KR101373980B1 - Signal processing method, transmitting apparatus and receiving apparatus based on est in mimo spatial multiplexing - Google Patents

Abstract

Disclosed are a signal processing method, a transmitting device, and a receiving device in an EST based multi-antenna spatial multiplexing communication system. A receiving apparatus in an EST based multi-antenna spatial multiplexing communication system includes a plurality of receiving antennas; A detector detecting a signal received from the plurality of antennas; An IEST performer for performing EST inverse transform on the signal of the detector; A determination unit that determines a symbol level of an output signal of the IEST execution unit; A symbol delay unit for delaying the signal determined by the determination unit to a predetermined time; And an EST performer for performing an EST conversion on the signal output from the symbol delay unit to feed back to the detector, wherein the detector is configured to maximize the interference and noise of the signal compared to the signal of the signal determined in the previous iteration. A filter is designed, and the received signal is detected using the forward filter and the feedback filter. According to the present invention, BER performance can be improved by transmitting a transmission signal to a receiver by preprocessing the transmission signal to minimize the BER of the multi-antenna spatial multiplexing system.

Description

SIGNAL PROCESSING METHOD, TRANSMITTING APPARATUS AND RECEIVING APPARATUS BASED ON EST IN MIMO SPATIAL MULTIPLEXING}

Embodiments of the present invention relate to a signal processing method, a transmitting device and a receiving device in an EST based multi-antenna spatial multiplexing communication system, and more particularly, to a signal processing method and a transmitting device for minimizing a bit error rate in a multi-antenna spatial multiplexed communication system. And a receiving device.

In the next generation communication environment, research is being conducted on a wireless communication system capable of supporting high quality and high speed data transmission to provide various multimedia services including voice service. Among these studies, researches on a multiple-input multiple-output (MIMO) wireless communication system using a channel in the spatial domain have been actively conducted.

MIMO wireless communication systems can be classified into two system types using a space-time coding (STC) technique and a spatial multiplexing (SM) technique.

Among these, the spatial multiplexing technique maximizes the data rate by transmitting several data symbols simultaneously. The core technology of the spatial multiplexing technique is the signal detection technique, which can achieve a significant performance improvement if the MIMO channel information is known to the receiver as well as the receiver. Such a system is called a closed-loop MIMO system.

In case of using a linear detector at the receiver, MIMO channel capacity can be obtained by using Singular Value Decomposition (SVD) based technique and water filling power allocation and bit allocation. Since SVD decomposes the MIMO channel into subchannels with very different signal to noise ratios (SNRs), different bits must be allocated to different subchannels in order to obtain channel capacity. However, this improves system complexity.

In order to solve this problem, it is assumed that the same bit is allocated to all subchannels, and thus the overall bit error rate (BER) is greatly affected by the lowest SNR. Optimizing BER requires assigning more power to subchannels with lower SNR. This is the opposite of water filling. Therefore, when using a linear detector, BER and channel capacity cannot be optimized simultaneously.

Therefore, even after allocating the same bit to different subchannels, preprocessing techniques such as a geometric mean decomposition (GMD) technique and a uniform channel decomposition (UCD) technique have been invented to optimize BER and channel capacity.

The journal Yi Jiang a, William W. Hager, Jian Li, "Geometric Mean Decomposition" Linear Algebra and its Applications Volume 396, 1 February 2005, Pages 373-384, describes the GMD technique. , IEEE, Jian Li, Fellow, IEEE, and William W. Hager "Uniform Channel Decomposition for MIMO Communications", Uniform Channel Decomposition for MIMO Communications, discloses a UCD technique.

GMD and UCD techniques use non-linear Zero-Forcing Decision-Feedback (ZF-DF) detector and Minimum Mean Square Error Decision-Feedback (MMSE-DF) detector, respectively, at the receiving end.

The GMD technique decomposes the MIMO channel into subchannels with the same SNR to optimize BER. In the high SNR region, the GMD technique obtains optimal channel capacity asymptotically, while in the low SNR region, the zero-forcing operation causes significant channel capacity loss.

In order to secure this, UCD based on MMSE-DF has been proposed. The UCD technique obtains an optimal channel capacity in the entire SNR region. The MMSE-DF detector has a higher performance than the ZF-DF detector, but it has a lower performance compared to the complex maximum likelihood (ML) detector.

On the other hand, the repetitive channel equalization technique based on the recently introduced Energy Spreading Transform (EST) has attracted attention by efficiently eliminating interference between signals with low complexity of the linear equalization technique. EST is a method of distributing each symbol energy at different frequencies and times, and EST enables repeated signal detection.

Accordingly, there is a need for a low complexity and high performance communication technique and an appropriate data preprocessing method in an EST based multi-antenna spatial multiplexing communication system.

In order to solve the problems of the prior art as described above, the present invention proposes a signal processing method, a transmitting device and a receiving device in an EST-based multi-antenna spatial multiplexing communication system that minimizes the bit error rate.

Other objects of the invention will be apparent to those skilled in the art from the following examples.

According to a preferred embodiment of the present invention to achieve the above object, a plurality of receiving antennas; A detector detecting a signal received from the plurality of antennas; An IEST performer for performing EST inverse transform on the signal of the detector; A determination unit that determines a symbol level of an output signal of the IEST execution unit; A symbol delay unit for delaying the signal determined by the determination unit to a predetermined time; And an EST performer for performing an EST conversion on the signal output from the symbol delay unit to feed back to the detector, wherein the detector is configured to maximize the interference and noise of the signal compared to the signal of the signal determined in the previous iteration. There is provided a receiving apparatus in an EST based multi-antenna spatial multiplexing communication system, wherein the filter is designed and the received signal is detected using the forward filter and the feedback filter.

The determination unit may perform symbol level determination by soft decision.

The detection unit may include: a measurement unit measuring signal power, noise power, and interference power of a signal determined by the determination unit in the previous iteration; And a filter design unit for predicting the interference and noise relative to the signal using the signal power, the interference power, and the noise power, and designing the forward filter and the feedback filter to maximize the predicted interference and noise. Can be.

And a channel estimator for estimating channel information between the transmitting apparatus and the receiving apparatus, wherein the filter design unit measures the distortion power measured by using the signal delayed by the symbol delay unit and the total amount of power used by the transmitting apparatus. Using the estimated channel information, the forward filter may be designed to maximize interference and noise compared to the predicted signal.

The filter design unit may design the feedback filter using the channel information and the forward filter.

The signal fed back from the EST performer is processed through the feedback filter, the signals received from the plurality of antennas are processed through the forward filter, and the signal processed through the forward filter is processed through the feedback filter. Subtracted by the signal may be input to the IEST execution unit.

The signal received from the plurality of antennas may be a signal processed by a transmission filter for minimizing a bit error rate of the multi-antenna spatial multiplexing system in a transmitting apparatus.

The transmitting device may receive the estimated channel information between the transmitting device and the receiving device from the receiving device, and design the transmitting filter using the estimated channel information.

The detector may repeatedly update the design of the forward filter and the feedback filter by a predetermined loop.

According to another embodiment of the present invention, a transmission apparatus in an EST-based multi-antenna spatial multiplexing communication system, comprising: a plurality of transmitting antennas; A transmitting side EST performer coupled to each of the plurality of transmitting antennas to perform EST conversion on signals to be transmitted from the plurality of transmitting antennas; And designing a transmission filter for minimizing a bit error rate (BER) of the multi-antenna spatial multiplexing system by using channel information between the transmitting device and the receiving device, and converting the signal output from the transmitting EST execution unit into the transmission filter. Transmitting apparatus is provided in the EST-based multi-antenna spatial multiplexing communication system characterized in that it comprises a signal processor for processing through the transmission to the plurality of transmit antennas.

According to another embodiment of the present invention, a signal processing method of a transmitting apparatus in an EST-based multi-antenna spatial multiplexing communication system, the method comprising: performing EST conversion for signals to be transmitted at each of a plurality of transmitting antennas; Designing a transmission filter that minimizes a bit error rate (BER) of the multi-antenna spatial multiplexing system by using channel information between the transmitting device and the receiving device; And processing the signal output from the transmitting EST performing unit through the transmitting filter and transmitting the signal to the plurality of transmitting antennas. The signal processing method of the transmitting apparatus in the EST-based multi-antenna spatial multiplexing communication system This is provided.

According to the present invention, BER performance can be improved by transmitting a transmission signal to a receiver by preprocessing the transmission signal to minimize the BER of the multi-antenna spatial multiplexing system. In addition, by processing the received signal through a forward filter and a feedback filter designed to maximize the signal-to-interference and noise ratio in the receiving device, there is an advantage that can efficiently transmit and receive a large number of data while having a low complexity.

1 is a block diagram illustrating a transmission apparatus in an EST based multi-antenna spatial multiplexing communication system according to an embodiment of the present invention.
2 is a block diagram illustrating a receiving apparatus in an EST based multi-antenna spatial multiplexing communication system according to an embodiment of the present invention.
3 is a block diagram showing a detailed configuration of a detector according to an embodiment of the present invention.
4 is a flowchart illustrating a signal processing method of a transmitting apparatus in an EST based multi-antenna spatial multiplexing communication system according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention proposes a wireless communication system capable of efficiently transmitting a plurality of data and separating them from a receiving apparatus by applying EST to each transmitting antenna in an energy spreading transform (EST) based multi-antenna spatial multiplexing wireless communication system. In addition, we propose a communication system that is suitable for EST-based Spatial Multiplexing Systems and optimizes BER (Bit Error Rate) performance.

1 is a block diagram illustrating a transmission apparatus in an EST-based multi-antenna spatial multiplexing communication system according to an embodiment of the present invention, and FIG. 2 is a block diagram of an EST-based multi-antenna spatial multiplexing communication system according to an embodiment of the present invention. It is a block diagram showing a receiving device.

Hereinafter, an EST-based multi-antenna spatial multiplexing communication system of the present invention will be described with reference to FIGS. 1 and 2.

Here, the transmitter 100 modulates data after applying EST to each transmit antenna and transmits a signal to the receiver 200 by preprocessing the data. here. An EST composed of different permutation matrices is applied to each transmitting antenna in order to efficiently separate data in the receiving apparatus 200.

The receiver 200 uses an EST based iterative equalizer. The EST-based iterative equalization technique is described by the inventors of T.Hwang and Y. (G.) Li, "Novel iterative equalization based on energy spreading transform," IEEE Trans. Signal Process. vol. 54, no. 1, pp. 190-203, Jan. From 2006.

The transmitting device 100 according to an embodiment of the present invention may include a transmitting side controller 110 and a transmitting antenna 120. In addition, the transmitter side controller 110 may include a transmitter EST performer 112 and a signal processor 114.

The receiving apparatus 200 according to the exemplary embodiment of the present invention may include a receiving antenna 210, a receiving side controller 220, and a receiving side transmitter 230. In addition, the receiving controller 220 may include a detector 221, a receiver IEST performer 222, a determiner 223, a symbol delay unit 224, a receiver EST performer 225, and a channel estimator 226. ) May be included.

는 복수의 송신 안테나(120) 중 i 번째 송신 안테나가 송신하고자 하는 심볼(symbol)들로 이루어진 스트림을 의미한다. 여기서 N은 정수이며 스트림의 사이즈를 의미한다. 또한, i는 안테나 인텍스, T는 traspose를 의미한다. 또한. 본 발명에서

는 각 심볼의 파워(power)를 의미한다.In the present invention

Denotes a stream consisting of symbols to be transmitted by the i th transmit antenna among the plurality of transmit antennas 120. Where N is an integer and represents the size of the stream. In addition, i means antenna index and T means traspose. Also. In the present invention

Denotes the power of each symbol.

에 대한 EST에 기반한 변조를 수행한다. 즉, 각 심볼의 에너지를 다른 주파수 및 다른 시간으로 분산시키는 변환을 수행한다.The transmitting side EST performing unit 112 is provided corresponding to the plurality of transmitting antennas 120,

Perform EST-based modulation on. That is, a transformation is performed to disperse the energy of each symbol at different frequencies and at different times.

와 같이 표현될 수 있다. Modulation results based on EST

Can be expressed as

를 통해 출력하여 복수의 송신 안테나(120)로 전달한다.The signal processing unit 114 transmits a signal output from the transmitting side EST execution unit 112 to a transmission filter.

Output through and transmits to a plurality of transmit antenna (120).

를 수신한다. 이어서, 신호 처리부(114)는 채널정보

를 이용하여 EST 기반 다중 안테나 공간 다중화 시스템의 BER을 최소화하는 송신 필터

를 하기의 수학식 1과 같이 설계한다.To this end, the signal processor 114 may transmit channel information between the transmitter 100 and the receiver 200 transmitted from the receiver side transmitter 230.

. Subsequently, the signal processor 114 performs channel information.

Transmit Filter to Minimize BER in EST-based Multi-antenna Spatial Multiplexing Systems

Is designed as in Equation 1 below.

[ Equation 1 ]

는

의 우특이(right singular) 행렬,

는 각 성분의 크기가

인 유니터리(unitary) 행렬,

는 상기 송신 안테나의 수를 각각 의미한다.here,

The

Right singular matrix of,

Is the size of each component

Unitary matrix,

Denotes the number of transmit antennas, respectively.

를 이용하여 하기의 수학식 2와 같이 송신측 EST 수행부(112)에서 변조된 신호를 처리한다.The signal processor 114 is a transmission filter designed as shown in Equation 1 above.

The modulated signal is processed by the transmitting EST execution unit 112 as shown in Equation 2 below.

& Quot; (2 ) & quot ;

은 n 번째 시간슬롯에 해당하는 변조된 신호벡터를 의미한다.here,

Denotes a modulated signal vector corresponding to the n th time slot.

를 송신 안테나(120)로 전달한다.The signal processor 114 is a signal

Is transmitted to the transmitting antenna 120.

개의 송신 안테나를 통해 신호 처리부(114)에서 처리된 신호들을 순차적으로 수신 안테나(210)로 송신한다.The transmit antenna 120

The signals processed by the signal processor 114 are sequentially transmitted to the receiving antenna 210 through the two transmitting antennas.

배로 감소시킨 후 감소된 신호를 송신한다. 이는 송신 안테나(120)에서 신호를 송신함에 있어 소요되는 전력의 총량을

로 유지하기 위함이다.Meanwhile, the transmitting antenna 120 measures the magnitude of the signal transmitted through each antenna.

Reduce by doubling and transmit the reduced signal. This is the total amount of power required to transmit a signal at the transmit antenna 120.

To maintain.

The receiving antenna 210 of the receiving apparatus 200 receives the signals transmitted from the transmitting antenna 120.

는 i 번째 수신 안테나(210)로부터 수신된 신호를 의미한다. 본 발명에서

는 n 번째 시간슬롯에서 각 수신 안테나(210)로부터 수신된 신호를 벡터형식으로 표현한 것이다. 이 수신 신호의 벡터는 하기의 수학식 3과 같이 표현될 수 있다.2,

Denotes a signal received from the i-th reception antenna 210. In the present invention

Denotes a vector received signal from each receive antenna 210 in the nth time slot. The vector of the received signal may be expressed by Equation 3 below.

& Quot; (3 ) & quot ;

은 송신 안테나(120)와 수신 안테나(210) 사이의 채널을 의미하고,

는 n 번째 시간슬롯에 해당하는 잡음벡터를 의미한다. 잡음 벡터에서 각

는 i 번째 수신 안테나에서의 평균값이 0이고 파워가

인 AWGN(Additive White Gaussian Noise)을 의미한다. here,

Means a channel between the transmitting antenna 120 and the receiving antenna 210,

Denotes a noise vector corresponding to the n th time slot. Angle in noise vector

The average value at the i th receive antenna is 0 and the power is

AWGN (Additive White Gaussian Noise).

인 것으로 하여 설명하도록 한다. 이를 이용하면 상기 수학식 3은 하기의 수학식 4와 같이 표현될 수 있다.In the present invention, for convenience of description, channel information between the transmitting device 100 and the receiving device 200.

It will be described as. Using this, Equation 3 may be expressed as Equation 4 below.

& Quot; (4 ) & quot ;

은 포워드 필터에 통해 출력되며, 포워드 필터를 통해 출력된 신호는 피드백 필터의 출력신호에 의해 감산되어 수신측 IEST 수행부로 전달된다. 포워드 필터 및 피드백 필터에 대해서는 이후 상세하게 설명하도록 한다.Signals received from the detector 221 to each receive antenna 210

Is output through the forward filter, and the signal output through the forward filter is subtracted by the output signal of the feedback filter and transferred to the receiver IEST execution unit. The forward filter and the feedback filter will be described in detail later.

The receiver IEST execution unit 222 performs inverse transform, that is, demodulation, on the signal output from the detector 221 based on the EST.

The determination unit 223 determines the symbol level of the output signal of the receiving side IEST execution unit 222. According to a preferred embodiment of the present invention, the determination unit 223 may determine which signal is the signal input to the transmitting side EST execution unit 112 in consideration of the signal passed through the IEST execution unit 222 by the softness determination. have. The soft decision method is more desirable to prevent error propagation at low signal-to-noise ratios.

The symbol delay unit 224 delays the signal determined by the determination unit 223 to a predetermined time.

The receiving side EST execution unit 225 modulates the signal output to the symbol delay unit 224 based on the EST. The modulated signal is fed back to the detector 221.

Referring to FIG. 2, the receiver IEST performer 222, the determiner 223, the symbol delay unit 224, and the receiver EST performer 225 form a loop as described above. The preset number is repeated. Therefore, the forward filter and the feedback filter designed by the detector 221 may be updated by a predetermined loop, and as the loop is repeated, a signal to interference plus signal to interference ratio of the signal determined by the determiner 223 is repeated. Noise Ratio (SINR) is increased.

를 추정하고 추정된 채널정보

를 수신측 전송부(230)로 전달한다.Channel estimator 226 is a channel information between the transmitter and the receiver

Estimate the estimated channel information

It is transmitted to the receiving side transmission unit 230.

를 신호 처리부(114)로 전송한다.The receiver side transmitting unit 230 receives channel information received from the channel estimating unit 226.

Is transmitted to the signal processor 114.

의

을 최대화하도록 설계될 수 있다. 여기서

은 루프 인덱스,

는 안테나 인덱스를 의미한다.According to an embodiment of the present invention, the forward filter and the feedback filter for each of the reception antennas 210 included in the detector 221 are determined by the determination unit 223 every loop.

of

Can be designed to maximize. here

Is the loop index,

Means antenna index.

을 최대화하도록 설계되는 상기의 포워드 필터와 피드백 필터에 대해 도 3을 참조하여 상세하게 설명하도록 한다.In the following,

The forward filter and the feedback filter, which are designed to maximize, will be described in detail with reference to FIG. 3.

3 is a block diagram showing a detailed configuration of a detector according to an embodiment of the present invention.

Referring to FIG. 3, the detector 221 includes a channel recognizer 301, a distortion power measurer 303, a time delay unit 305, a signal power measurer 307, a noise power measurer 309, and interference. The power measurer 311, the filter design unit 313, the forward filter 315, and the feedback filter 317 may be included.

를 인식하고, 이 채널 정보를 신호파워 측정부(307), 잡음파워 측정부(309), 간섭 파워 측정부(311)로 각각 전달한다.The channel recognizer 301 receives channel information received from the channel estimator 226.

The channel information is transmitted to the signal power measuring unit 307, the noise power measuring unit 309, and the interference power measuring unit 311, respectively.

을 이용하여 왜곡 파워를 측정하고 이를 간섭 파워 측정부(311)로 전달한다.The distortion power measurement unit 303 is a total amount of power consumed by the transmission delay antenna 120 and the signal delayed by the symbol delay unit 224 in the previous iteration.

Measures the distortion power using and transfers it to the interference power measurement unit 311.

의 신호 파워를 측정하고 필터 설계부(313)로 전달한다.The signal power measuring unit 307 determines the signal determined by the determining unit 223 in the previous iteration.

The signal power of the signal is measured and transmitted to the filter design unit 313.

의 잡음 파워를 측정하고 필터 설계부(313)로 전달한다.The noise power measurement unit 309

The noise power is measured and transmitted to the filter design unit 313.

의 간섭 파워를 측정하고 필터 설계부(313)로 전달한다.The interference power measuring unit 311

Measure the interference power and transmit it to the filter design unit 313.

The power measured by the signal power measuring unit 307, the noise power measuring unit 309, and the interference power measuring unit 311 may be expressed by Equation 5 below.

& Quot; (5 ) & quot ;

는

번째 루프에서

번째 스트림에 대한 간섭 파워,

번째 루프에서

번째 스트림에 대한 간섭 파워

는

번째 루프에서

번째 스트림에 대한 잡음 파워,

는

번째 루프에서

번째 스트림을 위한 포워드 필터,

는

의

번째 성분,

는

번째 루프에서 왜곡파워 측정부(303)에 의해 측정된

번째 스트림에 대한 왜곡파워를 의미한다.

,

,

에 대한 자세한 설명은 본 발명자에 의해 발표된 논문 "T. Hwang "Multiple access with energy spreading transform,"IEEE Signal Process. Lett. vol. 15, no. 2, pp 225-153, 2008" 로부터 획득할 수 있을 것이다.here,

The

In the first loop

Interference power for the first stream,

In the first loop

Interference power for the first stream

The

In the first loop

Noise power for the first stream,

The

In the first loop

Forward filter for the first stream,

The

of

Th ingredient,

The

Measured by the distortion power measurement unit 303 in the first loop

Distortion power for the first stream.

,

,

A detailed description can be obtained from the article "T. Hwang" Multiple access with energy spreading transform, "IEEE Signal Process. Lett. Vol. 15, no. 2, pp 225-153, 2008, published by the inventor. There will be.

의

을 예측하고, 예측된

을 최대화하도록 하는 포워드 필터(315) 및 피드백 필터(317)를 설계한다. 여기서,

은 수학식 6에 따라 예측될 수 있다.The filter design unit 313 uses the powers transmitted from the signal power measuring unit 307, the noise power measuring unit 309, and the interference power measuring unit 311 to determine the signal determined by the determination unit 223 in the previous iteration.

of

Predict the

The forward filter 315 and the feedback filter 317 are designed to maximize. here,

Can be predicted according to equation (6).

& Quot; (6 ) & quot ;

은

번째 루프에서

번째 스트림에 대한 SINR을 의미한다.here,

silver

In the first loop

Mean SINR for the first stream.

을 최대화하는 포워드 필터(315)를 설계할 수 있다. 이는 하기의 수학식 7과 같이 설계될 수 있다.Subsequently, the filter design unit 313 uses the distortion power and channel information between the transmitter 100 and the receiver 200.

The forward filter 315 can be designed to maximize. This may be designed as shown in Equation 7 below.

& Quot; (7 ) & quot ;

는

의

번째 열 벡터를 의미하고,

는

에는 영향을 주지 않는 스케일링 요소이다. here,

The

of

Means the second column vector,

The

It is a scaling factor that does not affect.

The filter design unit 313 may design the feedback filter 317 using the channel information and the forward filter 315 between the transmitter 100 and the receiver 200 as shown in Equation 8 below.

& Quot; (8 ) & quot ;

는

번째 성분만 1이고 나머지 성분들은 0인 크기가 1인 벡터이다.here,

The

Only the first component is 1 and the remaining components are vectors of size 1 with 0.

은 수학식 7에 표현된 포워드 필터(315)를 통해 처리되고, 수학식 8에 표현된 피드백 필터(317)의 출력신호에 의해 감산된

신호가 수신측 IEST 수행부(222)로 전달된다.To summarize the signal processing method performed by the detector 221, the signal received from the receiving antenna 210

Is processed by the forward filter 315 represented by Equation 7, and subtracted by the output signal of the feedback filter 317 represented by Equation 8.

The signal is transmitted to the receiving IEST execution unit 222.

According to the present invention, BER performance can be improved by transmitting the transmission signal to the reception apparatus 200 by preprocessing the transmission signal to minimize the BER of the multi-antenna spatial multiplexing system. In addition, by processing the received signal through the forward filter 315 and the feedback filter 317 designed to maximize the SINR in the receiving device 200, there is an advantage that can efficiently transmit and receive a plurality of data while having a low complexity.

4 is a flowchart illustrating a signal processing method of a transmitting apparatus in an EST based multi-antenna spatial multiplexing communication system according to an embodiment of the present invention.

First, in step S400, the transmitting apparatus converts the EST for signals to be transmitted from the plurality of transmitting antennas, respectively.

Next, in step S405, a transmission filter for minimizing the BER of the multi-antenna spatial multiplexing communication system is designed using channel information between the transmitting device and the receiving device.

According to an embodiment of the present invention, the channel information may be received from the receiving device.

Finally, in step S410, the signal modulated in step S400 is processed and transmitted to the plurality of transmit antennas using a transmission filter.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art, various modifications and variations are possible from these descriptions. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: transmitter 110: transmitter side control unit
112: transmitting side EST execution unit 114: signal processing unit
120: transmit antenna
200: receiving device 210: receiving antenna
220: receiver side controller 230: receiver side transmitter
221: detector 222: receiver IEST execution unit
223: determination unit 224: symbol delay unit
225: receiving side EST performing section 226: channel estimating section
301: channel recognition unit 303: distortion power measurement unit
305: time delay unit 307: signal power measurement unit
309: noise power measurement unit 311: interference power measurement unit
313: filter design unit 315: forward filter
317: feedback filter

Claims (15)

A plurality of receive antennas;
A detector detecting a signal received from the plurality of antennas;
An IEST performer for performing EST inverse transform on the signal of the detector;
A determination unit that determines a symbol level of an output signal of the IEST execution unit;
A symbol delay unit for delaying the signal determined by the determination unit to a predetermined time; And
Including an EST performing a EST conversion on the signal output from the symbol delay unit to feed back to the detection unit,
The detector designs a forward filter and a feedback filter to maximize the interference and noise of the signal determined in the previous iteration, detects the received signal using the forward filter and the feedback filter,
Wherein:
A measuring unit measuring signal power, noise power and interference power of the signal determined by the determining unit in the previous iteration; And
A filter design unit for predicting interference and noise relative to the signal using the signal power, interference power, and noise power, and designing the forward filter and the feedback filter to maximize the predicted interference and noise,
The filter design unit designs the feedback filter using the estimated channel information between the transmitting device and the receiving device and the forward filter, and the feedback filter is designed using the following equation. Receiving apparatus in a multiplexed communication system.

here,

The

In the third iteration

Filter for the signal of the first antenna,

Denotes a vector of size 1, where only the i th component is 1 and the remaining components are 0.
The method of claim 1,
And the determining unit performs symbol level determination by a soft decision. delete The method of claim 1,
The filter design unit maximizes the interference and noise compared to the predicted signal using the estimated power and the distortion power measured by using the total amount of the signal delayed by the symbol delay unit and the power consumed by the transmission apparatus. A receiving device in an EST based multi-antenna spatial multiplexing communication system, characterized by designing a forward filter. delete 5. The method of claim 4,
The forward filter is a receiving device in an EST-based multi-antenna spatial multiplexing communication system, characterized in that designed using the following equation.

here,

The

In the third iteration

Forward filter for the signal of the first antenna,

Is channel information between a transmitter and a receiver

I th column vector of,

Is a scaling factor that does not affect the signal-to-interference signal,

Is the distortion power,

Are the noise vectors at the antenna, respectively. delete The method of claim 1,
The signal fed back from the EST execution unit is processed through the feedback filter,
The signals received from the plurality of antennas are processed through the forward filter, and the signals processed through the forward filter are subtracted by the signal processed through the feedback filter and input to the IEST execution unit. A receiving device in a multi-antenna spatial multiplexing communication system. The method of claim 1,
The signal received from the plurality of antennas is an EST-based signal that is processed through a transmission filter that minimizes a bit error rate of a receiving device in the EST-based multi-antenna spatial multiplexing communication system in a transmitting device A receiving device in a multi-antenna spatial multiplexing communication system. 10. The method of claim 9,
The transmitting device receives the estimated channel information between the transmitting device and the receiving device from the receiving device, and design the transmission filter using the estimated channel information, EST based multi-antenna spatial multiplexing communication system Receiving device at. The method of claim 1,
And the detector repeats and updates the design of the forward filter and the feedback filter by a predetermined loop, in the EST-based multi-antenna spatial multiplexing communication system. A transmission apparatus in an EST based multiple antenna spatial multiplexing communication system,
A plurality of transmit antennas;
A transmitting side EST performer coupled to each of the plurality of transmitting antennas to perform EST conversion on signals to be transmitted from the plurality of transmitting antennas; And
Design a transmission filter that minimizes the BER (Bit Error Rate) of the multi-antenna spatial multiplexing system by using channel information between the transmitting device and the receiving device, and transmits the signal output from the transmitting EST execution unit through the transmitting filter. Signal processing unit for processing and transmitting to the plurality of transmit antennas,
The signal processor receives channel information between the transmitter and the receiver from the receiver,
The transmission filter is a transmission device in an EST-based multi-antenna spatial multiplexing communication system, characterized in that designed as follows.

here,

Is the transmission filter,

The channel information

Right singular matrix of,

Is the size of each component

Unitary matrix,

Denotes the number of transmit antennas, respectively.

delete delete delete

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