I 1111111111111111 11111 1111111111 111111111111111 IIIII IIIII IIIIII IIII IIII IIII
`US007016658B2
`
`(12) United States Patent
`Kim et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,016,658 B2
`Mar.21,2006
`
`(54)
`
`(75)
`
`APPARATUS AND METHOD FOR
`TRANSMITTING/RECEIVING DATA
`ACCORDING TO CHANNEL CONDITION IN
`A CDMA MOBILE COMMUNICATION
`SYSTEM WITH ANTENNA ARRAY
`Inventors: Sung-Jin Kim, Suwon-shi (KR);
`Hun-Kee Kim, Seoul (KR); Ju-Ho
`Lee, Suwon-shi (KR); Yong-Suk Lee,
`Yongin-shi (KR)
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`5,691,995 A *
`6,317,462 Bl*
`6,473,393 Bl *
`6,662,024 Bl *
`6,826,233 Bl *
`6,925,131 Bl *
`
`11/1997 Ikeda et al. ................. 714/786
`11/2001 Boyce ................... 375/240.27
`10/2002 Ariyavisitakul et al.
`.... 370/203
`12/2003 Walton et al.
`........... 455/562.1
`11/2004 Oosawa ................. 375/240.27
`8/2005 Balakrishnan et al. ...... 375/299
`
`(73) Assignee: Samsung Electronics Co., Ltd., (KR)
`
`CA
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 579 days.
`
`(21) Appl. No.: 10/337,711
`
`(22) Filed:
`
`Jan. 7, 2003
`
`Prior Publication Data
`
`US 2003/0128769 Al
`
`Jul. 10, 2003
`
`(65)
`
`(30)
`
`Foreign Application Priority Data
`(KR)
`
`...................... 10-2002-0000837
`
`Jan. 7, 2002
`Int. Cl.
`(51)
`H04B 1/02
`(2006.01)
`H04J 3/22
`(2006.01)
`HOJM 13/00
`(2006.01)
`H04L 5/12
`(2006.01)
`(52) U.S. Cl. ...................... 455/102; 455/103; 455/272;
`455/273; 455/277.2; 370/204; 370/465; 370/543;
`714/757; 714/780; 714/810; 375/264; 375/240.27
`(58) Field of Classification Search ................ 455/102,
`455/103, 108, 110, 111, 115.1, 115.3, 450,
`455/452.2, 504-506, 512, 513, 67.11, 69,
`455/132-136, 272,273,275,276.1, 277.1;
`370/464-469,479,480,533-544,203,204,
`370/208, 211,441; 714/746-768, 780, 784,
`714/786, 790, 799-805, 810; 375/240.24-240.27,
`375/261,264,265,242,253,316,324,325,
`375/340, 349
`See application file for complete search history.
`
`FOREIGN PATENT DOCUMENTS
`* 3/2002
`
`2 391 905
`
`OTHER PUBLICATIONS
`
`S. Antipolis, "Enhanced Symbol Mapping method for the
`modulation of Turbo-coded bits based on bit priority", 3GPP
`TSG RAN WG1/Wg2 Joint Meeting on HSDPA, Apr. 5-6,
`2001.*
`
`* cited by examiner
`
`Primary Examiner-Due M. Nguyen
`(74) Attorney, Agent, or Firm-Dilworth & Barrese, LLP
`
`(57)
`
`ABSTRACT
`Disclosed is a method for providing first and second inter(cid:173)
`leaved bit streams to a modulator in order to transmit the first
`and second interleaved bit streams through at least two
`antennas in a mobile communication system. An encoder
`encodes a transmission data stream into a first bit stream
`with first priority and a second bit stream with second
`priority being lower than the first priority. An interleaver
`interleaves the first and second bit streams into the first and
`second interleaved bit streams. The modulator modulates the
`first and second interleaved bit streams. The method com(cid:173)
`prises distributing the first interleaved bit stream into first
`assignment bit streams for the respective antennas and the
`second interleaved bit stream into second assignment bit
`streams for the respective antennas according to power
`condition information of the respective antennas; and gen(cid:173)
`erating combination bit streams by combining the first
`assignment bit streams and the second assignment bit
`streams, distributed according to the respective antennas,
`and providing the generated combination bit streams to the
`modulator.
`
`25 Claims, 9 Drawing Sheets
`
`60
`
`64-
`-64-1
`INfERLEA'JEA s
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`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 1 of 23
`
`

`

`U.S. Patent
`
`Mar.21,2006
`
`Sheet 1 of 9
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`US 7,016,658 B2
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`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 2 of 23
`
`

`

`U.S. Patent
`
`Mar. 21, 2006
`
`Sheet 2 of 9
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`US 7,016,658 B2
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`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 3 of 23
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`

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`24
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`
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`
`~ = ......
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`Pfor ANT.3
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`
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`S for ANT.3
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`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 4 of 23
`
`

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`
`[ 10B
`
`22 ""\
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 5 of 23
`
`

`

`U.S. Patent
`
`Mar. 21, 2006
`
`Sheet 5 of 9
`
`US 7,016,658 B2
`
`s
`
`p
`
`66
`T
`
`66-1
`66-1-1
`1 ST BUFFER ...,_-+--S_fo_r _AN_T._1 ...
`
`66-1-2
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`
`66-~-3
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`
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`
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`7TH BUFFER 1----+-_P _for_A_NT_.3_,.
`
`66-2-4
`8TH BUFFER ...,_~P--'-fo_r _ANT_.4_.,.
`
`FIG.5
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 6 of 23
`
`

`

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`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 7 of 23
`
`

`

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`
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`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 8 of 23
`
`

`

`U.S. Patent
`
`Mar. 21, 2006
`
`Sheet 8 of 9
`
`US 7,016,658 B2
`
`START
`
`SEPARATE CODED DATA INTO
`SYSTEMATIC BITS AND PARITY BITS
`
`144
`
`INTERLEAVE
`SYSTEMATIC BITS
`
`ASSIGN
`SYSTEMATIC BITS
`TO TX ANTENNAS
`
`146-1
`
`148--1
`
`INTERLEAVE
`PARITY BITS
`
`ASSIGN
`PARITY BITS
`TO TX ANTENNAS
`
`146-2
`
`148-2
`
`MULTIPLEX SYSTEMATIC BITS
`AND PARITY BITS ACCORDING
`TO TX ANTENNAS
`
`MODUlA TE MULTIPLEXED
`TRANSMISSION DATA
`ACCORDING TO TX ANTENNAS
`
`ASSIGN TRANSMISSION DATA
`TO TRANSMISSION ANTENNAS
`
`TRANSMIT TRANSMISSION
`DATA THROUGH TRANSMISSION
`ANTENNA ARRAY
`
`150
`
`152
`
`154
`
`156
`
`FIG.8
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 9 of 23
`
`

`

`U.S. Patent
`
`Mar. 21, 2006
`
`Sheet 9 of 9
`
`US 7,016,658 B2
`
`START
`
`RECEIVE DATA TRANSMITTED FROM
`Node 8 THROUGH RX ANTENNA ARRAY
`
`SEPARATE RECEIVED DATA ACCORDING
`TO TX ANTENNAS AND DEMODULATE
`SEPARATED RECEIVED DATA
`
`SEPARATE OEMODUL'\TED RECEIVED
`DATA INTO SYSTEMATIC BITS ANO PARITY
`ans ACCORDING TO TX ANTENNAS
`
`1 BO
`
`162
`
`164
`
`MULTIPLEX DATA
`STREAMS WITH
`SYSTEMATIC BITS
`INTO ONE DATA STREAM
`
`166-1
`
`MULTIPLEX DATA
`STREAMS WITH
`PARITY ens INTO
`ONE DATA STREAM
`
`166-2
`
`DEINTERLEAVE
`SYSTEMATIC BITS
`
`168-1
`
`DEINTERLEAVE
`PARITY BlTS
`
`168-2
`
`DECODE SYSTEMATIC 8ITS AND
`PARITY BITS BY CHANNEL DECODER
`
`OUTPUT RECEIVED DATA
`
`170
`
`172
`
`ENO
`
`FIG.9
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 10 of 23
`
`

`

`US 7,016,658 B2
`
`1
`APPARATUS AND METHOD FOR
`TRANSMITTING/RECEIVING DATA
`ACCORDING TO CHANNEL CONDITION IN
`A CDMA MOBILE COMMUNICATION
`SYSTEM WITH ANTENNA ARRAY
`
`PRIORITY
`
`This application claims priority to an application entitled
`"Apparatus and Method for Transmitting/Receiving Data
`According to Channel Condition in a CDMA Mobile Com(cid:173)
`munication System with Antenna Array" filed in the Korean
`Industrial Property Office on Jan. 7, 2002 and assigned
`Serial No. 2002-837, the contents of which are incorporated
`herein by reference herein.
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the Invention
`The present invention relates generally to a data trans(cid:173)
`mission/reception apparatus and method in a CDMA (Code
`Division Multiple Access) mobile communication system,
`and in particular, to a data transmission/reception apparatus
`and method suitable for high-speed data transmission requir(cid:173)
`ing an adaptive modulation and coding scheme.
`2. Description of the Related Art
`A mobile communication system has evolved from an
`early voice communication system that chiefly provides a
`voice service into a high-speed, high-quality radio data
`packet communication system that provides a data service
`and a multimedia service. Standardizations on HSDPA
`(High Speed Downlink Packet Access) and lxEV-DV (Evo(cid:173)
`lution Data and Voice) are separately made by 3GPP (3 rd
`Generation Partnership Project) and 3GPP2 (3 rd Generation
`Partnership Project 2) in an attempt to find out a solution for
`a high-speed, high-quality radio data packet transmission
`service of 2 Mbps or over in a 3rd generation mobile
`communication system. Meanwhile, a 4th generation mobile
`communication system is proposed to provide a high-speed,
`high-quality multimedia service superior to that of the 3rd
`generation mobile communication system.
`In radio communications, a principal factor of impeding
`the high-speed, high-quality data service lies in a channel
`environment. The radio channel environment is frequently
`changed due to a variation in signal power caused by white
`nose and fading, shadowing, Doppler effect caused by a
`movement of and a frequent change in speed of a UE (User
`Equipment), and interference caused by other users and a
`multipath signal. Therefore, in order to provide the high(cid:173)
`speed radio data packet service, there is a need for an
`improved technology capable of increasing adaptability to
`the variation in the channel environment in addition to the
`general technology provided for the existing 2nd or 3rd
`generation mobile communication system. A high-speed
`power control method used in the existing system also
`increases adaptability to the variation in the channel envi(cid:173)
`ronment. However, both the 3GPP and the 3GPP2, carrying
`out standardization on the high-speed data packet transmis(cid:173)
`sion system, make reference to AMCS (Adaptive Modula(cid:173)
`tion/Coding Scheme) and HARQ (Hybrid Automatic Repeat
`Request).
`The AMCS is a technique for adaptively changing a
`modulation scheme ( or technique) and a coding rate of a
`channel encoder according to a variation in the downlink
`channel environment. Commonly, a UE acquires channel
`quality information of the downlink by measuring a signal(cid:173)
`to-noise ratio (SNR), and transmits the channel quality
`
`5
`
`2
`information of the downlink to a Node B over an uplink. The
`Node B predicts a channel condition of the downlink chan(cid:173)
`nel based on the channel quality information of the down(cid:173)
`link, and designates a proper modulation scheme and coding
`rate based on the predicted value. The modulation schemes
`considered in the HSDPA and lx-EVDV include QPSK
`(Quadrature Phase Shift Keying), 8PSK (8-ary Phase Shift
`Keying), 16QAM (16-ary Quadrature Amplitude Modula(cid:173)
`tion) and 64QAM (64-ary Quadrature Amplitude Modula-
`10 tion), and the coding rates considered in the HSDPA and
`lx-EVDV include ½ and ¾. Therefore, an AMCS system
`applies the high-order modulation schemes (16QAM and
`64QAM) and the high coding rate ¾ to the UE having a
`good channel condition, and applies the low-order modula-
`15 tion schemes (QPSK and 8PSK) and the low coding rate ½
`to the UE having a poor channel condition. Commonly, a UE
`with a good channel condition is a UE located in the vicinity
`of a Node B, and a UE with a poor channel condition is a UE
`located in a boundary of a cell. Compared with the existing
`20 high-speed power control method, the AMCS decreases an
`interference signal, improving average system performance.
`The HARQ is a link control technique for correcting an
`error by retransmitting the errored data upon occurrence of
`a packet error at initial transmission. Generally, the HARQ
`25 is classified into Chase Combining (CC), Full Incremental
`Redundancy (FIR), and Partial Incremental Redundancy
`(PIR). The CC is a technique for transmitting a packet such
`that the whole packet transmitted at retransmission is equal
`to the packet transmitted at initial transmission. In this
`30 technique, a receiver combines the retransmitted packet with
`the initially transmitted packet. By doing so, it is possible to
`increase reliability of coded bits input to a decoder, thus
`resulting in an increase in the entire system performance.
`Combining the two same packets is similar to repeated
`35 coding in terms of effects, so it is possible to increase a
`performance gain by about 3 dB on the average. The FIR is
`a technique for transmitting a packet comprised of only the
`parity bits generated from the channel encoder instead of the
`same packet, thus to improve a coding gain of a decoder in
`40 the receiver. That is, the decoder uses the new parity bits as
`well as the initially transmitted information during decod(cid:173)
`ing, resulting in an increase in the coding gain. The increase
`in the coding gain improves performance of the decoder. It
`is well known in a coding theory that a performance gain by
`45 a low coding rate is higher than a performance gain by
`repeated coding. Therefore, the FIR is superior to the CC in
`terms of only the performance gain. Unlike the FIR, the PIR
`is a technique for transmitting a combined data packet of
`systematic bits and new parity bits at retransmission. The
`50 PIR obtains the similar effect to the CC by combining the
`retransmitted systematic bits with the initially transmitted
`systematic bits during decoding. Further, the PIR obtains the
`similar effect even to the FIR by performing decoding using
`the parity bits. The PIR has a coding rate slightly higher than
`55 that of the FIR, showing medium performance between the
`FIR and the CC. However, the HARQ should be considered
`in the light of not only the performance but also the system
`complexity such as a buffer size and signaling of the
`receiver, so it is not easy to determine which HARQ
`60 technique best applies.
`The AMCS and the HARQ are separate techniques for
`increasing adaptability to the variation in the link environ(cid:173)
`ment. However, it is possible to greatly improve the system
`performance by combining the two techniques. That is, if a
`65 modulation scheme and a coding rate proper for a downlink
`channel condition by the AMCS, then data packets corre(cid:173)
`sponding thereto are transmitted.
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 11 of 23
`
`

`

`US 7,016,658 B2
`
`3
`FIG. 1 illustrates a structure of a conventional transmitter
`for high-speed packet data transmission. Referring to FIG. 1,
`a channel encoder 10 can realize AMCS and HARQ under
`the control of a controller 18. The channel encoder 10 is
`comprised of an encoder and a puncturer. If data proper to
`a data rate is applied to an input terminal of the channel
`encoder 10, the encoder performs encoding and provides the
`coded bits to a channel interleaver 14, in order to reduce a
`transmission error rate. The channel interleaver 14, a device
`for coping with a fading channel, separates bits constituting
`particular information ( e.g., one word of a voice signal) from
`one another as far as possible, thereby decreasing a prob(cid:173)
`ability that the information will be lost at the same time. The
`interleaved signal is modulated into a symbol by a modu(cid:173)
`lator 16 before being transmitted. A receiver then performs
`error decision on a received packet and informs the trans(cid:173)
`mitter of the error decision result. If there is no error, the
`transmitter transmits a new packet. Otherwise, if there is an
`error, the transmitter retransmits the previously transmitted
`data. For the retransmission, the transmitter may transmit the
`same transmission data as initially transmitted data accord(cid:173)
`ing to the CC of the HARQ, or transmit new channel-coded
`data according to the FIR or PIR of the HARQ. In the next
`generation mobile communication system, a more powerful
`coding technique is required for reliable transmission of 25
`high-speed multimedia data. A turbo encoder is a typical
`example of the channel encoder 10. It is known that a
`channel coding technique using the turbo encoder shows
`performance most approximative to the Shannon limit in
`light of a bit error rate (BER) even at a low SNR. This
`channel coding technique is adopted for the HSDPA and the
`lxEV-DV by the 3GPP and the 3GPP2.
`An output of the turbo encoder can be divided into
`systematic bits and parity bits. The systematic bits mean
`actual data to be transmitted, and the parity bits mean a 35
`parity signal added to correct an error generated during
`transmission at the receiver. Though not illustrated in FIG.
`1, the channel encoder 10 includes a puncturer in a CDMA
`mobile communication system. The puncturer selectively
`punctures the systematic bits or parity bits among the output 40
`of the channel encoder 10, thereby satisfying the determined
`coding rate and demodulation order.
`An operation of the channel encoder 10 will be described
`in detail. An input signal applied to the channel encoder 10
`is output as a stream X of systematic bits. A first internal
`encoder of the channel encoder 10 encodes the input signal,
`and outputs two different streams Yl and Y2 of parity bits.
`The input signal is also provided to an internal interleaver of
`the channel encoder 10. A signal interleaved by the internal
`interleaver is output as a stream X' of interleaved systematic 50
`bits, and at the same time, provided to a second internal
`encoder of the channel encoder 10. The second internal
`encoder encodes the interleaved signal and outputs two
`different streams Zl and Z2 of parity bits. The streams X and
`X' of systematic bits, and the streams Yl, Y2, Zl and Z2 of
`parity bits are provided to a puncturer in the channel encoder
`10. The puncturer punctures the streams X and X' of
`interleaved systematic bits, and the different streams Yl, Y2,
`Zl and Z2 of parity bits using a puncturing pattern selected
`by a control signal from the controller 18, thereby outputting 60
`only desired systematic bits and parity bits. The puncturing
`pattern used in the puncturer is provided from a puncturing
`pattern generator. The puncturing pattern depends upon a
`coding rate and the HARQ type. That is, if the HARQ type
`is CC, the puncturer punctures the coded bits such that the 65
`systematic bits and the parity bits have a fixed combination
`according to a prescribed coding rate, so the transmitter can
`
`4
`transmit the same packet at each transmission. However, if
`the HARQ type is IR (Incremental Redundancy), the punc(cid:173)
`turer punctures the coded bits using a combination of the
`systematic bits and the parity bits at initial transmission, and
`5 determines whether to include the systematic bits at retrans(cid:173)
`mission according to whether the IR is PIR or FIR. How(cid:173)
`ever, the puncturer may puncture the coded bits using
`various combinations of the systematic bits no matter
`whether the IR is PIR or FIR, thereby increasing the entire
`10 coding gain.
`The systematic bits and the parity bits output from the
`channel encoder 10 are applied to the interleaver 14. The
`interleaver 14 interleaves coded bits comprised of the sys(cid:173)
`temic bits and the parity bits. Therefore, the systematic bits
`15 and the parity bits are combined into one bit stream. The
`stream of the interleaved coded bits is applied to the modu(cid:173)
`lator 16. The modulator 16, under the control of the con(cid:173)
`troller 18, modulates the stream of coded bits by a prescribed
`modulation scheme and outputs modulation symbols. The
`20 modulation symbols output from the modulator 16 are
`distributed by a transmission antenna assigner 20 to a
`plurality of antennas constituting an antenna array. The
`distributed modulation symbols are transmitted through the
`associated antennas.
`FIG. 2 illustrates a structure of a receiver corresponding
`to the transmitter described in conjunction with FIG. 1.
`Referring to FIG. 2, modulation symbols are received
`through a plurality of reception antennas constituting one
`antenna array, and the modulation symbols received through
`30 the associated antennas are provided to a channel estimation
`and antenna data classification block 48. The channel esti-
`mation and antenna data classification block 48 multiplexes
`the modulation symbols received through the reception
`antennas into one stream of modulation symbols. The stream
`of the modulation symbols is provided to a demodulator 50,
`and the demodulator 50 demodulates the stream of modu(cid:173)
`lation symbols into a stream of coded bits by a modulation
`scheme corresponding to the modulation scheme used in the
`transmitter. The stream of coded bits are provided to a
`deinterleaver 54, and the deinterleaver 54 deinterleaves the
`stream of coded bits according to the interleaving pattern
`used in the transmitter. The stream of the deinterleaved
`coded bits is provided to a channel decoder 56, and the
`channel decoder 56 decodes the stream of the deinterleaved
`45 coded bits under the control of a controller 58 and outputs
`the decoded data stream as received data.
`Commonly, in the case where errors occur in transmission
`data at a prescribed rate in a transmitter and a receiver for
`high-speed packet data transmission, errors generated in
`systematic bits exert more influence on entire performance
`of the mobile communication system, compared with errors
`generated in parity bits. Therefore, assuming that the same
`error rate is maintained as a whole, if the errors generated in
`the parity bits are larger in number than the error generated
`55 in the systematic bits, the receiver can perform decoding
`more accurately. That is, the systematic bits have more
`influence on the decoder compared with the parity bits. The
`reason is because the parity bits are redundant coded bits
`added to correct transmission errors during decoding.
`The interleaver 14 in the transmitter of the conventional
`mobile communication system performs symbol interleav(cid:173)
`ing regardless of priority ( or importance) of the systematic
`bits and the parity bits. In other words, the conventional
`transmitter mixes the systematic bits and the parity bits,
`segments the mixed data bits according to transmission
`antennas of an antenna array, and transmits the segmented
`data bits through the associated transmission antennas. In
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page 12 of 23
`
`

`

`5
`this case, the transmission antennas have different transmis(cid:173)
`sion capabilities. Therefore, if a particular transmission
`antenna has a poor transmission capability, the systematic
`bits and the parity bits have a similar error rate, affecting the
`entire system performance. This means that the system 5
`performance becomes worse than when errors occur only in
`the parity bits. Therefore, there is a demand for a technique
`for decreasing a probability that errors will occur in sys(cid:173)
`tematic bits by taking into consideration a channel condition
`for the signals transmitted through the transmission anten- 10
`nas, thereby increasing the entire system performance.
`Further, in a mobile communication system performing
`data transmission and reception using multiple antennas, in
`the case where transmission antennas have a similar channel
`condition, even though the transmission data is separated
`into systematic bits and parity bits before being transmitted,
`a performance gain may not occur. In this case, it is possible
`to improve system performance by assigning ( or mapping)
`the systematic bits to the bits corresponding to positions
`more resistive to an error among the bits constituting a 20
`symbol and assigning the parity bits to the bits correspond(cid:173)
`ing to positions relatively susceptible to an error, during
`modulation.
`However, the above-stated techniques for improving per(cid:173)
`formance of the mobile communication system have been
`used separately only. That is, in a mobile communication
`system using multiple antennas, there is not a case where a
`channel condition for each transmission antenna is applied
`using both techniques.
`The conventional HARQ and AMCS techniques have
`contributed to an increase in entire system performance in
`high-speed packet communications. In addition, many
`attempts are still being made for an improved method. For
`example, there has been proposed a method for changing a
`level of the AMCS when a condition of a reception channel
`is changed during retransmission. That is, it is necessary to
`select an optimal transmission method according to a chan(cid:173)
`nel condition at initial transmission and retransmission.
`In addition, there has been proposed a method for increas- 40
`ing a data rate by increasing the number of transmission/
`reception antennas used in Node Bs and UEs. In this case,
`since the transmission antennas have different transmission
`characteristics, future studies should be made into a trans(cid:173)
`mission method considering the different transmission char- 45
`acteristics.
`
`SUMMARY OF THE INVENTION
`
`When a plurality of transmission/reception antennas are
`used for data transmission, a channel condition for each
`antenna is changed over time. A difference of the channel
`characteristic or channel condition between the antennas a
`diversity. As a result, for data transmission through each
`antenna, several transmission methods depending on the
`channel condition are required. As circumstances require, a
`transmission condition of the transmission/reception anten(cid:173)
`nas may be determined such that it is possible to transmit
`data by simply separating the data into the systematic bits
`and the parity bits. However, in some cases, the transmis- 60
`sion/reception antennas have a similar transmission condi(cid:173)
`tion, so it is not possible to determine priority of transmis(cid:173)
`sion/reception antennas. In this case, it is possible to
`improve the entire system performance through a method of
`distinguishing only priority of the bits constituting a symbol 65
`and separately mapping the systematic bits with high prior-
`ity and the parity bits with low priority.
`
`US 7,016,658 B2
`
`6
`Accordingly, 1t 1s necessary to estimate cases where a
`transmission condition of multiple transmission/reception
`antennas is diversified, and design a system that can be
`flexibly adapted to each of the cases.
`It is, therefore, an object of the present invention to
`provide a new data transmission/reception apparatus and
`method for improving entire system performance of a
`CDMA mobile communication system with an antenna
`array.
`It is another object of the present invention to provide an
`apparatus and method for classifying transmission data
`according to how much the transmission data affects data
`reception performance, based on the fact that channels have
`different transmission conditions, and thereby transmitting
`15 different data through multiple transmission antennas.
`It is further another object of the present invention to
`provide an apparatus and method for transmitting transmis(cid:173)
`sion data bits through antennas having different channel
`environments according to priority.
`It is yet another object of the present invention to provide
`an apparatus and method for transmitting coded bits with
`high priority among transmission data bits through an
`antenna having a good channel condition.
`It is still another object of the present invention to provide
`25 an apparatus and method for transmitting coded bits with
`low priority among transmission data bits through an
`antenna having a poor channel condition.
`It is still another object of the present invention to provide
`an apparatus and method for mapping transmission data bits
`30 to positions with different reliabilities of a symbol according
`to priorities of the data bits, and properly distributing the
`mapped data bits to antennas having different channel con(cid:173)
`ditions before transmission.
`It is still another object of the present invention to provide
`35 a data transmission/reception apparatus and method for
`optimally adapting transmission data to a time-variant chan(cid:173)
`nel environment during modulation based on a position of
`data bits mapped to a symbol in a CDMA mobile commu-
`nication system with an antenna array.
`According to a first aspect of the present invention, there
`is provided a method for providing first and second inter(cid:173)
`leaved bit streams to a modulator in order to transmit the first
`and second interleaved bit streams through at least two
`antennas in a mobile communication system including an
`encoder for encoding a transmission data stream at a given
`coding rate into a first bit stream with first priority and a
`second bit stream with second priority being lower than the
`first priority, an interleaver for interleaving the first and
`second bit streams and generating the first and second
`50 interleaved bit streams, and the modulator for modulating
`the first and second interleaved bit streams by a given
`modulation scheme. The method generates a combination of
`at least one of a first combination bit streams representing a
`combination of bits from the first interleaved bit stream, a
`55 second combination bit streams representing a combination
`of bits from the second interleaved bit stream, and a third
`combination bit streams representing a combination of bits
`from the first interleaved bit stream and the second inter-
`leaved bit stream according to power condition information
`of the respective antennas. The number of bits in each of the
`first, second and third combination bit streams is determined
`according to the modulation scheme.
`According to a second aspect of the present invention,
`there is provided a method for providing first and second
`interleaved bit streams to a modulator in order to transmit
`the first and second interleaved bit streams through at least
`two antennas in a mobile communication system including
`
`IPR2022-00833
`CommScope, Inc. Exhibit 1024
`Page