WO2007137490A1 - Procédé d'émission et de réception de signaux d'un système mimo et appareil correspondant - Google Patents

Procédé d'émission et de réception de signaux d'un système mimo et appareil correspondant Download PDF

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Publication number
WO2007137490A1
WO2007137490A1 PCT/CN2007/001572 CN2007001572W WO2007137490A1 WO 2007137490 A1 WO2007137490 A1 WO 2007137490A1 CN 2007001572 W CN2007001572 W CN 2007001572W WO 2007137490 A1 WO2007137490 A1 WO 2007137490A1
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Prior art keywords
signals
antenna
transform
signal
receiving
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PCT/CN2007/001572
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English (en)
Chinese (zh)
Inventor
Bin Li
Linfeng Xia
Shengrong Feng
Yinggang Du
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Huawei Technologies Co., Ltd.
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Priority claimed from CN2006100919702A external-priority patent/CN101056162B/zh
Priority claimed from CN2006100939015A external-priority patent/CN101060356B/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007137490A1 publication Critical patent/WO2007137490A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to multiple input multiple outputs (Multiple Input Multiple Outputs)
  • MIMO Multiplex-to-Reliable and Low-Reliable Communication
  • WLAN Wireless Local Area Network
  • a MIMO system has twice the system capacity than a conventional antenna system, and signals are transmitted and received through multiple antennas at the transmitting end and the receiving end, thereby improving the quality of service for each user, for example, bit error rate or data rate.
  • the conventional communication system uses a single-input and single-input (SISO) antenna system.
  • SISO single-input and single-input
  • MISO Multiple-Inputs and Single-Output
  • SIMO Single-Input and Multiple-Outputs
  • Space-time coding is the basis of MIMO systems, and next-generation wireless communication systems are planned to adopt spatio-temporal processing. People are also constantly proposing new or improved space-time codes (Space-Time Coding, referred to as The "STC" method improves the performance of the MMO system, reduces the complexity of the space-time coding system, and is better suited to the requirements of the new generation wireless communication system and the actual situation of the channel.
  • STC Space-Time Coding
  • STC technology is an important topic. It utilizes two-dimensional coding of time and space to maximize the transmission rate in wireless channels to meet the technical requirements of next-generation wireless communication.
  • the general structure of STC technology is shown in Figure 1. .
  • the physical essence of STC technology lies in: using the orthogonal or quasi-orthogonal characteristics existing between the airspace and the time domain, according to a design criterion, the coding redundancy information is mapped as evenly as possible to the space-time two-dimensional plane to weaken the wireless multipath.
  • STC mainly includes the following four categories: Layered Space-Time Coding (abbreviation)
  • LSTC Space-Time Block Coding
  • STBC Space-Time Block Coding
  • STTC Space-Time Trellis Coding
  • STTC Space-Time Trellis Coding
  • Turbo space-time code. More complex STC The scheme is various cascade structures of the above-mentioned types of STCs, and the implementation complexity and performance of various types of STCs are different.
  • antenna diversity techniques are applied to both the transmitting end and the receiving end of the MMO system to reduce the correlation of the transmission path to achieve higher channel capacity.
  • antenna diversity techniques process signals received from a plurality of spatially uncorrelated receiving antennas that are transmitted from the transmitting end and propagated through different paths. Therefore, antenna diversity is simultaneously received by antenna diversity. The probability of a signal with severe fading distortion is small, which can effectively improve the transmission quality of the signal, and the anti-channel fading of the 4th.
  • the "Alamouti" space-time code is a simple and effective space-time coding applied to two transmit antennas and multiple receive antennas. As shown in Figure 2, the code rate is 1 and the full diversity effect is achieved, as shown in Figure 3. Among them, the full diversity effect, that is, the diversity degree is the number of transmitting antennas 2; the code rate is defined as the ratio of the number of symbol symbols to the number of transmitting slots.
  • the STC adopts the "Alamouti" space-time code.
  • the code rate of the transmitting antenna can be 1 and the effect of full diversity can be achieved.
  • data 8 and S 2 * are respectively transmitted in two symbol symbols of the antenna 1
  • data S 2 and -Sj* are respectively transmitted in two symbol symbols of the antenna 2, where S!* is Si conjugated, S 2 * S 2 is conjugated.
  • orthogonal space-time codes When the number of antennas is 4, orthogonal space-time codes are usually used in the prior art. Orthogonal space-time codes can achieve full diversity, but the code rate is 3/4.
  • the above solution has the following problem: for four or more transmit antennas, the full diversity code rate is less than one.
  • the embodiments of the present invention provide a method for transmitting and receiving signals of a multiple input multiple output system and a device thereof, so that the code rate of the full diversity is not less than 1 for four or more transmit antennas.
  • an embodiment of the present invention provides a signal transmission method for a multiple input multiple output system, in which a transmitting end transmits signals by two groups of KM group antennas, where K and ⁇ are integers greater than 0 and ⁇ >1
  • the method includes:
  • Two transform results are obtained from two parallel signals to be transmitted by linear transformation, and two transform results are reorganized into two groups into KM result groups; two transform results in each result group include 2KM a linear combination of signals;
  • the KM result groups are respectively coded with a double antenna space-time code with a code rate of 1;
  • the encoded signals of the KM result sets are respectively transmitted through the KM group antenna, and each round is simultaneously transmitted by the K group antenna.
  • the embodiment of the invention further provides a signal receiving method for a multiple input multiple output system, wherein the signal is transmitted by using two groups of KM group antennas, wherein K is the number of antenna groups simultaneously transmitted, and K and ⁇ are greater than An integer of 0 and ⁇ >1; the number of receiving antennas is not less than ⁇ ; the method includes:
  • the embodiment of the present invention further provides a signal input device for a multiple input multiple output system, comprising: a KM group antenna of two groups, KM coding modules and a transform unit corresponding to each group of antennas, where M is greater than An integer of 0 and KM>1, where:
  • a transform unit for obtaining 2KM by 2KM parallel signals to be transmitted by linear transformation Transforming the result, and outputting to 1 coding module as 2 sets of 2 transform results; 2 transform results in each set include linear combination of 2KM parallel signals;
  • KM coding modules for encoding the input two conversion results with a dual antenna space-time code with a code rate of 1;
  • the KM group antenna is used for transmitting signals encoded by the corresponding coding module, and each round is simultaneously transmitted by the K group antennas.
  • the embodiment of the invention further provides a signal receiving device for a multiple input multiple output system, wherein the signal is transmitted by using two groups of KM group antennas, wherein K is the number of antenna groups simultaneously transmitted, and K and ⁇ are greater than An integer of 0 and ⁇ >1; the device includes at least one receive antenna, and:
  • a serial transfer module for converting 2 ⁇ received signals detected by the receiving antenna within 2 ⁇ symbol symbols into parallel received signals and outputting to the signal recovery unit;
  • a signal recovery unit configured to perform linear transformation according to the received signal before transmission and dual antenna space-time code coding with a code rate of 1, and obtain two parallel signals from the two received signals.
  • An embodiment of the present invention further provides a signal receiving apparatus for a multiple input multiple output system, wherein the signal is transmitted in turn by two groups of two groups of antennas, wherein ⁇ is an integer greater than one; 1 receiving antenna, and:
  • a decoding module configured to decode two received signals detected in each of the two symbol symbols into two decoding results; and the decoding is performed according to a dual antenna space-time code with a code rate of 1 before the receiving of the received signal;
  • the signal inverse transform unit is configured to obtain two parallel signals from the two decoding results of the decoding according to the linear transformation performed before the transmission of the received signal.
  • two transform results are obtained by linear transformation from two parallel signals to be transmitted, and two transform results are reorganized into two groups into KM result groups, and the KM result groups are coded at a rate of one.
  • Dual antenna space-time code coding transmitted on the KM group antenna. Because the 2KM signals to be sent are linearly transformed and recombined into KM groups for encoding, and finally sent to KM for antenna transmission, each signal is transmitted via 2KM antennas, with full diversity effect and good transmission performance. And transmitting in the M round by K to the antenna, the code rate is not less than 1.
  • FIG. 1 is a general structural diagram of an STC technique of a MIMO system in the prior art
  • 2 is a schematic diagram of an "Alamouti" space-time code scheme of a MIMO system in the prior art
  • FIG. 3 is a schematic diagram of an "Alamouti" space-time code according to the MIMO system shown in FIG. 2 in the prior art
  • FIG. 4 is a flowchart of a signal transmission method of a MIMO system according to a first embodiment of the present invention
  • FIG. 5 is a schematic diagram of a transmission scheme of a 4-antenna system according to a first embodiment of the present invention
  • FIG. 7 is a flowchart of a MIMO system signal transmission method according to a second embodiment of the present invention
  • FIG. 8 is an STC scheme of an 8-antenna system according to a second embodiment of the present invention
  • FIG. 9 is a schematic diagram of an STC of an 8-antenna system according to a second embodiment of the present invention shown in FIG. 8.
  • FIG. 10 is a flowchart of a MIMO system signal receiving method according to a third embodiment of the present invention
  • FIG. 12 is a structural diagram of a signal transmitting apparatus of a MIMO system according to a fourth embodiment of the present invention
  • FIG. 13 is a signal receiving apparatus of a MIMO system according to a fifth embodiment of the present invention
  • FIG. 14 is a flowchart of a MIMO system signal transmitting method according to a sixth embodiment of the present invention
  • FIG. 15 is a sixth aspect of the present invention.
  • FIG. 16 is a flowchart of a MIMO system signal receiving method according to a seventh embodiment of the present invention
  • FIG. 17 is a structural diagram of a MIMO receiver according to a ninth embodiment of the present invention;
  • FIG. 18 is a structural diagram of a MIMO receiver according to a thirteenth embodiment of the present invention.
  • FIG. 19 is a flowchart of a transmission method of a MIMO system according to a sixteenth embodiment of the present invention
  • FIG. 20 is a schematic diagram of a transmission scheme of a four-antenna system according to a sixteenth embodiment of the present invention
  • FIG. STC diagram of a four-antenna system of a sixteenth embodiment of the present invention
  • Figure 22 is a flowchart of a signal transmission method of a MIMO system according to a seventeenth embodiment of the present invention
  • Figure 23 is a schematic diagram of an STC scheme of a four-antenna system according to a seventeenth embodiment of the present invention
  • FIG. 25 is a schematic diagram of an STC scheme of an 8-antenna system according to an eighteenth embodiment of the present invention
  • FIG. 26 is an eighth embodiment of the eighteenth embodiment of the present invention shown in FIG. STC diagram of the antenna system;
  • FIG. 27 is a flowchart of a method for transmitting a MIMO system signal according to a nineteenth embodiment of the present invention
  • FIG. 28 is a schematic diagram of an STC scheme of an 8-antenna system according to a nineteenth embodiment of the present invention
  • FIG. 29 is a structural diagram of a MIMO system signal transmitting apparatus according to a twentieth embodiment of the present invention
  • FIG. 30 is a twentieth according to the present invention.
  • Figure 31 is a structural diagram of a signal receiving apparatus of a MIMO system according to a twenty-fifth embodiment of the present invention.
  • the embodiment of the present invention provides a space-time coding scheme for four or more transmit antennas with a code rate of not less than 1 and full diversity.
  • a transform result is obtained by a linear transform from a signal to be transmitted, and the transform result is obtained.
  • Two groups are combined and encoded by a pair of antennas with a code rate of 1 and then output by K to the antenna.
  • decoding and inverse transform corresponding to the transmitting end are used to obtain the transmitted signal.
  • the MIMO system signal transmission method according to the first embodiment of the present invention is as shown in FIG.
  • 2N transmit antennas 2N antennas are divided into 1 groups into N groups, where N is an integer greater than 1.
  • N 2N transmit antennas
  • 4 transmit antenna antennas 1 and 2 are a group
  • antenna 3 and antenna 4 are a group.
  • the STC scheme of the MIMO system adopts orthogonal transform and "Alamouti" space-time code as shown in Fig. 5. Show.
  • step 401 the transmitting end of the MIMO system converts four (2N) serial signals in the serial signal stream to be transmitted, for example, signals Xi, X 2 , X 3 and X 4 , after serial-to-parallel conversion.
  • the corresponding four parallel signals are obtained, and the subsequent signals are equally converted every four to obtain a parallel signal stream.
  • the present invention is applied to the transmission of a serial signal stream by serial transfer.
  • step 402 the parallel signal stream four parallel signals are converted into two groups, for example, and for the first group 2, X 3, X 4 of the second group.
  • step 403 the signals of the two transform groups are linearly transformed, and each transform group is generated.
  • the linear transformation performed may be an orthogonal transform, such as a Fast Fourier Transform ("FFT"), a Hadamard Transform, and a metamorphosis.
  • FFT Fast Fourier Transform
  • a Hadamard Transform a Hadamard Transform
  • metamorphosis a metamorphosis
  • step 404 the four transformation results obtained by the signals of the two transformation groups are reorganized into two result groups by two groups, and that 8 1 and 8 2 form a first result group, and S 3 and S 4 constitute a group.
  • Two result groups The principle of recombination is that the two transformation results in each result group are required to come from different transformation groups.
  • step 405 the two result sets are respectively encoded with a two-antenna space-time code of code rate 1, for example, an "Alamouti" space-time code.
  • the two sets of transmit antennas respectively transmit the signals encoded by the double-antenna space-time code of the code rate of 1 in the two result sets, wherein each set of antennas continuously transmits 2 symbol symbols.
  • the STC output by the four transmitting antennas is as shown in Fig. 6. Since the first result set encoded signal and the second result set encoded signal are transmitted in different antenna groups and at different times, they do not interfere with each other. Only one pair of antennas transmits the signal encoded by the "Alamouti" space-time code in each time period, so that the code rate of the full diversity of the "Alamouti" space-time code is 1 and the code word is orthogonal.
  • the MIMO system signal transmission method is as shown in FIG. 7.
  • the antenna 5 and the antenna 6 are a group, and the antenna 7 and the antenna 8 are a group.
  • the STC scheme of the MIMO system is as shown in FIG. 8 when orthogonal transform and "Alamouti" space-time code are employed.
  • step 701 the transmitting end of the MIMO system converts 8 (2N) serial signals in the serial signal stream to be transmitted, for example, signals ⁇ , X 2 , ... X 8 , after serial-to-parallel conversion. Get the corresponding 8 Parallel signals, the subsequent signals are equally converted every 8 to obtain a parallel signal stream.
  • the present invention is applied to the transmission of a serial signal stream by serial transfer.
  • step 702 the eight parallel signals in the parallel signal stream are equally divided into two transform groups, for example,
  • Xi, X 2 , X 3 and X 4 are the first group, and X 5 , X 6 , X 7 and X 8 are the second group.
  • step 703 the signals of the two transform groups are linearly transformed, and each transform group is generated.
  • the conversion result of the first group of signals, X 2 , X 3 and X 4 is Si, S 3 ,
  • the linear transformation performed may be an orthogonal transform, such as an FFT, a Hada code transform, or the like.
  • S 2 are the results of a first group consisting of, S 3 and S 4 Composition
  • the second result set, S 5 and s 6 constitute a third result set, and s 7 and s 8 form a fourth result set.
  • the principle of recombination is that the two transformation results in each result group are required to come from different transformation groups.
  • step 705 the four result sets are respectively encoded with a two-antenna space-time code of a code rate of 1, for example, an "Alamouti" space-time code.
  • step 706 the four sets of transmit antennas respectively transmit the signals encoded by the double-antenna space-time code of the code rate of 1 in the four result sets, wherein each set of antennas continuously transmits two symbol symbols.
  • the STC output by these 8 transmit antennas is shown in Figure 9.
  • the coded signals of the different result sets are transmitted in different antenna groups and at different times, and therefore do not interfere with each other.
  • the signal transmitting end includes N sets of transmitting antennas in a group of two, and the number of transmitting antenna groups is 1 at the same time, and the number of receiving antennas at the receiving end is 1.
  • step 1001 when the receiving end of the MIMO system receives the signal, the signal received in the two symbol symbols is correspondingly decoded by the dual antenna space-time code with the code rate of 1 used by the transmitting end, for example, "Alamouti""Time and space code.
  • Two signals are obtained per decoding. For example, when receiving signals from antenna 1 and antenna 2 (including two consecutive symbols), decoding results in 8 1 and 8 2 ; signals from antenna 3 and antenna 4 are received (including two consecutive symbols) At the time, decoding results in S 3 and S 4 .
  • step 1002 the 2N signals obtained by successive N decodings are equally divided into two groups, and the N signals in each group are respectively derived from N different decoding results.
  • N is an integer greater than one.
  • the decoding is performed twice to obtain 4 signals, which are divided into 2 groups, the first group is 8 1 And 8 3 , the second group is S 2 and S 4 .
  • step 1003 an inverse transform corresponding to the linear transformation of the transmitting end is performed for each of the N signals in each group, and N transform results are obtained for each group.
  • the linear transformation at the transmitting end is an orthogonal transform, for example, an FFT, a Hada transform or a cosine transform
  • step 1004 the two sets of transform results are combined into 2N parallel signal outputs.
  • step 1005 2N parallel signals are converted to a serial signal stream output.
  • the MIMO system signal transmitting apparatus includes N sets of antennas of two groups, and N coding modules 1231 and 1232 corresponding to N sets of antennas up to 123N.
  • the serial conversion module 1210 and the transform unit 1220 include two linear transform modules 1221 and 1222, where N is an integer greater than one.
  • the serial-to-transfer module 1210 is configured to convert the serial signal stream to be transmitted into 2N parallel signals, and divide them into two groups and output them to two linear transform modules 1221 and 1222, respectively.
  • the group signal is linearly transformed into N transform results and output to N coding modules 1231, 1232 to 123N, respectively, and then these transform results are encoded by each coding module with a two-antenna space-time code with a code rate of 1, and output to the corresponding 1 set of antennas; the N sets of antennas transmit signals from corresponding coding modules in turn.
  • the codewords output to each group of antennas are orthogonal, and the corresponding inverse transform is easily implemented, so that the structure of the receiving device can be relatively simple;
  • the antenna space-time code can be the "Alamouti" space-time code. Because the 2N signals to be sent are linearly transformed, and reorganized into N groups for "Alamouti" space-time code encoding, and finally sent to a pair of antennas, each signal is transmitted via 2N antennas, with 2N antennas. Full score Set effect, good transmission performance.
  • the transform unit 1220 includes two linear transform modules 1221 and 1222.
  • the basic function of the two linear transform modules is that each input signal can be distributed to each antenna for linear transmission after being transformed by the transform unit 1220. It can be understood that the same effect can be achieved if the transform unit 1220 linearly transforms all 2N signals together using only one linear transform module.
  • the MIMO system signal receiving apparatus is configured as shown in FIG. 13 and is configured to receive 2N transmit antennas and a transmission signal having a code rate of 1.
  • the receiving apparatus includes an antenna, a decoding module 1310, and two linear transform modules. 1321 and 1322, and a parallel-to-serial module 1330.
  • the decoding module 1310 is configured to decode each of the two received signals received by the antenna with an "Alamouti" space-time code to obtain two signals, which are respectively output to the linear transform modules 1321 and 1322.
  • the decoding module 1310 decodes the signal received by the antenna, and the N decoding results are collected and then inversely transformed by the two linear transform modules 1321 and 1322 respectively; and each linear transform module performs linearity with the transmitting end for the N input signals. Transform the corresponding inverse transform to obtain a signal output.
  • the 2N parallel signals output by the two linear transform modules 1321 and 1322 are converted to a serial signal output by the parallel-to-serial module 1330.
  • the linear transformation may be an orthogonal transformation.
  • two linear transform modules are used, the basic function of which is to cause the receiving device to perform a packet linear transformation inverse to the transmitting end of the received signal. It can be understood that if the receiving signal transmitting end linearly transforms all 2N signals, the receiving device in this embodiment can obtain the corresponding 2N parallel signals by using only one linear transform module.
  • FIGs. 14 and 15 A four-antenna MMO system signal transmitting method according to a sixth embodiment of the present invention is shown in Figs. 14 and 15.
  • the sixth embodiment is similar to the first embodiment except that the first embodiment employs two transform groups for linear transformation, and the sixth embodiment performs linear transformation with only one transform group.
  • step 1401 is similar to step 401 of the first embodiment
  • step 1403 is similar to step 405
  • step 1404 is similar to step 406, and details are not described herein again.
  • step 1402 the four parallel signals generated after the serial-to-parallel conversion are linearly transformed to generate four signals, and the two signals are grouped into two result groups, so that the code rate is 1 in step 1403.
  • Antenna space-time code coding is antenna space-time code coding.
  • the STC scheme of the MIMO system in this embodiment adopts orthogonal transform and "Alamouti" space-time
  • the code time is shown in Figure 15.
  • FIG. 7 A signal receiving method for a 4-antenna MIMO system according to a seventh embodiment of the present invention is shown in FIG.
  • the seventh embodiment corresponds to receiving the signal transmitted by the sixth embodiment.
  • step 1601 the receiving end decodes the received signal (including 2 consecutive symbols) of the "Alamouti" space-time code to obtain two signals. Four signals can be obtained by two consecutive decodings.
  • step 1602 the four signals obtained by the two consecutive decodings are subjected to linear inverse transformation, and the manner of the linear inverse transformation is opposite to the manner of linear transformation in the sixth embodiment, and the purpose is to recover from the four signals obtained by decoding.
  • the linear transformation can be an orthogonal transformation, and the use of orthogonal transformation can suppress noise and improve signal quality.
  • step 1603 the four parallel signals obtained by the linear transformation are converted into serial signal outputs.
  • the eighth embodiment of the present invention is a receiving method in which four transmitting antennas and one receiving antenna, the code rate is 1, and the transmitting end encodes with an "Alamouti" space-time code, and can be used to receive the signal transmitted by the first embodiment.
  • the channel parameters corresponding to four transmit antennas and one receive antenna are (h x , h 2 , h tripodh, )
  • the received signals ⁇ , r 2 , r 3 , r 4 in the four symbol symbols can represent for:
  • / , « 3 , /7 4 are the noise sample values within the four symbol symbols, respectively, assuming a Gaussian distribution with zero mean and the same variance 2 .
  • the above formula can be further expressed as:
  • the detection of the signal is:
  • a ninth embodiment of the present invention is a single receiving antenna MMO receiver for encoding a 4 transmitting antenna, a code rate of 1, and a transmitting end using an "Alamouti" space-time code, and its structure is as shown in FIG. Inputting the signal sequence in the symbol symbol received from the receiving antenna, ⁇ , ... into the serial and module
  • the parallel receiving signals outputted by the serial and module 1710 are input to the conjugate processing module 1721, and r 2 and r 4 having an even number in the parallel received signals are conjugated, and the serial number is maintained as an odd number, and r 3 is unchanged.
  • the matrix multiplication module 1723 multiplies the matrix C by the vector R to obtain the detection result.
  • the matrix multiplication module 1723 outputs four sets of parallel signals. If serial results are required, a parallel and serial module can be added after the matrix multiplication module 1723.
  • the conjugate processing module 1721 the matrix calculation module 1722, and the matrix multiplication module
  • a signal recovery unit 1720 can constitute a signal recovery unit 1720 to recover the received signal detected in each symbol symbol. For parallel signals.
  • a tenth embodiment of the present invention is a receiving method in which eight transmitting antennas and one receiving antenna, the code rate is 1, and the transmitting end encodes with an "Alamouti" space-time code, and can be used to correspondingly receive the signal transmitted by the second embodiment.
  • the channel parameters corresponding to eight transmit antennas and one receive antenna are (h x , /? 2 , ⁇ 3 , ⁇ 4 , /? 5 , ⁇ 6 , /? 7 , )
  • the received signals r tokenr 2 , r 3 , r , r 5 , r 6 , r 7 , r 8 can be expressed as:
  • noise sample values in the eight symbol symbols are assumed to be Gaussian distribution, zero mean and the same variance 0 ".
  • the above equation can be further expressed as:
  • the detection of the signal is:
  • the eleventh embodiment of the present invention is a single receive antenna MIMO receiver for encoding 8 transmit antennas, a code rate of 1, and a transmit end using an "Alamouti" space-time code.
  • the structure is similar to that of FIG. 17, except that the parallel transmission signals between the modules are 8 instead of 4.
  • the signal sequence in the symbol symbol received from the receiving antenna, ⁇ ⁇ , ... is input to the serial to the module, and the 8 groups are serially connected. Switch to parallel.
  • the parallel receiving signals outputted by the serial and module are input to the conjugate processing module, and r2, r4, r6, r8 with the even number of the parallel received signals are conjugated, and the rl, r3, r5 with the odd number are maintained.
  • R7 does not change
  • the matrix C is also output to the matrix multiplication module.
  • the matrix multiplication module multiplies the matrix C by the vector R to obtain the detection result.
  • the matrix multiplication module outputs eight sets of parallel signals. If serial results are required, a parallel and serial module can be added after the moment P multiply the module.
  • the conjugate processing module, the matrix calculation module, and the matrix multiplication module may constitute a signal recovery unit, and restore the received signals detected in the respective symbol symbols to parallel signals.
  • a twelfth embodiment of the present invention is a receiving method in which four transmitting antennas and one receiving antenna, the code rate is 1, and the transmitting end encodes with an "Alamouti" space-time code, and can be used to receive the signal transmitted by the first embodiment.
  • the channel parameter; r l5 r 2 , r 3 , r 4 is the received signal of the receiving antenna in four symbol symbols, representing the conjugate of ⁇ ; ⁇ ⁇ is the linear transformation matrix of the transmitting end.
  • the minimum value is searched for in all ⁇ , and the corresponding value of the minimum value is output as a detection result.
  • a thirteenth embodiment of the present invention is a single receiving antenna MIMO receiver corresponding to four transmitting antennas, having a code rate of 1, and transmitting at the transmitting end using an "Alamouti" space-time code, and its structure is as shown in FIG.
  • the signal sequence in the symbol symbol received from the receiving antenna, ⁇ 2 , . . . is input to the serial to serial module 1810, and is switched from serial to parallel in groups of four.
  • the parallel received signal signal outputted by the serial and module 1810 is input to the conjugate processing module 1821, and r 2 and r 4 having an even number in the parallel received signal are conjugated, and the rr 3 having the odd number is maintained.
  • the processing result is output to the ML algorithm module 1822 as a vector i?.
  • the conjugate processing module 1821 and the ML algorithm module 1822 may constitute a signal recovery unit 1820 to restore the received signals detected in the respective symbol symbols to parallel signals.
  • the fourteenth embodiment of the present invention is a receiving method in which eight transmitting antennas and one receiving antenna, the code rate is 1, and the transmitting end encodes with an "Alamouti" space-time code, and can be used to receive the signal transmitted by the second embodiment.
  • a 4 is a channel parameter corresponding to eight receiving antennas and one receiving antenna; r s is a receiving signal of the receiving antenna within eight symbol symbols, ⁇ represents a conjugate of ⁇ ; ⁇ ⁇ is a linear transformation matrix of the transmitting end.
  • the minimum value is searched for among all, and the FT corresponding to the minimum value is output as a detection result.
  • X is a group of eight signals, each of which may take 0 or 1.
  • a fifteenth embodiment of the present invention corresponds to eight transmit antennas, a code rate of 1, and a transmit end
  • the "Alamouti" space-time code encoding single-receiver antenna MIMO receiver has a structure similar to that of FIG. 18, except that the signals transmitted in parallel between the modules in FIG. 18 are 4-way, and the signals transmitted in parallel in this embodiment are transmitted. It is 8 roads.
  • the signal sequence ⁇ , ⁇ ... in the symbol symbol received from the receiving antenna is input to the serial conversion module, and is switched from serial to parallel in groups of eight.
  • the conjugate processing module and the ML algorithm module may constitute a signal recovery unit that restores the received signal detected in each symbol symbol to a parallel signal.
  • a MIMO system signal transmitting method is as shown in FIG. 4N transmit antennas are preset, and 4N antennas are divided into 2 components into 2N groups, where N is an integer greater than 0.
  • N an integer greater than 0.
  • N l
  • 4 transmit antenna antennas 1 and 2 are a group
  • antenna 3 and antenna 4 are a group
  • the STC scheme of the MIMO system is used when orthogonal transform and "Alamouti" space-time code are used.
  • Figure 20 shows that uses orthogonal transform and "Alamouti" space-time code.
  • step 1901 the transmitting end of the MIMO system transmits four (4N) serial signals, for example, signals X 2 , X 3 and X 4 , in the serial signal stream to be transmitted, and then obtains corresponding signals.
  • the four parallel signals, the subsequent signals are equally converted every four, resulting in a parallel signal stream.
  • the present invention is applied to the transmission of a serial signal stream by serial transfer.
  • step 1902 the parallel signal stream four parallel signals are converted into two groups, for example, and for the first group 2, X 3, X 4 of the second group.
  • step 1903 the two sets of signals are linearly transformed, and each transform set generates two transform results.
  • the signal of the first group and the result of the transformation of 2 are S 3 ;
  • the results of the second set of signals 3 ⁇ 4 and x 4 are s 2 and s 4 .
  • the linear transformation performed may be an orthogonal transform, such as a Fast Fourier Transform ("Front Fourier Transform”), a Hadamard Transform (Hadamard Transform), a cosine transform, etc., so that the receiving end can be performed at the receiving end.
  • the inverse transform is easy to implement when obtaining signals, X 2 , ... X 4 , and has good performance.
  • Si (Xi + x 2 ) / ⁇
  • s 3 (Xi - x 2 ) / ⁇
  • s 2 (x 3 + x 4 ) / 2
  • s 4 (x 3 - ⁇ 4 ) / ⁇ .
  • step 1904 the four transform results obtained by the signals of the two transform groups are reorganized into two result groups by two groups, and that 8 1 and 8 2 form a first result group, and S 3 and S 4 constitute a first group.
  • Two result groups The principle of recombination is that the two transformation results in each result group are required to come from different transformation groups.
  • step 1905 the two result sets are respectively coded with a two-antenna space-time code of code rate 1, for example, "Alamouti" space-time code.
  • step 1906 the two sets of transmit antennas respectively transmit two symbols of the two-antenna space-time code encoded by the code rate of two in the two result sets.
  • the STC output by the four transmitting antennas is as shown in FIG. 21. Since each pair of antennas transmits a set of signals encoded by the "Alamouti" space-time code in each time period, the code rate of the full diversity can be made 2.
  • a MIMO system signal transmitting method is as shown in FIG. 4N transmit antennas are preset, and 4N antennas are divided into 2 components into 2N groups, where N is an integer greater than 0.
  • orthogonal transform and "Alamouti" space-time code are used, the STC scheme of the MIMO system is as shown in Fig. 23. Show.
  • step 2201 the transmitting end of the MO system transmits four (4N) serial signals in the serial signal stream to be transmitted, for example, signals, x 2 , x 3 and x 4 , after serial-to-parallel conversion. corresponding
  • the present invention is applied to the transmission of a serial signal stream by serial transfer.
  • step 2202 the parallel signal stream four parallel linear transformation signals, generates four transformation results S ⁇ S ⁇ S 3 and S 4.
  • the linear transformation performed may be an orthogonal transform, such as a fast Fourier transform, a Hadamard transform, a cosine transform, etc., so that the inverse transform at the receiving end can be easily obtained when the signal, X 2 , ... X4 is obtained. , have good performance.
  • orthogonal transform such as a fast Fourier transform, a Hadamard transform, a cosine transform, etc.
  • step 2203 the four transformation results generated by the linear transformation are divided into two result groups in groups of two, wherein, in groups of 8 1 and 8 3 , S 2 and S 4 are a group.
  • Steps 2204 to 2205 are similar to steps 1904 to 1905, respectively, and are not described herein.
  • antenna 1 and antenna 2 are a group
  • antenna 3 and antenna 4 are a group
  • antenna 5 and antenna 6 are a group
  • antenna 7 and antenna 8 are a group.
  • the STC scheme of the MIMO system when the transform and the "Alamouti" space-time code are used is as shown in FIG. 25.
  • the transmitting end of the MIMO system will have 8 of the serial signal streams to be transmitted (4N)
  • the serial signal for example, the signals XX 2 , ... X 8 , after serial-to-parallel conversion, obtains the corresponding 8 parallel signals, and the subsequent signals are equally converted every 8 to obtain a parallel signal stream.
  • the present invention is applied to the transmission of a serial signal stream by serial transfer.
  • step 2402 the eight parallel signals in the parallel signal stream are equally divided into two transform groups, for example, X 2 , X 3 and X 4 are the first group, X 5 , X 6 , X 7 and X 8 For the second group.
  • step 2403 the signals of the two transform groups are linearly transformed, and each transform group generates four transform results.
  • the signals of the first group, the transformation results of X 2 , X 3 and X 4 are Sj, S 3 , S 5 and S 7 ; the transformations of the signals of the second group X 5 , X 6 , X 7 and X 8 The results are S 2 , S 4 , S 6 and S 8 .
  • the linear transformation performed may be an orthogonal transform, such as FFT, Hadamard transform or cosine transform.
  • step 2404 the eight transformation results obtained by the signals of the two transformation groups are reorganized into two groups of four results groups.
  • S 2 constitutes a first result set
  • S 3 and S 4 form a second result set
  • S 5 and S 6 form a third result set
  • S 7 and S 8 form a fourth result set.
  • the principle of recombination is that the two transformation results in each result group are required to come from different transformation groups.
  • step 2405 the four result groups are respectively coded with a two-antenna space-time code of code rate 1, for example, "Alamouti" space-time code.
  • the four sets of transmit antennas respectively transmit the four sets of signals encoded by the two-antenna space-time code with a code rate of 1, wherein each of the two sets of antennas simultaneously transmits and continuously transmits two symbol symbols.
  • the STC output by the eight transmitting antennas is as shown in FIG. 27 of the MIMO system according to the nineteenth embodiment of the present invention.
  • N 2, 8 (4N)
  • the transmitting antenna antenna 1 and the antenna 2 are a group
  • the antenna 3 and the antenna 4 are a group
  • the antenna 5. and the antenna 6 are a group
  • the antenna 7 and the antenna 8 are a group, and the orthogonal transform and "Alamouti" are used.
  • the STC scheme of the MIMO system at time and space code is as shown in FIG.
  • step 2701 the transmitting end of the MIMO system serially converts 8 (4N) serial signals, for example, signals, X 2 , ... X 8 , of the serial signal stream to be transmitted. Corresponding 8 parallel signals, the subsequent signals are equally converted every 8 to obtain a parallel signal stream.
  • the present invention is applied to the transmission of a serial signal stream by serial transfer.
  • step 2702 eight parallel signals in the parallel signal stream are linearly transformed to obtain eight transform results S 2 , S 3 , S 4 , S 5 , S 6 , S 7 and S 8 .
  • the linear transformation performed may be an orthogonal transform, such as FFT, Hadamard transform or cosine transform.
  • step 2703 the eight transformation results are equally divided into two transformation result groups, for example, S
  • S 3 , S 5 and S 7 are grouped into one group, and S 2 , S 4 , S 6 and S 8 are divided into another group.
  • Steps 2704 to 2705 are similar to steps 2405 to 2406, respectively, and are not described here.
  • the MIMO system signal transmitting apparatus includes 2N sets of antennas of 2 sets, 2N coding modules 2931, 2932 up to 293N corresponding to 2N sets of antennas, and Transform unit 2920, transform unit 2920 includes linear transform module 2921; further, the transmitting device further includes a serial-to-parallel module 2910, where N is an integer greater than zero.
  • the serial to parallel module 2910 is configured to convert the serial signal stream to be transmitted into 4N parallel signal streams and output to the transform unit 2920.
  • the linear transform module 2921 of the transform unit 2920 is configured to linearly transform 4N input parallel signals to be transmitted into 4N transform results, and output them to 2N encoding modules 2931, 2932 to 293N in two groups; each encoding module It is used to encode the input transform result with a dual antenna space-time code of code rate 1, for example, "Alamouti" space-time code, and output the coding result to the corresponding group of antennas; and the 2N group antennas are transmitted in turn from the corresponding coding module.
  • the signal in which one set of encoded signals is transmitted simultaneously in each of the two sets of antennas every two symbol symbol times.
  • the linear transform may be an orthogonal transform, for example, an FFT, a Hadamard transform, or a cosine transform.
  • the twenty-first embodiment of the present invention is a MIMO system receiving method in which four transmitting antennas and two receiving antennas, a code rate 2, and a transmitting end are encoded by an "Alamouti" space-time code, which can be used to receive the sixteenth and tenth tenth.
  • the detection signal is:
  • H OT is the linear transformation matrix of the transmitting end, for example, it can be an orthogonal transformation matrix
  • H ⁇ represents the conjugate transposition of ⁇
  • H ⁇ represents the conjugate transposition of H OT
  • the superscript "-1" represents the inversion of the matrix.
  • a twenty-second embodiment of the present invention is a MIMO system signal receiving apparatus for encoding four transmit antennas and two receive antennas, a code rate of 2, and an "Alamouti" space-time code for a transmitting end, as shown in FIG.
  • the signals transmitted by the sixteenth and seventeenth embodiments are received.
  • the receiving device includes: two receiving antennas, a serial-to-parallel module 3010, a conjugate processing module 3021, a matrix calculation module 3022, and a matrix multiplication module 3023.
  • the serial rotation module 3021 is configured to convert the signal r y in the 4N symbol symbols serially received by the antenna into a parallel received signal output, where r y is the ith receiving antenna received in the symbol symbol j
  • the signals r font, r n , r 13 , . . . and the signals r 21 , r 22 received by the antenna 2 are converted into four signals and output in parallel to obtain parallel received signals r implica, r 12 . , r 21 , r 22 .
  • the conjugate processing module 3021 is configured to conjugate the r y whose sequence number j is an even number in the parallel received signal from the serial-to-parallel module 3010, maintain the sequence number j as an odd number r3 ⁇ 4, and output the processing result as a vector R.
  • the parallel received signals r token, r n , r , r 22 , r 12 and r 22 are conjugated, respectively
  • Matrix calculation module 3022 is used to calculate and output the matrix
  • H ra is the channel parameter matrix corresponding to each antenna
  • H OT is the linear transformation matrix of the transmitting end, H, ⁇ H stands for H. OT total
  • the yoke is transposed, H ⁇ represents the conjugate transpose of H OT , ⁇ ,; represents the variance of the zero-mean Gaussian distribution noise, and the superscript represents the inverse of the matrix.
  • the matrix multiplication module 3023 is used to multiply the matrix C by the vector R to obtain a detection result.
  • the 3023 may constitute a signal recovery unit 3020 that restores the received signals detected within the respective symbol symbols to parallel signals.
  • the twenty-third embodiment of the present invention is a MIMO system receiving method in which eight transmitting antennas and two receiving antennas, a code rate of 2, and a transmitting end are encoded by an "Alamouti" space-time code, which can be used for receiving the eighteenth and tenth The signal transmitted by the nine embodiments.
  • the channel parameters corresponding to the eight transmit antennas and the two receive antennas are where T is the Tth transmit antenna and R is the Rth receive antenna, then the signals of the two receive antennas within the four symbol symbols can be expressed as:
  • r n h ll s l + h 2l s 2 + h 31 s 3 + h 41 s 4 + n n
  • the noise sample values within the symbol are assumed to be Gaussian distribution, zero mean and same variance ⁇ .
  • the above formula can be further expressed as:
  • the receiver based on the MMSE criterion detects the signal as
  • H OT is a channel parameter matrix corresponding to each antenna
  • H OT is a linear transformation matrix of the transmitting end, for example, may be an orthogonal transformation matrix, and a conjugate transpose
  • H ⁇ represents the conjugate transpose of H OT
  • the superscript represents the inversion of the matrix.
  • the twenty-fourth embodiment of the present invention is a receiving method in which 4N transmitting antennas and two receiving antennas and a transmitting end encode using an "Alamouti" space-time code.
  • R I3 ⁇ 4 is the r2l
  • H OT is a linear transformation matrix at the transmitting end, for example, an orthogonal transformation matrix
  • the twenty-fifth embodiment of the present invention is a signal receiving apparatus for a MIMO system in which four transmitting antennas and two receiving antennas, a code rate 2, and a transmitting end are encoded by an "Alamouti" space-time code, as shown in FIG. 31, Two receiving antennas, a serial to parallel module 3110, a conjugate processing module 3121, and an ML algorithm module 3122.
  • the conjugate processing module 3121 is configured to sequence the parallel received signals from the serial to parallel module 3110 The y whose number j is an even number is conjugated, and the number j is maintained as an odd number, and the processing result is output as a vector R. For the parallel received signals r token, r n , r 2l , r 22 , the conjugate is summed with 3 ⁇ 4, respectively
  • H OT is the channel parameter matrix corresponding to each antenna, H CH
  • the conjugate processing module 3121 and the ML algorithm module 3122 may constitute a signal recovery unit 3120, and restore the received signals detected in the respective symbol symbols to parallel signals.
  • the storage medium may be a read only memory, a random access memory, a magnetic disk, an optical disk, or the like.
  • 2KM signals to be transmitted are transmitted by the KM to the antenna after linear conversion and dual antenna space-time code encoding with a code rate of 1, so each signal is transmitted via 2KM antennas, and has 2KM signals.

Abstract

La présente invention concerne un procédé d'émission et de réception de signaux d'un système MIMO et un appareil correspondant qui permettent au débit de codage en diversité complète d'au moins quatre antennes d'émission de ne pas être inférieur à 1. Le système MIMO émet des signaux au moyen de groupes KM d'antennes dans lesquels deux antennes forment un groupe, K et M étant des entiers qui sont supérieurs à 0 et tels que KM>1. Le procédé comprend les étapes suivantes: on obtient les résultats de la transformation 2KM à partir des signaux parallèles 2KM qui doivent être envoyés par la combinaison linéaire, les résultats de la transformation 2KM sont recombinés en groupes de résultat KM par deux pour faire un groupe; les deux résultats de transformation dans chaque groupe incluent la transformation linéaire de signaux 2KM; les groupes de résultats KM sont codés au moyen d'un code temps-espace à antenne double, dont le débit de codage est égal à 1; les signaux codés sont envoyés séparément par les groupes KM d'antennes, les groupes K d'antennes envoient les signaux simultanément à chaque tour.
PCT/CN2007/001572 2006-05-15 2007-05-15 Procédé d'émission et de réception de signaux d'un système mimo et appareil correspondant WO2007137490A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN200610079787 2006-05-15
CN200610079787.0 2006-05-15
CN2006100919702A CN101056162B (zh) 2006-05-15 2006-06-20 多输入多输出系统信号收发方法及其装置
CN200610091970.2 2006-06-20
CN2006100939015A CN101060356B (zh) 2006-06-23 2006-06-23 多输入多输出系统信号收发方法及收发装置
CN200610093901.5 2006-06-23

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030063654A1 (en) * 2001-05-01 2003-04-03 Onggosanusi Eko N. Space-time transmit diversity
US20050031062A1 (en) * 2003-08-07 2005-02-10 Samsung Electronics Co., Ltd. Method and apparatus for determining a shuffling pattern based on a minimum signal to noise ratio in a double space-time transmit diversity system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030063654A1 (en) * 2001-05-01 2003-04-03 Onggosanusi Eko N. Space-time transmit diversity
US20050031062A1 (en) * 2003-08-07 2005-02-10 Samsung Electronics Co., Ltd. Method and apparatus for determining a shuffling pattern based on a minimum signal to noise ratio in a double space-time transmit diversity system

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