一种分布式MIMO信号的发射与检测方法

A transmission and detection technique for distributed MIMO signal

摘要:

在V-BLAST结构的分布式多输入多输出(MIMO)系统中，针对发射天线地域分布所引起的发射符号异步到达接收天线的问题，给出了一种分布式MIMO系统的信号发射与检测方法。在慢衰落信道中，该方法利用接收端反馈的信道状态信息，采用几何平均分解(GMD)构建等对角的上三角矩阵，消除子信道间增益的不平衡。在莱斯衰落信道下的计算机仿真表明，与已有QR分解的分层算法相比，该检测方法能够显著提升系统的误码性能。

Abstract:

Aiming at the problem of the asynchronous arrival at receiving antennas caused by the distributed location of transmit antennas, a transmission and detection technique is presented for distributed Multiple Input Multiple Output(MIMO) system with V-BLAST(Vertical Bell Labs Layered Space Time) architecture. In slowly fading channel, an equal diagonal upper triangular channel is constructed based on the Geometric Mean Decomposition(GMD) method by making use of the feedback channel state information to eliminate the imbalance among subchannel gains. The simulation results under Ricean fading conditions show that, compared with QR decomposition algorithm, the proposed detection technique can improve the BER performance remarkably.