一种频选衰落信道上的STFC-OFDM技术

A Space-Time-Frequency Coded OFDM Technique Methodon Frequency-Selective Fading Channels

研究了一种适用于频率选择性瑞利衰落信道上结合空时频编码的正交频分复用(STFC-OFDM)技术.在现有的空时分组码的基础上,研究频率分集进一步发展设计了新的在空间、时间、频率域上三维编码的空时频码,并将其应用于OFDM系统中.理论分析和仿真实验表明,该技术能在译码复杂度较低的情况下,获得更大的分集增益,改善OFDM系统在频选衰落信道上的性能;与空时编码的正交频分复用(STC-OFDM)技术相比,STFC-OFDM有更好的分集增益和误码率性能.

This paper studied a new space-time-frequency coding for orthogonal frequency-division multiplexing (STFC-OFDM) transmissions over frequency-selective Rayleigh fading channels. On the basis of existing space-time block code, frequency diversity is studied and a new space-time-frequency code is further designed and applied in the OFDM system, which encodes information in spatial, temporal and frequency domain. The theoretic analysis and simulation show that it is capable of achieving larger diversity gain, improving the performance of OFDM system over frequency-selective fading channels while affording low-complexity decoding. Compared with STC-OFDM system, the STFC-OFDM shows larger diversity gain and lower BER.