西安电子科技大学学报（自然科学版）
西安電子科技大學學報（自然科學版）
서안전자과기대학학보（자연과학판）
JOURNAL OF XIDIAN UNIVERSITY(NATURAL SCIENCE)
2014年
5期
1-6,12
,共7页
成形偏移正交相移键控%非递归%判决反馈%简化复杂度
成形偏移正交相移鍵控%非遞歸%判決反饋%簡化複雜度
성형편이정교상이건공%비체귀%판결반궤%간화복잡도
shaped offset quadrature phase-shift keying%non-recursive%decision feedback%complexity reduction
针对部分响应成形偏移正交相移键控(SOQPSK-TG)信号的解调器复杂度较高的问题，在研究递归SOQPSK-TG信号的判决反馈简化解调器的基础上，对于非递归 SOQPSK-TG 信号提出了一种利用幸存路径的简化两状态解调器.该解调器在非递归 SOQPSK-TG信号四状态网格的基础上，通过合理的状态合并，得到简化两状态网格；在接收机中采用该两状态网格作为状态转移网格对接收信号进行解调，在解调过程中由幸存路径法得到各支路的标准信号.仿真结果表明，在低信噪比区域，非递归 SOQPSK-TG信号比递归SOQPSK-TG信号具有更优越的性能；与四状态解调算法相比，非递归SOQPSK-TG信号的简化两状态解调器有0.5~1.0 d B的信噪比损失，但接收机具有较小的运算复杂度，有利于工程应用.
針對部分響應成形偏移正交相移鍵控(SOQPSK-TG)信號的解調器複雜度較高的問題，在研究遞歸SOQPSK-TG信號的判決反饋簡化解調器的基礎上，對于非遞歸 SOQPSK-TG 信號提齣瞭一種利用倖存路徑的簡化兩狀態解調器.該解調器在非遞歸 SOQPSK-TG信號四狀態網格的基礎上，通過閤理的狀態閤併，得到簡化兩狀態網格；在接收機中採用該兩狀態網格作為狀態轉移網格對接收信號進行解調，在解調過程中由倖存路徑法得到各支路的標準信號.倣真結果錶明，在低信譟比區域，非遞歸 SOQPSK-TG信號比遞歸SOQPSK-TG信號具有更優越的性能；與四狀態解調算法相比，非遞歸SOQPSK-TG信號的簡化兩狀態解調器有0.5~1.0 d B的信譟比損失，但接收機具有較小的運算複雜度，有利于工程應用.
침대부분향응성형편이정교상이건공(SOQPSK-TG)신호적해조기복잡도교고적문제，재연구체귀SOQPSK-TG신호적판결반궤간화해조기적기출상，대우비체귀 SOQPSK-TG 신호제출료일충이용행존로경적간화량상태해조기.해해조기재비체귀 SOQPSK-TG신호사상태망격적기출상，통과합리적상태합병，득도간화량상태망격；재접수궤중채용해량상태망격작위상태전이망격대접수신호진행해조，재해조과정중유행존로경법득도각지로적표준신호.방진결과표명，재저신조비구역，비체귀 SOQPSK-TG신호비체귀SOQPSK-TG신호구유경우월적성능；여사상태해조산법상비，비체귀SOQPSK-TG신호적간화량상태해조기유0.5~1.0 d B적신조비손실，단접수궤구유교소적운산복잡도，유리우공정응용.
To solve the problem of high complexity in the demodulator for a partial-response version of shaped-offset quadrature phase-shift keying(SOQPSK-TG),a simplified two-state demodulator for non-recursive SOQPSK-TG using the survivor path is proposed based on the decision feedback simplified demodulator of recursive SOQPSK-TG.First,a two-state trellis is deduced by proper state merging based on the four-state trellis of non-recursive SOQPSK-TG.Then,the simplified two-state trellis is used as the state transition trellis in the receiver to demodulate the received signal,and during the demodulation the hypothesized signal of each branch is obtained via the survivor path.Simulation results show that non-recursive SOQPSK-TG has a better performance than recursive SOQPSK-TG in the low SNR region,and the simplified two-state demodulator of non-recursive SOQPSK-TG has 0.5~ 1.0 dB SNR degradation compared with the four-state demodulation algorithm;however the low computation complexity is beneficial to engineering application.
