网格编码8PSK-OFDM信号的多符号检测法

The Detection of Trellis-coded 8PSK-OFDM Multiple Symbol

利用π/4移位的QPSK网格编码调制(Trelliscodedmodulation,TCM)技术,通过信号集进行扩展和相位差划分,提出了π/8移位的8PSK—OFDM技术。在维特比解码代数中,对连续接收到的符号(从第1个到L个相位差)可以使用新的分支度量值来解码。这样的滑动多符号检测(SlidingMultipleSymbolDetection,SMSD)方法使误码率(BitErrorRate,BER)性能得到了改进,在不损失带宽和功率的前提下可以适用于各种不同的通信信道,特别适合于功率和带宽受限系统。

In this paper, we propose trellis-coded e/8 shift 8PSK OFDM tech niques by applying e/4 shift QPSK to Trellis-coded modulation (TCM), and perfo rming signal set expansion and set partition correspondingly based on phase diff erence. In Viterbi decoding algorithm, phase differences (from 1to L) successive ly received symbols are employed in the new branch metrics. Such sliding multipl e symbol detection (SMSD) method provides improved bit-error-rate (BER) perfor mance and is achieved for different communication channels without sacrificing b andwidth and power efficiency, especially for power and band-limited systems.