基于正交頻分多路復用，提出了多個輸入和輸出天線頻率選擇性瑞利衰落信道中的非相干空時頻分組編碼方法。成對錯誤概率分析表明，將子載波分組與正交空時頻編碼結合，提出的碼能獲得最大空間分集和頻率分集，且只有較低的編解碼復雜性。采用提出的編碼方法，系統發射端的編碼和接收端的解碼都不需要知道信道狀態信息，減小了信道估計所帶來的系統復雜性。給出了碼的設計準則和仿真結果，驗證了頻率選擇性衰落信道中提出碼的良好性能。

Based on orthogonal frequency division multiplexing , this paper proposes non-coherent space-time-frequency grouping coding schemes in frequency-selective Multiple-Input and Multiple-Output(MIMO) antenna Rayleigh fading channels. Pair-wise error probability analysis show that combing subcarrier grouping with orthogonal space-time-frequency block coding , the proposed method can attain maximum spatial diversity and frequency diversity with low coding and decoding flexibility and neither the receiver nor the transmitter need knows the channel state information. The paper gives the code design criteria and simulation results, which confirm good performance of the proposed scheme in frequency-selective fading channels.