WO2009089656A1 - Procédé et appareil pour effectuer une mise en correspondance de retard cyclique avec le signal dans un émetteur doté de multiples antennes - Google Patents
Procédé et appareil pour effectuer une mise en correspondance de retard cyclique avec le signal dans un émetteur doté de multiples antennes Download PDFInfo
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- WO2009089656A1 WO2009089656A1 PCT/CN2008/000123 CN2008000123W WO2009089656A1 WO 2009089656 A1 WO2009089656 A1 WO 2009089656A1 CN 2008000123 W CN2008000123 W CN 2008000123W WO 2009089656 A1 WO2009089656 A1 WO 2009089656A1
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
Definitions
- the present invention relates to the field of wireless communications, and more particularly to a method and apparatus for cyclic delay mapping processing of signals in a multi-antenna transmitter. Background technique
- OFDM OFDMA SC-FDMA
- WiMAX WiMAX
- the diversity gain has a strong dependence on channel conditions.
- frequency diversity cannot be achieved; in addition, narrowband systems such as 1.25 MHz and 2.5 MHz tend to have weaker frequency selectivity for a given channel condition. This is mainly due to the fact that the relevant bandwidth of the channel is determined by the Delay Spread of the user channel.
- the Rician Channel may also appear in some cases to cause a channel that is not frequency selective.
- CDD cyclic delay diversity
- the same one-way modulation symbols are respectively subjected to four cyclic delay processes, that is, respectively, using cyclic delay parameters e- j2m determined based on known channel conditions. /N; e J2m '/N; e j27t WN; e- ⁇ VV performs phase shift processing on it, resulting in four-way cyclic delay Processed signal.
- the pilot transmission, the IFFT (anti-fast Fourier transform), and the addition of the cyclic prefix (CP), frequency conversion, and the like the signals to be transmitted are transmitted via the four transmitting antennas.
- cyclic processing is not performed on the processed signal (that is, the cyclic delay parameter VV/e J2m '/N shown in FIG. 1b is used; e J2K WN; the module for phase shifting the signal does not exist.
- the OFDM symbol formed after IFFT is as shown in Fig. 2a.
- the signal to be processed is subjected to cyclic delay processing and then subjected to IFFT transform, and thus an OFDM symbol as shown in FIG. 2b is obtained.
- the second portion shown in a dotted manner is moved to the front of the first portion shown in a line. Therefore, frequency selectivity can be introduced.
- deep fading occurs, all subcarriers of an OFDM symbol will not be trapped in a deep fading state, thereby facilitating channel coding and decoding and improving system robustness.
- FIG. 3 is in the CDD+STBC system.
- SM spatial multiplexing
- CDD system a multi-antenna system using CDD alone is simply referred to as a CDD system, which The transmitter in the corresponding one is called CDD transmitter; the system combining CDD and STBC is abbreviated as CDD+STBC system, the transmitter is correspondingly called CDD+STBC transmitter; the system which combines CDD and SM is abbreviated For the CDD+SM system, the transmitter is correspondingly referred to as the CDD+STBC transmitter.
- CDD system the CDD+STBC system, and the CDD+SM system are collectively referred to as a CDD type system
- CDD transmitter, the CDD+STBC transmitter, and the CDD+SM transmitter are collectively referred to as a CDD type transmitter, respectively.
- the cyclic delay parameter for cyclically processing the signal to be processed ( ⁇ ... ⁇ 3 shown in FIG. 1a, e-j2m./N; e j2m shown in FIG. 1b) /N; e' j2n WN; 27r VN, etc.) does not change with time, that is, in the case of Figure lb, the signal transmitted on antenna TX-1 must be a signal that uses 2 VV for cyclic delay processing, antenna TX The signal sent on -2 must be the signal that uses e- ⁇ VV for cyclic delay processing (other antennas and so on, and will not be described again).
- CDD-like systems are very sensitive to the spatial correlation between antennas, angle of arrival, angle spread, and so on. Therefore, it is very difficult to predefine a set of cyclic delay parameters that enable the system to consistently exhibit high performance under changing wireless channel conditions.
- cyclic delay parameters that enable the system to consistently exhibit high performance under changing wireless channel conditions.
- System performance can get worse over time.
- an object of the present invention is to provide a new technical solution in which a CDD type transmitter generates a multiplex signal corresponding to a plurality of transmitting antennas using a varying cyclic delay mapping rule.
- the cyclic delay parameter corresponding to one or more of the plurality of transmit antennas is thereby varied over time to avoid degradation of system performance over time.
- a method for cyclically delaying mapping a signal in a multi-antenna transmitter of a network device based on multi-carrier modulation characterized in that Cyclic delay mapping rule for multipath
- the processing signal is subjected to cyclic delay mapping processing to generate a signal of a plurality of cyclic delay mapping processes respectively corresponding to the plurality of transmitting antennas of the transmitter.
- a network design apparatus based on multi-carrier modulation characterized in that cyclically delay mapping processing is performed on a plurality of signals to be processed with a varying cyclic delay mapping rule to generate and transmit
- the plurality of transmit antennas of the machine respectively correspond to the signals processed by the multiple cyclic delay mapping.
- one or more of the multiplexed signals corresponding to the plurality of transmitting antennas use varying cyclic delay parameters, thereby enhancing the robustness of the system.
- the present invention can obtain greater gain than the prior art under the same conditions.
- FIG. la shows the physical layer structure of the transmitter implementing the CDD in the time domain in the prior art
- Figure lb shows the physical layer structure of the transmitter implementing the CDD in the frequency domain in the prior art
- Figure 2a is a non-cyclic delay Schematic diagram of the formed OFDM symbol
- FIG. 2b is a schematic diagram of an OFDM symbol formed by cyclic delay processing
- FIG. 3 is a schematic diagram of a physical layer of a transmitter in the existing CDD+STBC system
- FIG. 4 is a conventional CDD+ Schematic diagram of a transmitter physical layer in an SM system
- FIG. 5 is a flowchart of a method for cyclically delaying mapping a signal in a multi-antenna transmitter of a multi-carrier modulation based network device according to an embodiment of the present invention ;
- Figure 6a illustrates a transmitter physical layer structure of a CDD implemented in a time domain in accordance with an embodiment of the present invention
- Figure 6b illustrates a transmitter physical layer structure of a CDD implemented in the frequency domain in accordance with an embodiment of the present invention
- Figure 7 is a CDD+STBC transmitter physics in accordance with an embodiment of the present invention.
- Figure 8 is a block diagram of a physical layer of a CDD+SM transmitter in accordance with an embodiment of the present invention.
- FIG. 9 is a block diagram of a first processing apparatus for performing cyclic delay mapping processing on a signal in a multi-antenna transmitter of a multi-carrier modulation based network device, in accordance with an embodiment of the present invention.
- Figure 10a is a graph comparing performance of a CDD system based on the prior art
- Figure 10b is a graph comparing the performance of the CDD+STBC system based on the prior art
- Figure 10c is a performance comparison diagram of a CDD+SM system based on the present invention and based on the prior art.
- CDD-like systems most typically include CDD systems, CDD+STBC systems, CDD+SM systems, however, those skilled in the art understand that CDD techniques can also be combined with other MIMO (Multiple Input Multiple Output) techniques such as spatial diversity.
- MIMO Multiple Input Multiple Output
- the combination of the present invention is equally applicable to this case based on its basic idea.
- FIG. 5 is a flow chart of a method for cyclically delaying mapping of signals in a multi-antenna transmitter of a multi-carrier modulation based network device in accordance with an embodiment of the present invention.
- the present invention will be described in detail with reference to the flowchart shown in FIG. 5 in conjunction with the physical layer diagram of the transmitter in the specific embodiments of the present invention.
- a transmitter having four transmit antennas is exemplified, and those skilled in the art can apply the present invention to a transmitter having any multi-transmit antenna without creatively in conjunction with the description of the four-day transmitter below.
- FIG. 6a, 6b are schematic diagrams showing the physical layer structure of a CDD transmitter for implementing the present invention in the time domain and the frequency domain, respectively, wherein the corresponding existing CDD transmissions shown in Figures la and lb are shown.
- the physical layer of the CDD transmitter provided by the present invention adds an antenna replacement device (module) after the cyclic delay device (module) for delay or phase shift.
- module an antenna replacement device
- FIG. 7b as an example without loss of generality.
- the original source bit stream is channel-coded, interleaved, and modulated, and mapped onto the m-th subcarrier in the nth OFDM symbol.
- the signal stream composed of S vn) is copied into four signals to be processed and enters a cyclic delay processing device, wherein each of the signals to be processed is utilized by e- j2 .
- the signal processed by the cyclic delay corresponds to the kth transmit antenna by default, and is shown here as
- the predetermined condition includes any one of the following:
- Condition 1 The validity period of the currently used cyclic delay mapping rule expires;
- Condition 2 The signal quality at the receiver is below a predetermined threshold.
- the correlation of the channel is determined by the transmission environment which usually has time-varying. Therefore, defining the validity period for the cyclic delay mapping rule as in the first condition can effectively prevent the system performance from degrading due to the long-term use of a rule.
- the timer can be used to record the time using a rule and determine whether the length of time reaches a time length threshold to determine whether the condition 1 is satisfied; the condition 1 can also be passed through a counter. Emitted using a rule The number of OFDM symbols is recorded and it is judged whether the number reaches a threshold number of symbols to determine whether condition 1 is satisfied.
- the signal quality at the receiver should be The criteria for replacing the loop mapping rules are also preferred.
- the signal quality at the receiver may be measured by the receiver and fed back to the network device where the transmitter is located via the control channel.
- the determination process in step S10 will be described by taking condition 1 as an example without loss of generality.
- the transmitter is performing cyclic delay mapping processing on the signal using a cyclic delay mapping rule. Specifically, it is assumed that the antenna replacement device shown in FIG. 7a does not cycle through the incoming paths. The delay processed signal interferes with the default correspondence between the respective transmitting antennas, thereby outputting four signals corresponding to the respective transmitting antennas to the downstream serial/parallel switching means (modules) by default.
- the determination in step S10 can be performed by the antenna replacement device shown, or can be performed by a functional module not shown in the figure, and the judgment result is timely notified to the Antenna replacement device.
- the determining process in the step S10 is preferably performed repeatedly in a predefined period.
- step S10 the judgment result obtained after a certain execution of step S10 is:
- the predetermined condition is satisfied, which is typically because the currently used cyclic delay mapping rule has experienced a time equal to its validity period since the time of activation. Therefore, in order to ensure that the system does not suffer from performance degradation due to long-term use of the same cyclic delay mapping rule, it is preferable to update the cyclic delay mapping rule.
- the following 24 permutation matrices are pre-stored at the transmitter.
- one of the 24 permutation matrices is selected in step S11 to determine a new one in this example.
- Cyclic delay mapping rules :
- any one of the permutation matrices there is only one element in any row or column, and the rest are all zero.
- step S12 The selected one of the permutation matrices is used in step S12 for mapping the cyclically processed processed signal as in equation (2):
- Wl is used for mapping processing, so that mapping to the antenna ⁇ -1, mapping e ⁇ Hn') to the antenna TX-2, mapping e ⁇ VV's ⁇ m) to the antenna TX —3, and map ⁇ 27r V ⁇ (w, ) to antenna TX-4.
- the other permutation matrix different from ⁇ should be selected to perform the mapping operation, and the selection process may be sequentially selected according to the numbers of the permutation matrices described above, that is, after the replacement matrix Wr expires, automatically The replacement matrix w r+1 is selected , without loss of generality, assuming that w 2 is selected in step S11.
- w 2 is used for the left multiplication X, thereby mapping e VN (", w ) to the antenna TX-1, mapping VA ⁇ ( «, to the antenna TX-2, map ⁇ ⁇ H ”) to antenna TX-3, and map e- ⁇ VN ⁇ )
- the signal sent by ⁇ _3 subjected to the cyclic delay processing is sent by the antenna TX-4, and the signal which has been cyclically delayed by the e- ⁇ VV originally transmitted via the antenna TX-4 is sent out by the antenna TX-3, which is helpful. Maintain system performance as time passes.
- the transmitter selects one or more cyclic delay parameters from the pre-stored plurality of cyclic delay mapping parameters according to a preset rule, and uses the selected ones.
- the parameter replaces one or more elements in the cyclic delay parameter vector used in the previous cyclic delay mapping rule, such as
- the transmitter utilizes 4/N
- a 6 / ⁇ four-way pending signal (all cyclic delay processing, get n / N default corresponding to TX - 1, TX - 2, TX - 3 and TX - 4 four-way cyclic delay processing signal e ' j27t WN' S(n,m), negligence ' S(n,m), negligence ⁇ S(n,m), e— j2 N′ S(n,m).
- the antenna replacement module may select one of w 2 -w 24 to interfere with the correspondence between the respective signals and the transmitting antenna, or may perform corresponding according to the default correspondence. The antenna is emitted.
- the plurality of cyclic delay mapping parameters may not be pre-stored, but each time a new cyclic delay mapping rule needs to be determined, by applying a predetermined algorithm to certain specific parameters such as time Channel related information, etc., to generate one or more cyclic delay parameters in real time and use them to replace the currently used cyclic delay parameters to determine a new cyclic delay mapping rule.
- the CDD transmitter in accordance with the present invention particularly the CDD transmitter therein, is described in detail above.
- a CDD+STBC system particularly a CDD+STBC transmitter therein, will be described with reference to FIG. 5 in conjunction with FIG.
- Figure 7 is a block diagram of the physical layer of a CDD+STBC transmitter in accordance with an embodiment of the present invention.
- the original source bit stream is channel coded, interleaved, and modulated, and the resulting modulation symbol stream >S(n, ) enters the STBC coding module for space time coding, and the nth OFDM symbol is used.
- mapping operation of equation (4) is performed by any one of the pre-stored 24 permutation matrices as described above:
- equation (4) can be written as equation (5):
- the default correspondence between the cyclic delay processed signal and the transmitting antenna before processing by the antenna replacement module is: e' j2 WN'S , m) ⁇ TX - 1 ; e J2KT '/N- S 0 (n,m) Antenna TX-2; e j2n WN- S x ⁇ n,m) ⁇ Antenna TX-3; ⁇ 32 ⁇ '/ ⁇ - S x ⁇ n, m) ⁇ Antenna TX__4.
- the mapping relationship between each signal and the antenna becomes: e j2K WN- S 0 (n, m) ⁇ antenna TX-1; e J2m '/N- S 0 (n, m Antenna TX-2; e- ⁇ W'S ⁇ ) Antenna TX-3; e- j2n WN'S, (i, m) ⁇ Day TX-4.
- the transmitter selects one or more cyclic delay parameters from the pre-stored plurality of cyclic delay mapping parameters according to a preset rule, and uses the selected ones.
- the parameter replaces one or more elements in the cyclic delay parameter vector used in the previous cyclic delay mapping rule, eg, ⁇ . Replace with ⁇ " and replace ⁇ with T k .
- step S12 in the illustrated cyclic delay module, the transmitter performs a cyclic delay processing on the processed signal, and the corresponding equation (3) is transformed as:
- the antenna replacement module may select one of w 2 -w 24 to interfere with the correspondence between the respective signals and the transmitting antenna, or may use the corresponding antenna according to the default correspondence. issue.
- the determination principle of the new rule can be automatically or manually Line preset.
- the plurality of cyclic delay mapping parameters may not be pre-stored, but each time a new cyclic delay mapping rule needs to be determined, by applying a predetermined algorithm to certain specific parameters such as time Channel related information, etc., to generate one or more cyclic delay parameters in real time and use them to replace the currently used cyclic delay parameters to determine a new cyclic delay mapping rule.
- CDD+SM system particularly a CDD+SM ee transmitter therein, will be described with reference to FIG. 5 and FIG.
- Figure 8 is a block diagram of a physical layer of a CDD+SM transmitter in accordance with an embodiment of the present invention.
- the modulation symbol stream S z is serial/parallel transformed to form a first path signal: [S1, S3, ..., S2k+1, ...] and a second path signal: [S2, S4, ..., S2k , ⁇ . ⁇ ] , 3 ⁇ 4i p. 1 taking the first pair of modulation symbols S1 (belonging to the first path signal) and S2 (belonging to the second path signal) after serial/parallel conversion as an example, copying and passing through cyclic delay processing as shown in the figure After, the resulting
- N is the size of the FFT transform
- k is the subcarrier number
- Each pair of modulation symbols is mapped to four transmit antennas in the form of:, ie, without cyclic delay (or as its cyclic delay parameter ⁇ is 0), the first signal is sent via the transmit antenna ⁇ -1
- the second signal that has not been processed by the cyclic delay is sent via the transmitting antenna ⁇ -2; the first signal that participates in the cyclic delay processing via 0 1 is sent via the transmitting antenna ⁇ 3; the second path that participates in the cyclic delay processing via ⁇ 2
- the signal is sent via the transmitting antenna ⁇ 4.
- an output matrix represented by the following equation (7) can be realized by means of an antenna replacement module introduced in a CDD+SM transmitter:
- Equation (8) s 1 3 e l s 23
- the cyclic delay parameters used for the signals transmitted via the four transmitting antennas are constantly changing, thereby preventing the performance of the system from deteriorating over time.
- the update of the cyclic delay mapping rule can also be implemented by periodically/non-periodically changing the cyclic delay parameters.
- the receiver first estimates the frequency response (CFR) i7 of the channel by means of the pilot signal, and then detects the received signal according to the minimum mean square error criterion (MMSE) or the maximum likelihood ratio criterion (ML), taking ML as an example. , using the scheme shown in equation (10):
- the first processing device 10 shown in FIG. 9 includes: a determining device 100, a determining device 101, and a second processing device 102.
- the determining device 101 includes a generating device 1010 and a selecting device 1011.
- the determining means 100 is responsible for preferably periodically determining whether the predetermined condition is satisfied.
- the predetermined condition is that the validity period of the previous cyclic delay mapping rule expires.
- the determining apparatus 100 may include a timer that starts timing when the cyclic delay mapping process is performed on the signal from the previous cyclic delay mapping rule, and after the elapsed time reaches a time length threshold, The judging device 100 outputs a judgment result indicating that the predetermined condition is satisfied.
- the determination result is provided to the determining means 101, in which a new cyclic delay mapping rule different from the currently used cyclic delay mapping rule is determined and supplied to the second processing Device 102.
- the difference between the new cyclic delay mapping rule and the previous cyclic delay mapping rule may be as follows:
- the cyclic delay map vector used for cyclic delay processing of the signal to be processed is different, and the mapping method for mapping the cyclically processed multiplexed signals is also different.
- the generating means 1010 in the determining means 101 generates a second cyclic delay mapping vector different from the first cyclic delay mapping vector used by the currently used cyclic delay mapping rule, the selecting means 1011 being Pre-stored multiple In the mapping manner, a second mapping manner different from the first mapping manner used by the currently used cyclic delay mapping rule is selected. Thereby determining the new cyclic delay mapping rule.
- Table 1 shows the conditions set during the simulation: Table 1: Simulation conditions
- Figure 10a is a performance comparison diagram of a CDD system based on the prior art based on the present invention, wherein the ordinate is the block error rate (BLER) and the abscissa is the signal to noise ratio of each receiving antenna.
- BLER block error rate
- the present invention has a relatively close effect to the prior art when the independent channel or the correlation is weak (corresponding to the case where the antenna spacing is 4 ⁇ ).
- the relevant channel corresponding to the case where the antenna pitch is 0.5 ⁇
- the present invention can obtain a gain of 1.8 dB compared to the prior art when the BLER is 0.01. See, for CDD System, the present invention is more robust in the face of spatial correlation than prior art.
- Figure 10b is a graph comparing the performance of a CDD+STBC system based on the prior art based on the present invention. It can be clearly seen that the present invention has a relatively close effect to the prior art when the independent channel or the correlation is weak (corresponding to the case where the antenna spacing is 4 ⁇ ). However, for the relevant channel (corresponding to the case where the antenna pitch is 0.5 ⁇ ), the present invention can obtain a gain of 0.5 dB compared to the prior art when the BLER is 0.01. It can be seen that for CDD systems, the present invention is more robust in the face of spatial correlation than prior art.
- Figure 10c is a performance comparison diagram of a CDD+SM system based on the present invention and based on the prior art. It can be clearly seen that the present invention has a relatively close effect to the prior art when the independent channel or the correlation is weak (corresponding to the case where the antenna spacing is 4 ⁇ ). However, for the relevant channel (corresponding to the case where the antenna pitch is 0.5 ⁇ ), the present invention can obtain a gain of 0.8 dB compared to the prior art when the BLER is 0.01. It can be seen that for CDD systems, the present invention is more robust in the face of spatial correlation than prior art. While the foregoing is a description of the embodiments of the present invention, it is not intended to limit the scope of the invention, and various modifications may be made to the embodiments without departing from the scope and spirit of the invention. Such modifications are all within the scope of the invention.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/863,222 US8599950B2 (en) | 2008-01-17 | 2008-01-17 | Method and device for cyclic delay mapping for the signal in the multi-antenna transmitter |
EP08700672.2A EP2234286B1 (en) | 2008-01-17 | 2008-01-17 | Method and apparatus for performing cyclic delay mapping to signals in multiple antenna transmitters |
PCT/CN2008/000123 WO2009089656A1 (fr) | 2008-01-17 | 2008-01-17 | Procédé et appareil pour effectuer une mise en correspondance de retard cyclique avec le signal dans un émetteur doté de multiples antennes |
CN2008801243925A CN101978616B (zh) | 2008-01-17 | 2008-01-17 | 多天线发射机中对信号进行循环延迟映射的方法和装置 |
KR1020107018002A KR101409730B1 (ko) | 2008-01-17 | 2008-01-17 | 다중-안테나 송신기에서 신호에 대한 순환 지연 맵핑을 행하는 방법 및 장치 |
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PCT/CN2008/000123 WO2009089656A1 (fr) | 2008-01-17 | 2008-01-17 | Procédé et appareil pour effectuer une mise en correspondance de retard cyclique avec le signal dans un émetteur doté de multiples antennes |
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US (1) | US8599950B2 (zh) |
EP (1) | EP2234286B1 (zh) |
KR (1) | KR101409730B1 (zh) |
CN (1) | CN101978616B (zh) |
WO (1) | WO2009089656A1 (zh) |
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EP2234286B1 (en) | 2016-07-20 |
EP2234286A1 (en) | 2010-09-29 |
CN101978616A (zh) | 2011-02-16 |
KR101409730B1 (ko) | 2014-06-19 |
CN101978616B (zh) | 2013-06-12 |
EP2234286A4 (en) | 2012-10-17 |
KR20100114522A (ko) | 2010-10-25 |
US20100309999A1 (en) | 2010-12-09 |
US8599950B2 (en) | 2013-12-03 |
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