KR100630380B1 - Apparatus for providing multiple input and multiple output in digital multimedia broadcasting system and method of the same - Google Patents

Abstract

Disclosed are a multi-transmitter and a method in a digital multimedia broadcasting system. The antenna array is composed of a plurality of antenna stages composed of a plurality of antennas, and receives a phase reference symbol signal and a data signal of a predetermined format converted to inverse fast free. The window setting unit sets a window having a predetermined width for each antenna to maintain orthogonality with the channel impulse response on the time axis. The channel estimator estimates a channel based on the phase reference symbol signal inside the set window. The signal detecting unit subtracts the regenerated signal using the channel information estimated for the j-th antenna of the j-1 th stage from the received signals of all the i th antennas of the j th stage and the j-1 th stage The added signal calculated by adding the re-generated signal using the estimated channel information for the i th antenna of the < RTI ID = 0.0 > is < / RTI > The data symbol for the i th antenna of the j th stage is detected by the decision variable. According to the present invention, it is possible to reduce the interference caused by signals of different paths, so that it is possible to effectively reduce the decoding delay while greatly reducing the complexity of hardware regardless of the number of transmit antennas and the dB value in the digital multimedia system, thereby stably Can be detected.

Description

Apparatus for providing multiple input and multiple output in digital multimedia broadcasting system and method of the same}

1 is a block diagram showing a configuration of a receiving end in a multiple transceiver of a digital multimedia broadcasting system according to the present invention;

2 is a flowchart illustrating a process of performing a multiplexing method of a digital multimedia broadcasting system according to the present invention;

3 shows a transmission frame structure in an OFDM-based DMB system.

4 illustrates a rectangular window function designed to maintain orthogonality with the channel impulse response for each antenna in the time axis;

5 is a diagram showing the basic structure of a circuit to which a series interference cancellation technique is applied;

6 is a diagram illustrating the basic structure of a circuit to which a parallel interference cancellation technique is applied;

7 is a view showing the basic structure of a circuit to which the hybrid detector method according to the present invention is applied;

8 is a diagram showing the structure of an NRU in the j th stage of an i th antenna;

9 is a graph showing MSE performance of LS and LMMSE estimation schemes on a multipath channel;

10 is a graph showing the BER performance in the case of considering the power order of magnitude, and

11A to 11C are graphs showing simulation results of the hybrid detector method.

The present invention relates to a multiplexing device and method in a digital multimedia broadcasting (DMB) system using an orthogonal frequency division multiplexing (OFDM) scheme. The present invention relates to an apparatus and method for estimating channel information at a receiver by transmitting a phase reference symbol (PRS) and detecting a signal using a hybrid subtraction cancellation scheme.

In order to apply multiple input multiple output digital multimedia broadcasting (MIMO-DMB) to an OFDM system, channel estimation is necessary. Therefore, the OFDM system modulates the signal after transmitting the PRS to the multiple transmit antennas of the transmitter, and the receiver acquires the channel information from the PRS, and then demodulates the original signal by demodulating the modulated signal by removing the influence of the channel from the received signal. Play it. On the other hand, channel estimation is necessary to apply multiple input multiple output digital multimedia broadcasting (MIMO-DMB) to an OFDM system. To this end, existing multiple transceivers use a serial or parallel cancellation scheme for interference cancellation.

The serial interference elimination method arranges received signal powers in large order to determine the signal with the highest power, multiplies the estimated received signal by the channel parameter, reconstructs the transmitted signal, and subtracts the reconstructed signal from the existing received signal. The serial interference elimination method has the advantage of excellent performance and simple structure, but has a disadvantage in that the time delay is proportionally increased as the number of antennas increases because the signal having the weakest power is subtracted step by step.

On the other hand, the parallel interference cancellation technique removes all interference signals except the desired signal from the received signal at the same time. The parallel interference cancellation technique removes all other user interference at once, so that all interference cancellation can be done with only a few bits of time delay, but the channel environment changes so fast that the performance of previous stages of interference cancellation is poor. There is a problem in that the overall performance tends to worsen in some cases (i.e., when the bits of other signals initially determined are wrongly determined). In addition, since the parallel interference cancellation technique needs to process all antenna signals simultaneously, the complexity of the system increases exponentially as the number of users increases, making it difficult to implement the system and increasing the execution time.

 SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a multi-receiving apparatus and method in a digital multimedia broadcasting system capable of efficiently eliminating interference by multipath and increasing the capacity of a digital multimedia broadcasting system.

In order to achieve the above technical problem, in the digital multimedia broadcasting system according to the present invention, the multiplexed transmission / reception device is composed of a plurality of antenna stages composed of a plurality of antennas, and a phase reference symbol signal and a data signal of a predetermined format converted to inverse high-speed free. An antenna array for receiving; A window setting unit configured to set a window having a predetermined width for each antenna to maintain orthogonality with a channel impulse response on a time axis; A channel estimating unit estimating a channel based on the set phase reference symbol signal in the window; And the j-1 th stage and the interference cancellation signal generated by subtracting the regenerated signal using the estimated channel information for all j th antennas of the j-1 th stage from the received signal of the i th antenna of the j th stage. The added signal calculated by adding the re-generated signal using the estimated channel information for the i th antenna of the i is zeroed by the zeroing vector of the i th antenna of the j th stage, and generated based on the zeroed addition signal. And a signal detector for detecting data symbols for the i th antenna of the j th stage by a predetermined decision variable.

In the digital multimedia broadcasting system according to the present invention, a multiplex transmission and reception method according to the present invention provides a phase reference symbol signal of a predetermined format converted into an inverse fast free signal by an antenna array having a plurality of antenna stages composed of a plurality of antennas. And receiving a data signal; Setting a window having a predetermined width for each antenna to maintain orthogonality with a channel impulse response in the time axis; Estimating a channel based on a phase reference symbol signal inside the set window; generating an interference cancellation signal by subtracting the regenerated signal using the estimated channel information for all j-th antennas of the j-th stage from the received signal of the i-th antenna of the j-th stage; Zeroing the addition signal calculated by adding the regenerated signal using the estimated channel information with respect to the i th antenna of the j-1 th stage by the zeroing vector of the i th antenna of the j th stage; And detecting a data symbol for the i th antenna of the j th stage based on a predetermined decision variable generated based on the zeroed addition signal.

This improves the performance of digital multimedia broadcasting system by effectively increasing the signal transmission rate and the reliability of signal detection, and improves the performance by increasing the number of antennas, thereby increasing the capacity of digital multimedia broadcasting system with stable signal detection. can do.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a multiple transceiver and method in a digital multimedia broadcasting system according to the present invention.

1 is a block diagram showing the configuration of a receiver in a multiple transceiver of a digital multimedia broadcasting system according to the present invention, and FIG. 2 is a flowchart illustrating a process of performing a multiplex transmission and reception method of a digital multimedia broadcasting system according to the present invention.

1 and 2, the multi-transmitter / receiver 100 of the digital multimedia broadcasting system according to the present invention includes an antenna array 110, a signal processor 120, a window setup unit 130, and a channel estimator 140. , And a signal detector 150.

The antenna array 110 is composed of a plurality of antenna stages composed of a plurality of antennas. The signal processor 120 converts the PRS signal to inverse high speed free (S200). The PRS signal is an orthogonal frequency division multiplexed modulation signal having a phase reference signal of a new structure. The PRS signal is a signal for estimating channel information at a receiver and detecting a signal using a hybrid subtraction method. The transmitting end transmits a phase reference symbol signal and a data signal of a predetermined format, which are converted to inverse fast free, through the antenna array 110 (S210). At this time, the transmitter transmits the PRS signal by dividing the PRS signal according to the number of transmit antennas and through each antenna provided in the antenna array 110.

The receiving end receives a PRS signal and a data signal through each antenna provided in the antenna array 110 (S220). The window setting unit 130 of the receiving end sets a window having a predetermined width with respect to the PRS signal converted into the received inverse fast free (S230). The channel estimator 140 of the receiving end estimates channel information based on the signal inside the set window (S240). The signal detecting unit 150 of the receiving end detects the received signal while minimizing the detection error by the optimal power sequence method using the estimated channel, adds the detected received signal and the regenerated signal, and zeros the optimal zeroed vector. The data signal is detected from the received signal by performing the regeneration process (S250). The signal detecting unit 150 subtracts the interference signal generated by subtracting the regenerated signal using the channel information estimated for all jth antennas of the j-1th stage from the received signal of the ith antenna of the jth stage and j. Based on the zeroed vector of the i-th antenna of the j-th stage, the added signal calculated by adding the re-generated signal using the estimated channel information for the i-th antenna of the -1th stage is zeroed, and based on the zeroed addition signal. The data symbol for the i th antenna of the j th stage is detected by the generated predetermined decision variable.

The multiple transceiver 100 having the above-described configuration may be provided with a transmitting end and a receiving end alone. In this case, the antenna terminal 110 and the signal processor 120 are provided at the transmitting end, and the antenna array 110 and other components are provided at the receiving end. As a result, in the digital multimedia system, regardless of the number of transmission antennas and the dB value, the decoding delay can be efficiently reduced while the complexity of hardware is greatly reduced, so that the signal can be stably detected.

On the other hand, in a multiple transmission channel environment in which the multiple transceiver 100 according to the present invention operates, a PRS structure for effective channel separation and channel estimation is required. 3 shows the structure of a transport frame. If X _i (k) is the frequency axis coefficient for the PRS pattern of the i th transmission antenna, x ₁ (n) is the result of converting the PRS pattern X ₁ (k) of the first transmission antenna to inverse fast free. . The relationship between x ₁ (n) and X ₁ (k) can be expressed by the following equation.

Where n is the time-base coefficient of the OFDM symbol and n _i is the time-shifted coefficient in the i-th PRS pattern. If x ₁ (n + n _i ) is represented by x _i (n), the PRS pattern for the i th transmit antenna is represented by the following equation.

Where x _i (n) is expressed as follows.

The number K of subcarriers in data modulation and the number N _t of maximum transmit antennas for a channel response having a length of λ can be derived by the following equation.

이다. 한편, N_t개의 다중 전송 안테나에 대한 시간 천이 인덱스 n_i는 다음의 수학식에 의해 얻어진다.here,

to be. On the other hand, the time transition index n _i for N _t multiple transmit antennas is obtained by the following equation.

For each transmit antenna i, it is assumed that the transmitted OFDM symbol passes through the multipath channel with the model with a channel impulse response as shown in the following equation before reaching the jth receive antenna.

는 l번째 경로 이득이며,

는 l번째 경로의 시간 지연이다. 다중경로 채널을 통과한 후에, 수신기 j에 수신된 OFDM 심벌에 대한 시간축 수신 심벌은 다음의 수학식과 같다.here,

Is the l-th path gain,

Is the time delay of the l-th path. After passing through the multipath channel, the time-base received symbol for the OFDM symbol received at receiver j is given by the following equation.

는 K-point 원형 컨볼루션을 나타내고, n_j(n)은 평균이 0이고 분산

을 갖는 백색 가우시안 잡음(Additive White Gaussian Noise : AWGN) 심벌을 나타낸다. 위의 수신 신호에 대하여 사각 원도우 함수

과 수신된 신호 r_j(n)의 곱을 통하여 각각의 전송 신호를 분리해 내면 다음의 수학식과 같다.here,

Denotes a K-point circular convolution, where n _j (n) is zero with mean and variance

It represents a white Gaussian Noise (AWGN) symbol. Rectangular window function for the received signal

And each transmission signal is separated by multiplying the received signal r _j (n) by the following equation.

는 i번째 사각 윈도우 함수를 나타내고, 이는 해당 윈도우의 크기만 1의 값을 가지는 다음과 같은 수학식으로 정의된다.here,

Represents an i-th rectangular window function, which is defined by the following equation in which only the size of the corresponding window has a value of 1.

4 is a diagram illustrating a rectangular window function designed to maintain orthogonality with a channel impulse response for each antenna on the time axis. In order to express the signal of the transmitter, N _t K-dimensional transmission signal vectors are defined as follows.

Using the design criteria derived as shown in Equation 10, the PRS signal X _i transmitted from the i th transmit antenna is formed according to the following equation.

를 가지는 K×K diagonal 행렬이며, F는 K×K 고속 프리에 변환(Fast Fourier Transform, FFT) 행렬을 나타낸다. Where e _i is an element

Is a K × K diagonal matrix with F denotes a K × K fast Fourier transform (FFT) matrix.

The transmission pattern on the time axis of the PRS signal defined above is represented by an impulse. Where channel conditions are ideal, PRS signals designed to have orthogonality on the time or frequency axis exhibit the same channel estimation performance.

In general, a channel in a multiple transmit / receive antenna system is assumed to be a frequency fading channel in a wireless environment. Performance degradation in multi-antenna systems is mainly due to interference from data in other paths. Therefore, the influence of the interference signal can be mitigated by removing signals of different paths from each receiving antenna. However, to remove interference signals, it is necessary to know channel information of all paths and transmitted signals. Removing from the received signal with inaccurate information signals causes error propagation. However, in the case where the influence of the interference signals is dominant in the system performance, the interference signal cancellation can improve the performance.

Subtractive Interference Cancellation is used to remove the interference signal. Subtractive interference cancellation is a method of reducing interference between multiple signals by subtracting all interference components caused by other path signals from a received signal before determining signal bits for each transmission antenna. In addition, all the interference cancellation schemes show good performance even when the power distribution between signals is constant or not. Subtractive interference cancellation is divided into two types: serial interference cancellation (SIC) and parallel interference cancellation (PIC). In the serial interference cancellation technique, the received signal power of each antenna is arranged in the power ordering, the first to the largest are detected, and then the interference cancellation is performed. This serial interference cancellation scheme shows good performance in multipath fading environment, but has a disadvantage of high decoding delay when configured in multiple stages. On the other hand, the parallel interference cancellation scheme has a problem that performance in a multipath fading environment does not meet expectations because the decoding delay is small even in the case of multiple stages, but the interference cancellation is performed without considering the magnitude of the received signal power. .

Therefore, we propose a hybrid detection method for nulling and cancellation of interference as a method for detecting signals by taking advantage of the serial and parallel structures in the MIMO-DMB structure. Hybrid architecture can reduce the decoding delay without increasing BER at the expense of hardware complexity. In addition, the multi-path fading characteristic of the tandem structure can be maintained.

5 shows the basic structure of a serial interference cancellation technique. The basic algorithm of the serial interference elimination method arranges the received signal power in order of big order to determine the signal with the highest power, and then multiplies the estimated received signal by the channel parameter to reconstruct the transmitted signal and subtracts the reconstructed signal from the existing received signal. It is. That is, interference cancellation is performed on the received signal. Through the above steps, the received signal after subtracting the interference signal having the largest output power finds the signal having the largest power again. The signal is decoded and subtracted from the received signal again. This process is repeated until the signal with the weakest power is determined.

As described above, the serial interference elimination method is superior in performance but simpler in structure than the parallel method, and its complexity increases in proportion to the number of antennas, and incomplete power control is performed in an environment where the channel environment changes rapidly. Even better performance than parallel type. However, since the signal with the weakest power is subtracted step by step, there is a disadvantage that a time delay occurs in proportion to the number of antennas.

6 shows the basic structure of a parallel interference cancellation technique. The parallel interference cancellation technique removes all interference signals except the desired signal from the received signal at the same time. That is, in the previous step, the signal of each antenna is multiplied by the respective channel parameter to reconstruct the transmission signal, and then all interference signal components (other transmission signals except itself) are subtracted from the reception signal. This parallel interference cancellation technique removes all other user interference at once, so that all interference cancellation can be accomplished with only a few bits of time delay.

However. The problem with parallel interference cancellation is that the overall performance tends to be poor if the channel environment changes so rapidly that the performance of the previous stage of interference cancellation is poor, i.e., if the bits of other signals initially determined are incorrectly determined. It seems true. In addition, since the parallel interference cancellation technique needs to process all antenna signals at the same time, the complexity of the system increases exponentially as the number of users increases, making the actual implementation difficult and increasing the execution time.

FIG. 7 is a diagram illustrating a basic structure of a circuit implementing a hybrid detection technique, and FIG. 8 is a diagram illustrating a structure of an NRU at the j-th end of an i-th antenna.

Referring to FIGS. 7 and 8, received signals of the antennas are arranged in order of increasing power. The rearranged signals from the first antenna to the j th antenna are subtracted from the received signal r ⁰ (l) at time l.

은 (j-1)번째 단에서 k번째 안테나의 재발생된 신호이다. 이것은 PRS 신호를 기초로 추정된 채널의 정보를 사용하여 재발생되어진 것이다. j번째 단에서 모든 안테나의 NRU(Nulling-and-Regeneration Unit)입력에 대해서 간섭이 제거된 신호는 수학식 13에 의해 얻어진다. 수학식 13에 의하면, 혼성신호를 얻기 위해 이전 단에서 i번째 안테나의 재발생 신호

이 간섭 제거된 신호

에 더해진다.here,

Is the regenerated signal of the k th antenna in the (j-1) th stage. This is regenerated using the information of the channel estimated based on the PRS signal. In the j-th stage, the interference canceled signal for the NRU input of all antennas is obtained by Equation 13. According to Equation 13, the regenerating signal of the i th antenna in the previous stage to obtain the mixed signal

This interference canceled signal

Is added to

는 더욱 깨끗한 재발생을 위해서 j<N_t때까지 다음 단으로 향한다. 반면, j=N_t일 경우에 결정 변수는 마지막 비트 결정 장치로 향한다. The mixed signal is zeroed by the zeroing vector of the corresponding antenna and passed to the decision block. Thus, in the hybrid technique, the NRU is used as a projection for the received signal of the corresponding antenna. Finally, determinant

Is directed to the next stage until j <N _t for cleaner regeneration. On the other hand, when j = N _t , the decision variable is directed to the last bit decision device.

Next, the delayed detection process is performed, and the delayed version of the received signal is subtracted from the signals of all other antennas except for the signal of the determined antenna. This hybrid detection process continues until the interference cancellation stage is maximized. The signal r ^j (l) received in the conventional serial detection technique subtracts only one signal regenerated at the j th antenna at every stage. However, the hybrid detection technique subtracts all regenerated signals from the first to jth antennas in all stages.

에 대해서 그에 대응하는 N_r×1 수신 벡터는 다음의 수학식과 같다.Data symbol transmitted at time t N _t × 1 vector

The corresponding N _r × 1 received vector is given by the following equation.

는 각 성분

를 가진 다경로 채널벡터이고,

는 분산

를 가진 AWGN벡터이다.here,

Is each ingredient

Is a multipath channel vector with

Distributed

AWGN vector with

의 minimum-norm열의 선택에 의해 최적의 전력나열법을 사용할 수 있다. 여기서,

는 pseudo-inverse를 의미한다. 전송 심벌을 최적의 나열법을 이용해 나열하면

이다.Next, sequential detection is performed for each element of x , i = 1, 2,... , It is not necessary to detect each element x _i in the order of N _t . As a result, an optimal power sequence was used to minimize detection errors. Meanwhile,

By selecting the minimum-norm column, we can use the optimal power sequence method. here,

Means pseudo-inverse. If you list the transmitted symbols using the optimal sequence,

to be.

를 검출하기 위해, Zero-Forcing nulling 기법을 실시하고, minimum-norm 가중치 벡터

를 다음과 같은 조건이 만족하도록 찾는다.Next, the first element of x

To detect this problem, we implement a zero-forcing nulling technique and apply a minimum-norm weight vector.

Find to satisfy the following conditions.

는 complex conjugate를 의미한다. 가중치 벡터

는 h의 pseudo-inverse를 통해서 이루어지므로, h의 추정치인

을 통해 가중치 벡터를 얻으면 다음과 같다.here,

Means complex conjugate. Weight vector

It is therefore achieved through a pseudo-inverse of h, the estimate of h

The weight vector is obtained as follows.

이고,

는 h의 열들

를 제로값으로 하여 얻어지는 행렬이다.here,

ego,

Are the columns of h

It is a matrix obtained by making zero as.

가 제거된 수신 벡터 r ^j는 다음과 같다.Interference between signals when the i th symbol is detected

The reception vector r ^j from which is removed is as follows.

가 검출오류가 없다고 가정한다면 수학식 17은 다음과 같이 표현할 수 있다.

Assuming that there is no detection error, Equation 17 can be expressed as follows.

,

, 그리고,

이다.Where each coefficient

,

, And,

to be.

이라면, 수학식 18의 제로화 벡터

은 최적의 제로화 벡터이지만, 실제 시스템에서는

이 아니므로

은 최적의 제로화 벡터가 아니다.if,

, Then zeroing vector of Equation 18

Is the optimal zeroing vector, but in a real system

Is not

Is not the optimal zeroing vector.

는 다음의 수학식과 같다.Hereinafter, a new zeroing vector will be described to minimize the influence of the channel estimation error. New zeroing vector, without common decay

Is equal to the following equation.

는 원래의 제로화 벡터

과 새로운 제로화 벡터

사이의 차이이다. 새로운 제로화 벡터를 가지고, 새로운 검출 통계와

의 추정값을 얻는다.here,

Original zeroing vector

And new zeroing vector

Is the difference between. With new zeroing vectors, with new detection statistics

Get an estimate of.

Here, Q (·) means a quantization function suitable for the constellation to be used.

9 is a graph showing MSE performance of LS and LMMSE estimation schemes on a multipath channel. At low SNR, the two estimation methods show similar MSE performance except that the LMMSE estimation method has a very small gain over the LS method.

10 is a graph showing the BER performance with and without considering the power order. The BER performance curve when power order is taken into account differs from the BER curve when power order is not taken into account as the number of transmission antennas increases. This is because the probability distribution of the received SNR at high SNR is proportional to the number of antennas. Therefore, high reliability can be provided.

의 pseudo-inverse 행렬을 얻기 위해 사용되는 행의 총 수는 직렬식, 병렬식, 그리고 하이브리드 기법이 각각 N_t(N_t+1)/2, N_t(N_t+1), 그리고, N _t(N_t+1)(N_t+2)/6이다. 예를 들어, N_t=N_r=4인 경우를 비교해 보면, 하이브리드 기법의 사용되는 행의 총수는 병렬식 검출기법과 같고, 직렬식 검출기법에는 2배이다.11A, 11B, and 11C are graphs showing simulation results of the hybrid detector method in the MIMO-DAB system. 11B shows the BER performance results for the MIMO-DMB system with 4 transmit / receive antennas. The hybrid detector method has performance improvements of 2 dB and 7 dB, respectively, for the conventional serial and parallel types when the BER is 10 ^-3. come. In addition, according to the results shown in FIGS. 11A to 11C, in the case of N _t = 2, the parallel detection technique of the MIMO-DMB system is significantly better than the performance of the conventional serial detector method, but in the case of N _t > 2. The performance is noticeably worse. In addition, the serial and parallel detectors perform N _t and 2N _t zeroing operations, respectively, and the hybrid detector method performs N _t (N _t +1) / 2 zeroing operations, which means additional complexity. On the other hand,

The total number of rows used to obtain the pseudo-inverse matrix is N _t (N _t +1) / 2, N _t (N _t +1), and N _{t, respectively.} (N _t +1) (N _t +2) / 6. For example, comparing the case where N _t = N _r = 4, the total number of rows used in the hybrid technique is the same as the parallel detector method and twice the tandem detector method.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

According to the multiplexed transmission and reception apparatus and method in a digital multimedia broadcasting system according to the present invention, by using a new phase reference signal and estimating a channel and applying a power size ordering technique, the digital transmission system effectively increases the signal transmission rate and the reliability of signal detection. The performance of the multimedia broadcasting system can be improved, and the performance of the multimedia broadcasting system can be increased by increasing the number of antennas, thereby increasing the capacity of the digital multimedia broadcasting system with stable signal detection.

Claims (8)

(a) an antenna array composed of a plurality of antennas for transmitting and receiving a phase reference symbol signal and a data signal of a predetermined format converted into inverse fast free; (b) a transmitter for transmitting the phase reference symbol signal and the data signal converted into the inverse fast free signal through the antenna array; (c) a window setting unit configured to set a window having a predetermined width to maintain orthogonality with a channel impulse response on a time axis with respect to the phase reference symbol signal and the data signal received through each antenna of the antenna array; A channel estimating unit estimating a channel based on the set phase reference symbol signal in the window; And the j-1 th stage and the interference cancellation signal generated by subtracting the regenerated signal using the estimated channel information for all j th antennas of the j-1 th stage from the received signal of the i th antenna of the j th stage. The added signal calculated by adding the re-generated signal using the estimated channel information for the i th antenna of the i is zeroed by the zeroing vector of the i th antenna of the j th stage, and generated based on the zeroed addition signal. And a receiver comprising a signal detector for detecting data symbols for the i-th antenna of the j-th stage by a predetermined decision variable. The method of claim 1, The phase reference symbol signal r _j (n) received by each antenna satisfies the following equation;

here,

Denotes a K-point circular convolution, where n _j (n) is zero with mean and variance

Additive White Gaussian Noise (AWGN), where N _t is the maximum number of transmit antennas for the channel response of the subcarrier in data modulation, and h _ij (n) is the i th transmit antenna to the j th receive antenna. X _i (n) denotes the n th subsymbol transmitted in the i th transmission antenna of the phase reference symbol signal. The method of claim 1, Wherein the channel estimator estimates a channel by applying the following equation to the received phase reference symbol signal and the window:

here,

Denotes a window function corresponding to the i-th window, n _i denotes a position where an impulse is added to a phase reference symbol signal transmitted from each transmit antenna, and K denotes the number of subcarriers. The method of claim 1, Before performing the process of generating the interference cancellation signal, the signal detection unit arranges the received signals of each antenna constituting the antenna array based on the size of the signal, and then uses the estimated channel information to generate the largest signal. Multiple transceiver in a digital multimedia broadcasting system, characterized in that for detecting the. Converting a phase reference symbol signal of a predetermined format into an inverse fast free signal; Transmitting the phase reference symbol signal and the data signal converted into the inverse fast free signal through an antenna array having a plurality of antenna stages configured of a plurality of antennas; Receiving the phase reference symbol signal and the data signal by the antenna array; Setting a window having a predetermined width to maintain orthogonality with a channel impulse response in the time axis for each antenna of the antenna array; Estimating a channel based on a phase reference symbol signal inside the set window; generating an interference cancellation signal by subtracting the regenerated signal using the estimated channel information for all j-th antennas of the j-th stage from the received signal of the i-th antenna of the j-th stage; Zeroing the addition signal calculated by adding the regenerated signal using the estimated channel information with respect to the i th antenna of the j-1 th stage by the zeroing vector of the i th antenna of the j th stage; And And detecting a data symbol for the i th antenna of the j th stage based on a predetermined decision variable generated based on the zeroed addition signal. The method of claim 5, The method of multiplex transmission and reception in a digital multimedia broadcasting system, characterized in that the phase reference symbol signal received by each antenna satisfies the following equation:

here,

Denotes a K-point circular convolution, where n _j (n) is zero with mean and variance

Additive White Gaussian Noise (AWGN), where N _t is the maximum number of transmit antennas for the channel response of the subcarrier in data modulation, and h _ij (n) is the i th transmit antenna to the j th receive antenna. X _i (n) denotes the n th subsymbol transmitted in the i th transmission antenna of the phase reference symbol signal. The method of claim 5, In the channel estimating step, multiple transmission / reception methods in a digital multimedia broadcasting system comprising estimating a channel by applying the following equation to the received phase reference symbol signal and the window:

here,

Denotes a window function corresponding to the i-th window, n _i denotes a position where an impulse is added to a phase reference symbol signal transmitted from each transmit antenna, and K denotes the number of subcarriers. The method of claim 5, In the signal detecting step, before receiving the interference cancellation signal generation process, the received signals of each antenna constituting the antenna array are arranged based on the signal size, and the largest power is obtained using the estimated channel information. Multiple transmission and reception method in a digital multimedia broadcasting system, characterized in that for detecting the signal.

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