Study on optimal transmission and reception schemes for mobile communications

移动通信最优发射接收方案研究

基本信息

批准号：
15560318
负责人：
FUKAWA Kazuhiko
金额：
$ 2.24万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

This study aims to realize the optimum signal transmission in mobile radio OFDM systems, and focuses upon (i) minimum bit error rate (BER) precoding, (ii) the optimal receiver under co-channel interference conditions, and (iii) multiuser detection for the random access protocol. The details are described below.(1)When a receiver performs the maximum likelihood detection (MLD), a MIMO-OFDM precoder that can minimize BER of MLD is proposed. The proposed precoder controls linear processing of transmitted signals so that the upper bound of BER based on the pairwise error can be minimized. Thus it can improve BER of MLD more drastically than the conventional MMSE precoder.Furthermore, a precoder for a base station is also derived. It utilizes feedback information on a covariance matrix of interference plus noise from mobile stations, besides channel impulse responses of desired signals which are estimated by the base station. It is superior in BER performance to the conventional one that us … More es information on only the estimated channel impulse responses.(2)A receiver based on the maximum likelihood criterion is proposed to cope with co-channel interference in MIMO-OFDM systems. The proposed receiver suppresses co-channel interference by prewhitening signals received by multiple antennas, and performs signal detection by using an error between a whitening filter output and its replica. Both coefficients of the whitening filters and channel impulse responses for the replica are estimated by the eigenvalue decomposition. Computer simulations show that the proposed receiver can drastically compensate for degradation caused by the interference.(3)To improve packet throughput, a combination of the multiuser detection that can separate collided packets and the auto repeat request (ARQ) that performs metric combining is proposed. The proposed scheme identifies users whose packets collide by detecting user IDs, and then separates collided packets by nonlinear multiuser detection. When packet errors occur, it can reduce the number of retransmissions of ARQ by the metric combining. It is demonstrated that the proposed scheme can achieve about twice as much throughput as that of a conventional one. Less

这项研究旨在实现移动无线电OFDM系统中的最佳信号传输，并重点介绍（i）（i）最小位错误率（BER）预编码，（ii）在共通道干扰条件下的最佳接收器，以及（iii）随机访问协议的多源检测。详细信息如下所述。（1）当接收器执行最大似然检测（MLD）时，提出了最小化MLD的MIMO-OFDM预编码器。提出的预码器控制传输信号的线性处理，因此可以将基于成对误差的BER上限最小化。它可以比传统的MMSE预编码器更大程度地改善MLD的BER.FURTHERMORE，也得出了基站的预编码器。它利用了有关干扰矩阵的反馈信息以及移动站的噪声，除了基于基站估计的所需信号的通道脉冲脉冲响应。与传统性能相比，我们的BER性能优越……仅在估计的通道脉冲响应上提供更多信息。（2）提出了基于最大似然标准的接收器，以应对MIMO OFDM系统中的共通道干扰。提出的接收器通过多个天线收到的预晶信号抑制了二流干扰，并通过使用美白过滤器输出及其副本之间的误差来执行信号检测。美白过滤器的两个系数和复制品的通道脉冲响应均由特征值分解估算。计算机模拟表明，提议的接收器可以大大补偿由干扰引起的降解。（3）提出了可以分离碰撞数据包的多源检测的组合，并提出了执行度量组合的自动重复请求（ARQ）的组合。所提出的方案确定了通过检测用户ID碰撞数据包的用户，然后通过非线性多源检测将相撞的数据包分开。当出现数据包误差时，它可以通过公制组合减少ARQ的重传次数。已经证明，所提出的方案可以实现大约是传统方案的吞吐量的两倍。较少的