一种适用于频率选择性衰落信道的Turbo-BLAST系统

Turbo-BLAST over Frequency Selective Fading Channels

该文提出了一种适用于频率选择性无线衰落信道的Turbo-BLAST方案。在发送端联合采用了随机分层空时编码和分组线性星座预编码OFDM以充分利用多径和空间分集;在接收端比较了两种类型的Turbo接收机,一种是基于最小均方误差准则的软输入软输出的检测模块,它有较低的计算复杂度;另一种采用了类似球形解码的检测模块,它有很好的性能但需要较高的计算复杂度。仿真结果表明该文提出的方案能在保持BLAST高数据速率的同时充分利用信道环境提供的多径和空间分集。

A novel Turbo-BLAST scheme over frequency selective fading environment is presented in this paper. At the transmitter grouped linear constellation precoded OFDM transmission is employed following the Random Layered Space Time （RLST） coding to exploit the available both multipath and spatial diversity. At the receiver the Turbo receivers with MMSE detector and Sphere Decoding （SD） based detector are compared to explore the tradeoff between performance and complexity. Simulation results demonstrate that the available transmit diversity offered by MIMO environment can be efficiently utilized in the new scheme, while the high data rate from BLAST is retained.