公开(公告)号：KR100843252B1

公开(公告)日：2008-07-03

申请号：KR1020070037629

申请日：2007-04-17

Applicant: 한국전자통신연구원

Inventor： 남준영 ,  김성락 ,  정현규

IPC: H04B1/7097

Abstract: 본 발명은 이동통신시스템에서의 반복 수신 방법 및 반복 수신기에 관한 것이다.
본 발명은 다중 셀 환경에서 반복 수신되는 수신 신호에서 셀 간 간섭을 제거하기 위하여, 자기 셀을 제외한 다른 셀의 경성 판정치를 이용한다. 또한, 채널 추정의 부정확성 등으로 인해 발생할 수 있는 자기 셀 내의 다른 사용자의 간섭을 제거하기 위하여 자기 셀 신호의 경성 판정치를 이용한다. 또한, 경성 판정치를 이용한 간섭제거를 수행하는 반복 수신기의 수신 성능을 향상시키기 위하여 반복 수신되는 신호에 대해 자기 셀 신호의 경성 판정치를 이용하여 반복적으로 채널 추정을 수행하여 채널 추정치를 갱신한다.
MC-CDMA, 다중반송파, 경성 판정, 간섭, 반복 수신

Abstract translation: 本发明涉及移动通信系统中的迭代接收方法和迭代接收机。

公开(公告)号：KR1020080052214A

公开(公告)日：2008-06-11

申请号：KR1020070052598

申请日：2007-05-30

Applicant: 한국전자통신연구원

Inventor： 김성락 ,  남준영 ,  정현규

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04L1/0048 ,  H04B7/0854 ,  H04L1/005 ,  H04L1/06

Abstract: An iterative receiver and a method for detecting transmitted signal thereof are provided to increase the receiving performance of signals transmitted from a transmitter. An iterative receiver(100) includes an antenna array(110), a signal detector(120), a decoder(130), a soft decision unit(140), a channel estimator(150), a covariance estimator(160), and a hard decision unit(170). The antenna array includes plural receiving antennas, and receives a signal from a transmitter and transmits the signal to the signal detector. The signal detector cancels an interference signal from the received signal and suppresses the residual interference signal through an MMSE(Minimum Mean Squared Error) filter to detect and output a signal corresponding to a plurality of transmitted signals. The decoder calculates an LLR(Log-Likelihood Ratio) by using the output signal of the signal detector, performs a channel decoding process by using the calculated LLR, and outputs a resultant signal. The soft decision unit performs a soft decision process on plural transmitted signals by using the channel decoded signal output by the decoder. The channel estimator estimates the channel, through which the transmitted signals have passed, by using the transmitted signals from the soft decision unit and a received signal. The covariance estimator estimates the covariance on the summed signal of interference and noise by using the transmitted signals from the soft decision unit, channel information from the channel estimator, and the received signal. The hard decision unit determines a plurality of transmitted signals by using the signal output by the decoder after the signal detector, the decoder, the soft decision unit, the channel estimator, and the covariance estimator are iterated a predetermined number of times.

Abstract translation: 提供了一种用于检测其发送信号的迭代接收机和方法，以增加从发射机发射的信号的接收性能。 迭代接收机（100）包括天线阵列（110），信号检测器（120），解码器（130），软判决单元（140），信道估计器（150），协方差估计器（160） 硬决策单元（170）。 天线阵列包括多个接收天线，并且从发射机接收信号，并将该信号发送到信号检测器。 信号检测器从接收信号中消除干扰信号，并通过MMSE（最小均方误差）滤波器抑制残留干扰信号，以检测和输出与多个发送信号相对应的信号。 解码器通过使用信号检测器的输出信号来计算LLR（对数似然比），通过使用计算的LLR执行信道解码处理，并输出结果信号。 软判决单元通过使用解码器输出的信道解码信号对多个发送信号进行软判定处理。 信道估计器通过使用来自软判决单元的发送信号和接收信号来估计传输信号已经通过的信道。 协方差估计器通过使用来自软判决单元的发送信号，来自信道估计器的信道信息和接收信号来估计干扰和噪声的求和信号的协方差。 硬判决单元在信号检测器，解码器，软判决单元，信道估计器和协方差估计器被迭代预定次数之后，通过使用由解码器输出的信号来确定多个发送信号。

公开(公告)号：KR1020080050204A

公开(公告)日：2008-06-05

申请号：KR1020070037629

申请日：2007-04-17

Applicant: 한국전자통신연구원

Inventor： 남준영 ,  김성락 ,  정현규

IPC: H04B1/7097

CPC classification number: H04B1/71075 ,  H04B1/71072 ,  H04B2201/70702

Abstract: An iterative reception method and an iterative receiver are provided to improve a reception performance by obtaining an accurate channel estimated value by iteratively updating the channel estimated value. An iterative receiver receives signals iteratively transmitted from a plurality of cells, and a channel estimator outputs a channel estimated value obtained by using pilot symbols of the reception signals(S100). If the number of iterative receptions is not a first sequence(S110), an inter-cell parallel interference canceler reduces an inter-cell interference of the reception signal by using spread value of hard decision values of the other remaining cell signals(second cell signals) than its pertinent cell signal, namely, the first cell signal, and outputs the same(S120). An equalizer performs channel equalization corresponding to each subcarrier on the inter-cell interference-reduced signal by using the channel estimated value, and the orthogonality of the corresponding signal is restored and outputted(S130). The orthogonality-restored signal is despread by a despreader and outputted(S140). The despread signal is inputted to a hard decision unit and used to calculate a hard decision value obtained by making a hard decision on a user symbol of the pertinent cell(S150). The hard decision value is re-spread by a hard decision spreader(S160).

Abstract translation: 提供迭代接收方法和迭代接收机，以通过迭代地更新信道估计值来获得准确的信道估计值来提高接收性能。 迭代接收机接收从多个小区迭代发送的信号，并且信道估计器输出通过使用接收信号的导频符号获得的信道估计值（S100）。 如果迭代接收次数不是第一序列（S110），则小区间并行干扰消除器通过使用其余剩余小区信号的硬判决值的扩展值来减少接收信号的小区间干扰（第二小区信号 ）比其相关单元信号，即第一单元信号，并输出相同的单元信号（S120）。 均衡器通过使用信道估计值来对小区间干扰减少信号上的每个子载波进行信道均衡，并恢复并输出相应信号的正交性（S130）。 正交恢复信号由解扩器解扩并输出（S140）。 解扩信号被输入到硬判决单元，用于计算通过对相关单元的用户符号进行硬判定而获得的硬判定值（S150）。 硬决策扩展器重新传播硬判决值（S160）。