
`BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
`
`Figure l
`
`is a schematic block diagram of a wireless communication system in
`
`accordance with the present invention;
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`DOCKET NO. BP 4637
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`Figure 2 is a schematic block diagram of a wireless communication device in
`
`accordance with the present invention;
`
`Figure 3 is a schematic block diagram of another wireless communication device
`
`in accordance with the present invention;
`
`Figure 4 is a schematic block diagram of baseband transmit processing in
`
`accordance with the present inventiOn;
`
`Figure 5 is a schematic block diagram of baseband receive processing in
`
`accordance with the present invention; and
`
`Figure 6 is a schematic block diagram of a beamforming wireless communication
`
`in accordance with the present invention.
`
`DETAILED DESCRIPTION OF THE INVENTION
`
`Figure l is a schematic block diagram illustrating a communication system 10 that
`
`includes a piurality of base stations and/or access points 12, 16, a plurality of wireless
`
`communication devices 18—32 and a network hardware component 34. Note that the
`
`network hardware 34, which may be a router, switch, bridge, modem, system controller,
`
`et cetera provides a wide area network connection 42 for the communication system 10.
`
`Further note that
`
`the wireless communication devices 18-32 may be laptop host
`
`computers 18 and 26, personal digital assistant hosts 20 and 30, personal computer hosts
`
`24 and 32 andfor cellular telephone hosts 22 and 28. The details of the wireless
`
`communication devices will be described in greater detail with reference to Figure 2.
`
`Wireless communication devices 22, 23, and 24 are located within an independent
`
`basic service set (IBSS) area and corru'nunicate directly (i.e., point to point).
`
`In this
`
`configuration, these devices 22, 23, and 24 may only communicate with each other. To
`
`communicate with other wireless communication devices within the system 10 or to
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`DOCKET NO. BP 4637
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`communicate outside of the system 10, the devices 22, 23, and/or 24 need to affiliate with
`
`one of the base stations or access points 12 or 16.
`
`The base stations or access points 12, 16 are located within basic service set
`
`(BSS) areas 1 1 and 13, respectively, and are operably coupled to the network hardware
`
`34 via local area network connections 36, 38. Such a connection provides the base
`
`station or access point 12 16 with connectivity to other devices within the system 10 and‘
`
`provides connectivity to other networks via the WAN connection 42. To communicate
`
`with the wireless communication devices within its 388 11 or 13, each of the base
`
`10
`
`stations or access points 12—16 has an associated antenna or antenna array. For instance,
`
`base station or access point 12 wirelessly communicates with wireless communication
`
`devices 18 and 20 while base station or access point 16 wirelessly communicates with
`
`wireless communication devices 26 — 32. Typically, the wireless communication devices
`
`register with a particular base station or access point 12, 16 to receive services from the
`
`15
`
`communication system 10.
`
`Typically, base stations are used for cellular telephone systems and like-type
`
`systems, while access points are used for in-home or in-building wireless networks (e.g.,
`
`IEEE 802.11 and versions thereof, Bluetooth, andfor any other type of radio frequency
`
`based network protocol). Regardless of the particular type of communication system,
`
`each wireless communication device includes a built-in radio and/or is coupled to a radio.
`
`Figure 2 is a schematic block diagram illustrating a wireless communication
`device that includes the host device 18—32 and an associated radio 60. For cellular
`
`telephone hosts, the radio 60 is a built-in component. For personal digital assistants
`
`hosts, laptop hosts, and/or personal computer hosts, the radio 60 may be built-in or an
`
`externally coupled component.
`
`As illustrated, the host device 18—32 includes a processing module 50, memory
`
`52, a radio interface 54, an input interface 58, and an output interface 56. The processing
`
`module 50 and memory 52 execute the corresponding instructions that are typically done
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`DOCKET NO. BP 4637
`
`by the host device. For example, for a cellular telephone host device, the processing
`
`module .50 performs the corresponding communication functions in accordance with a
`
`particular cellular telephone standard.
`
`The radio interface 54 allows data to be received from and sent to the radio 60.
`
`For data received from the radio 60 (e.g., inbound data), the radio interface 54 provides
`
`the data to the processing module 50 for further processing andfor routing to the output
`interface 56. The output interface 56 provides connectivity to an output display device
`
`such as a display, monitor, speakers, et cetera such that
`
`the received data may be
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`
`displayed. The radio interface 54 aiso provides data from the processing module 50 to
`
`the radio 60. The processing module 50 may receive the outbound data from an input
`
`device such as a keyboard, keypad, microphone, et cetera via the input interface 58 or
`
`generate the data itself. For data received via the input interface 58,
`
`the processing
`
`module 50 may perform a corresponding host function on the data andlor route it to the
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`radio 60 via the radio interface 54.
`
`Radio 60 includes a host interface 62, digital receiver processing module 64, an
`
`analog—to-digital converter 66, a high pass and low pass filter module 68, an IF mixing
`
`down conversion stage 70,
`
`a receiver
`
`filter 7], a
`
`low noise amplifier 72, a
`
`transmitter/receiver switch 73, a local oscillation module 74, memory 75, a digital
`
`transmitter processing module 76, a digital-to-analog converter 78, a filtering/gain
`
`module 80, an IF mixing up conversion stage 82, a power amplifier 84, a transmitter filter
`
`module 85, a channel bandwidth adjust module 87, and an antenna 86. The antenna 86
`
`may be a single antenna that is shared by the transmit and receive paths as regulated by
`
`the Tit/Rx switch 73, or may include separate antennas for the tranSmit path and receive
`
`path. The antenna implementation will depend on the particular standard to which the
`
`wireless communicationdevice is compliant.
`
`The digital receiver processing module 64 and the digital transmitter processing
`
`module 76, in combination with operational instructions stored in memory 75, execute
`
`digital receiver functions and digital
`
`transmitter functions, respectively. The digital
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`DOCKET NO. BP 4637
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`receiver functions include, but are not
`
`limited to, digital
`
`intermediate frequency to
`
`baseband conversion, demodulation,
`
`constellation demapping,
`
`decoding,
`
`andfor
`
`desorambling.
`
`The digital
`
`transmitter
`
`functions include, but are not
`
`limited to,
`
`scrambling, encoding, constellation mapping, modulation, andfor digital baseband to IF
`
`conversion. The digital receiver and transmitter processing modules 64 and 76 may be
`
`implemented using a shared processing device,
`
`individual processing devices, or a
`
`plurality of processing devices. Such a processing device may be a microprocessor,
`
`micro-controller, digital signal processor, microcomputer, central processing unit, field
`
`programmable gate array, programmable logic device, state machine,
`
`logic circuitry,
`
`analog circuitry, digital circuitry, and/or any device that manipulates signals (analog
`
`and/or digital) based on operational
`
`instructions. The memory 75 may be a single
`
`memory device or a plurality of memory devices. Such a memory device may be a read—
`
`only memory, random access memory, volatile memory, non-volatile memory, static
`
`memory, dynamic memory,
`
`flash memory, and/or any device that stores digital
`
`information. Note that when the processing module 64 and/or 76 implements one or
`
`more of its functions via a state machine, analog circuitry, digital circuitry, and/or logic
`
`circuitry, the memory storing the corresponding operational
`
`instructions is embedded
`
`with the circuitry comprising the state machine, analog circuitry, digital circuitry, and/or
`
`logic circuitry.
`
`In operation, the radio 60 receives outbound data 94 from the host device via the
`
`host interface 62. The host
`
`interface 62 routes the outbound data 94 to the digital
`
`transmitter processing module 76, which processes the outbound data 94 in accordance
`
`with a particular wireless communication standard (e.g., IEEE 802.11, Bluetooth, et
`
`cetera) to produce outbound baseband signals 96. The outbound baseband signals 96 will
`
`be digital base-band signals (e.g., have a zero IF) or a digital low IF signals, where the
`
`low IF typically will be in the frequency range of one hundred kilohertz to a few
`
`megahertz.
`
`The digital-to-analog converter 78 converts the outbound baseband signals 96
`
`from the digital domain to the analog domain. The filtering/gain module 80 filters and/or
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`DOCKET NO. BP 4637
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`adjusts the gain of the analog signals prior to providing it to the IF mixing stage 82. The
`
`IF miiting stage 82 converts the analog baseband or low IF signals into RF signals based
`
`on a transmitter local oscillation 83 provided by local oscillation module 74. The power
`
`amplifier 84 amplifies the RF signals to produce outbound RF signals 98, which are
`
`filtered by the transmitter filter module 85. The antenna 86 transmits the outbound RF
`
`signals 98 to a targeted device such as a base station, an access point andlor another
`
`wireless communication device.
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`The radio 60 also receives inbound RF signals 88 via the antenna 86, which were
`
`transmitted by a base station, an access point, or another wireless communication device.
`
`The antenna 86 provides the inbound RF signals 88 to the receiver filter module 7] via
`
`the TX/RX switch 73, where the Rx filter 71 bandpass filters the inbound RF signals 88.
`
`The Rx filter 7] provides the filtered RF signals to low noise amplifier 72, which
`
`amplifies the signals 88 to produce an amplified inbound RF signals. The low noise
`
`amplifier 72 provides the amplified inbound RF signals to the IF mixing module 70,
`
`which directly converts the amplified inbound RF signals into an inbound low IF signals
`
`or baseband signals based on a receiver local oscillation 8] provided by local oscillation
`
`module 74. The down conversion module 70 provides the inbound low IF signals or
`
`baseband signals to the filtering/gain module 68. The high pass and low pass filter
`
`module 68 filters, based on settings provided by the channel bandwidth adjust module 87,
`
`the inbound low IF signals or the inbound baseband signals to produce filtered inbound
`
`signals.
`
`The analog-to-digital converter 66 converts the filtered inbound signals from the
`
`25.
`
`analog domain to the digital domain to produce inbound baseband signals 90, where the
`
`inbound baseband signals 90 will be digital base-band signals or digital low IF signals,
`
`where the low IF typically will be in the frequency range of one hundred kilohertz to a
`
`few megahertz. The digital receiver processing module 64, based on settings provided
`
`by the channel bandwidth adjust module 87, decodes, descrambles, demaps, and/or
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`30
`
`demodulales the inbound baseband signals 90 to recapture inbound data 92 in accordance
`
`with the particular wireless communication standard being implemented by radio 60.
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`DOCKET NO. BP 4637
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`The host interface 62 provides the recaptured inbound data 92 to the host device 18-32
`via the radio interface 54.
`
`As one of average skill
`
`in the art will appreciate, the wireless communication
`
`device of figure 2 may be implemented using one or more integrated circuits. For
`
`example,
`
`the host device may be implemented on one integrated circuit,
`
`the digital
`
`receiVer processing module 64, the digital transmitter processing module 76 and memory
`
`75 may be implemented on a second integrated circuit, and the remaining components of
`
`the radio 60, less the antenna 86, may be implemented on a third integrated circuit. As an
`
`alternate example, the radio 60 may be implemented on a single integrated circuit. As yet
`
`another example, the processing module 50 of the host device and the digital receiver and
`
`transmitter processing modules 64 and 76 may be a common processing device
`
`implemented on a single integrated circuit. Further, the memory 52 and memory 75 may
`
`be implemented on a single integrated circuit and/or on the same integrated circuit as the
`
`common processing modules of processing module 50 and the digital receiver and
`
`transmitter processing module 64 and 76.
`
`Figure 3 is a schematic block diagram illustrating a wireless communication
`
`device that includes the host device 18—32 and an associated radio 60. For cellular
`
`telephone hosts, the radio 60 is a built—in component. For personal digital assistants
`
`hosts, laptop hosts, and/or personal computer hosts, the radio 60 may be built-in or an
`
`externally coupled component.
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`As illustrated, the host device 18-32 includes a processing module 50, memory
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`,25
`
`52, radio interface 54, input interface 58 and output interface 56. The processing module
`
`50 and memory 52 execute the corresponding instructions that are typically done by the
`
`host device. For example, for a cellular telephone host device, the processing module 50
`
`performs the corresponding communication functions in accordance with a particular
`
`cellular telephone standard.
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`DOCKET NO. BP 4637
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`The radio interface 54 allows data to be received from and sent to the radio 60.
`
`For data received from the radio 60 (e.g., inbound data), the radio interface 54 provides
`
`the data to the processing module 50 for further processing andfor routing to the output
`
`interface 56. The output interface 56 provides connectivity to an output display device
`Such as a display, monitor, speakers, et cetera Such that
`the received data may be
`
`displayed. The radio interface 54 also provides data from the processing module 50 to
`the radio 60. The processing module 50 may receive the outbound data from an input
`
`device such as a keyboard, keypad, microphone, et cetera via the input interface 58 or
`
`generate the data itself. For data received via the input interface 58, the processing
`module 50 may perform a corresponding host function on the data andlor route it to the ‘
`radio 60 via the radio interface 54.
`
`Radio 60 includes a host
`
`interface 62, a baseband processing module 100,
`
`memory 65, a plurality of radio frequency (RF) transmitters 106 - l 10, a transmit/receive
`
`(T/R) module 1 14, a plurality of antennas 81 - 35, a plurality ofRF receivers l 18 - 120, a
`
`channel bandwidth adjust module 87, and a local oscillation module 74. The baseband
`
`processing module 100, in combination with operational instructions stored in memory
`
`65, executes digital receiver functions and digital transmitter functions, respectively. The
`
`digital receiver functions include, but are not limited to, digital intermediate frequency to
`
`baseband conversion, demodulation, constellation demapping, decoding, de-interleaving,
`
`fast Fourier
`
`transform, cyclic prefix removal, Space and time decoding, and/or
`
`descrambling.
`
`The digital
`
`transmitter
`
`functions include, but are not
`
`limited to,
`
`scrambling, encoding,
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`interleaving, constellation mapping, modulation,
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`inverse fast
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`Fourier transform, cyclic prefix addition, space and time encoding, and digital baseband
`
`to [F conversion. The baseband processing modules 100 may be implemented using one
`
`or more processing devices. Such a processing device may be a microprocessor, micro-
`
`controller, digital
`
`signal processor, microcomputer, central processing unit,
`
`field
`
`programmable gate array, programmable logic device, state machine,
`
`logic circuitry,
`
`analog circuitry, digital circuitry, and/or any device that manipulates signals (analog
`
`and/or digital) based on operational
`
`instructions. The memory 65 may be a single
`
`memory device or a plurality of memory devices. Such a memory device may be a read-
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`DOCKET NO. BP 4637
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`only memory, random access memory, volatile memory, non—volatile memory, static
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`memory, dynamic memory,
`
`flash memory, andfor any device that
`
`stores digital
`
`information. Note that when the processing module 100 implements one or more of its
`
`functions via a state machine, analog circuitry, digital circuitry, and/or logic circuitry, the
`
`memory storing the corresponding operational instructions is embedded with the circuitry
`
`comprising the state machine, analog circuitry, digital circuitry, andlor logic circuitry.
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`10
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`15
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`20
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`In operation, the radio 60 receives outbound data 94 from the host device via the
`
`host interface 62. The baseband processing module 64 receives the outbound data 38
`
`and, based on a mode selection signal 102, produces one or more outbound symbol
`
`streams 90. The mode selection signal 102 will indicate a particular mode of operation
`
`that is compliant with one or more specific modes of the various IEEE 302.1 1 standards.
`
`For example, the mode selection signal 102 may indicate a frequency band of 2.4 GHz, 3
`
`channel bandwidth of 20 or 22 MHz and a maximum bit rate of 54 megabits-per—second.
`
`In this general category, the mode selection signal will further indicate a particular rate
`
`ranging from 1 megabit-per-second to 54 megabits-per-second.
`
`In addition, the mode
`
`selection signal will indicate a particular type of modulation, which includes, but is not
`
`limited to, Barker Code Modulation, BPSK, QPSK, CCK, 16 QAM and/or 64 QAM. The
`
`mode select signal 102 may also include a code rate, a number of coded bits per
`
`subcarrier (NBPSC), coded bits per OFDM symbol (NCBPS), and/or data bits per OFDM
`
`symbol
`
`(NDBPS). The mode selection signal 102 may also indicate a particular
`
`channelization for
`
`the corresponding mode that provides a channel number and
`
`corresponding center frequency. The mode select signal 102 may further indicate a
`
`power spectral density mask value and a number of antennas to be initially used for a
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`25
`
`MIMO communication.
`
`The baseband proce55ing module 100, based on the mode selection signal 102
`
`produces one or more outbound symbol streams 104 from the outbound data 94. For
`
`example, if the mode selection signal 102 indicates that a single transmit antenna is being
`
`30
`
`utilized for the particular mode that has been selected, the baseband processing module
`
`100 will produce a single outbound symbol stream 104. Alternatively, if the mode select
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`signal 102 indicates 2, 3 or 4 antennas, the baseband processing module 100 will produce
`
`2, 3 or 4 outbound symbol streams 104 from the outbound data 94.
`
`Depending on the number of outbound streams 104 produced by the baseband
`
`module 10, a corresponding number of the RF transmitters 106 - 110 will be enabled to
`
`convert the outbound symbol streams 104 into Outbound RF signals 112.
`In general, each
`of the RF transmitters 106 — 110 includes a digital filter and upsampling module, a digital
`
`to analog conversion module, an analog filter module, a frequency up conversion module,
`
`a power amplifier, and a radio frequency bandpass filter. The RF transmitters 106 - 110
`
`provide the outbound RF signals 112 to the transmit/receive module 114, which provides
`
`each outbound RF signal to a corresponding antenna 81 - 85.
`
`When the radio 60 is in the receive mode, the transmitlreceive module 114
`
`receives one or more inbound RF signals 116 via the antennas 81 m 85 and provides them
`
`to one or more RF receivers 118 - 122, which will be described in greater detail with
`
`reference to Figure 4. The RF receiver 118 — 122, based on settings provided by the
`
`channel bandwidth adjust module 87, converts the inbound RF signals 116 into a
`
`corresponding number of inbound symbol streams 124. The number of inbound symbol
`
`streams 124 will correspond to the particular mode in which the data was received. The
`
`baseband processing module 100 converts the inbound symbol streams 124 into inbound
`
`data 92, which is provided to the host device 18552 via the host interface 62.
`
`As one of average skill
`
`in the art will appreciate, the wireless communication
`
`device of figure 3 may be implemented using one or more integrated circuits. For
`
`example, the host device may be implemented on one integrated circuit, the baseband
`
`processing module 100 and memory 65 may be implemented on a second integrated
`
`circuit, and the remaining components of the radio 60, less the antennas 81 - 85, may be
`
`implemented on a third integrated circuit. As an alternate example, the radio 60 may be
`
`implemented on a single integrated circuit. As yet another example, the processing
`
`module 50 of the host device and the baseband processing module 100 may be a common
`
`processing device implemented on