發(fā)布時間：2018-11-22 08:13

【摘要】：FQPSK-JR和SOQPSK-TG是IRIG-106遙測標(biāo)準(zhǔn)中可以互換的兩種信號體制,兩種信號有著近乎相同的功率效率和帶寬效率。盡管兩種信號都可以采用常規(guī)的OQPSK接收機(jī)進(jìn)行解調(diào),但是基于OQPSK結(jié)構(gòu)的接收機(jī)忽略了兩種信號固有的記憶特性,其解調(diào)性能損失相比最優(yōu)解調(diào)達(dá)2dB之多。在遙測鏈路中,受設(shè)備體積及電源限制,2dB的功率損失是至關(guān)重要的。雖然基于其調(diào)制體制相對應(yīng)的最優(yōu)接收機(jī)都能提高功率效率,但信號產(chǎn)生體制的不同導(dǎo)致了其對應(yīng)的最優(yōu)接收機(jī)結(jié)構(gòu)不同。將IRIG-106標(biāo)準(zhǔn)中的FQPSK-JR信號用CPM調(diào)制來近似表示,將SOQPSK-TG信號的頻率成型脈沖進(jìn)行了截短近似,設(shè)計了基于CPM的通用準(zhǔn)最優(yōu)解調(diào)器�；贑PM近似設(shè)計出的解調(diào)器與OQPSK解調(diào)器一樣無須對兩種信號進(jìn)行識別,仿真表明基于CPM設(shè)計的通用解調(diào)器對兩種信號進(jìn)行解調(diào)的漸進(jìn)損失都很小,對復(fù)雜度也進(jìn)行了分析對比。
[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.
【作者單位】： 國防科技大學(xué)電子科學(xué)與工程學(xué)院;中國工程物理研究院電子工程研究所;
【基金】：國家自然科學(xué)青年基金項目(61201166) 國家自然科學(xué)基金項目(61101097)
【分類號】：TN911.3
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本文編號：2348652