摘要
提出了一种格形编码的正交频分复用 (TC OFDM )方案 ,研究把正交频分复用(OFDM )和格形编码 (TCM )有机地结合 ,来克服时间色散信道中的频率选择性和多径衰落。对码率 2 / 3格形编码的 8DPSK OFDM在时间色散信道中的误码率性能进行了分析和模拟 ,讨论了不同正交载波数情况下格形编码的设计。结果表明 ,在比特误码率BER为 10 - 3时采用TC OFDM方案与未编码系统相比可以提供 6dB的编码增益。
A trellis coded orthogonal frequency division multiplex (TC OFDM) system, which combines OFDM with trellis coded modulation for combating the effects of frequency selective and multipath fading of time dispersive channels is presented. The BER performance of rate 2/3 trellis coded 8DPSK OFDM over time dispersive channels is simulated. The design of trellis codes at different carriers numbers of OFDM is discussed. The results show that TC OFDM system can provide 6dB coding gain at a BER of 10 -3 compared with no coding OFDM system.
关键词
格形编码调制技术
正交频分复用
时间色散信道
fading channels
trellis-coded modulation
orthgonal frequency division multiplex
