FQPSK和SOQPSK信号的通用准最优解调设计
发布时间：2018-11-22 08:13
【摘要】：FQPSK-JR和SOQPSK-TG是IRIG-106遥测标准中可以互换的两种信号体制,两种信号有着近乎相同的功率效率和带宽效率。尽管两种信号都可以采用常规的OQPSK接收机进行解调,但是基于OQPSK结构的接收机忽略了两种信号固有的记忆特性,其解调性能损失相比最优解调达2dB之多。在遥测链路中,受设备体积及电源限制,2dB的功率损失是至关重要的。虽然基于其调制体制相对应的最优接收机都能提高功率效率,但信号产生体制的不同导致了其对应的最优接收机结构不同。将IRIG-106标准中的FQPSK-JR信号用CPM调制来近似表示,将SOQPSK-TG信号的频率成型脉冲进行了截短近似,设计了基于CPM的通用准最优解调器。基于CPM近似设计出的解调器与OQPSK解调器一样无须对两种信号进行识别,仿真表明基于CPM设计的通用解调器对两种信号进行解调的渐进损失都很小,对复杂度也进行了分析对比。
[Abstract]:FQPSK-JR and SOQPSK-TG are two interchangeable signal systems in the IRIG-106 telemetry standard. The two signals have almost the same power efficiency and bandwidth efficiency. Although both kinds of signals can be demodulated by conventional OQPSK receiver, the receiver based on OQPSK structure ignores the inherent memory characteristics of the two signals, and its demodulation performance loss is as much as 2dB. In telemetry links, the power loss of 2dB is very important due to the limitation of equipment volume and power supply. Although the optimal receiver based on its modulation system can improve the power efficiency, the different signal generation systems lead to the difference of the corresponding optimal receiver structure. The FQPSK-JR signal in IRIG-106 standard is approximately represented by CPM modulation, and the frequency shaping pulse of SOQPSK-TG signal is truncated. A universal quasi-optimal demodulator based on CPM is designed. The demodulator based on CPM approximation does not need to recognize the two signals just like the OQPSK demodulator. The simulation results show that the progressive loss of demodulator based on CPM is very small, and the complexity is also analyzed and compared.
【作者单位】： 国防科技大学电子科学与工程学院;中国工程物理研究院电子工程研究所;
【基金】：国家自然科学青年基金项目(61201166) 国家自然科学基金项目(61101097)
【分类号】：TN911.3
，
本文编号：2348652
[Abstract]:FQPSK-JR and SOQPSK-TG are two interchangeable signal systems in the IRIG-106 telemetry standard. The two signals have almost the same power efficiency and bandwidth efficiency. Although both kinds of signals can be demodulated by conventional OQPSK receiver, the receiver based on OQPSK structure ignores the inherent memory characteristics of the two signals, and its demodulation performance loss is as much as 2dB. In telemetry links, the power loss of 2dB is very important due to the limitation of equipment volume and power supply. Although the optimal receiver based on its modulation system can improve the power efficiency, the different signal generation systems lead to the difference of the corresponding optimal receiver structure. The FQPSK-JR signal in IRIG-106 standard is approximately represented by CPM modulation, and the frequency shaping pulse of SOQPSK-TG signal is truncated. A universal quasi-optimal demodulator based on CPM is designed. The demodulator based on CPM approximation does not need to recognize the two signals just like the OQPSK demodulator. The simulation results show that the progressive loss of demodulator based on CPM is very small, and the complexity is also analyzed and compared.
【作者单位】： 国防科技大学电子科学与工程学院;中国工程物理研究院电子工程研究所;
【基金】：国家自然科学青年基金项目(61201166) 国家自然科学基金项目(61101097)
【分类号】：TN911.3
，
本文编号：2348652
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