連續(xù)相位調(diào)制的非相干減少狀態(tài)差分序列檢測(cè)算法
Noncoherent Reduced State Differential Sequence Detection of Continuous Phase Modulation
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摘要: 該文提出了連續(xù)相位調(diào)制的一種非相干減少狀態(tài)的差分序列檢測(cè)(RSDSD)算法.該算法基于減少狀態(tài)序列檢測(cè)(RSSD)的思想,利用簡(jiǎn)化狀態(tài)格狀圖進(jìn)行一碼元差分Viterbi檢測(cè).分析了全響應(yīng)連續(xù)相位調(diào)制(CPM)信號(hào)和部分響應(yīng)CPM信號(hào)簡(jiǎn)化狀態(tài)格狀圖的最小平方歐氏距離.在AWGN信道下以八進(jìn)制h=1/8的2RC信號(hào)為例給出RSSD和RSDSD算法的性能.對(duì)不同的簡(jiǎn)化方案以及存在多普勒頻移時(shí)相干RSSD和非相干RSDSD的性能進(jìn)行了比較.仿真結(jié)果表明:所提出的算法比相干最大似然序列檢測(cè)在10-3誤比特率時(shí)信噪比損失約為2dB,但它對(duì)于載波恢復(fù)困難的情形更為合適和穩(wěn)健.
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關(guān)鍵詞:
- 連續(xù)相位調(diào)制;維特比檢測(cè);AWGN;非相干檢測(cè)
Abstract: A noncoherent Reduced State Differential Sequence Detection （RSDSD） for Continuous Phase Modulation （CPM） is proposed in this paper, The algorithm makes use of the reduced state trellis based on Reduced State Sequence Detection （RSSD） and performs one-symbol differential Viterbi detection. The minimum square Euclidean distance of the reduced state trellis is analyzed for full response CPM and partial response CPM. Performance of RSSD and RSDSD is simulated for octal 2RC signal with h=1/8 in the AWGN channel and comparisons are made between different reduction schemes and between coherent RSSD and noncoherent RSDSD with Doppler frequency shifts. Simulation results show： although the proposed algorithm is degraded by 2dB at 10-3 bit error rate compared with coherent Maximum Likelihood Sequence Detection（MLSD）, it is more appropriate and robust to the situation when the carrier recovery is difficult. -
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