【摘要】：FQPSK-JR和SOQPSK-TG是IRIG-106遙測(cè)標(biāo)準(zhǔn)中可以互換的兩種信號(hào)體制,兩種信號(hào)有著近乎相同的功率效率和帶寬效率。盡管兩種信號(hào)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(hào)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(cè)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(duì)應(yīng)的最優(yōu)接收機(jī)都能提高功率效率,但信號(hào)產(chǎn)生體制的不同導(dǎo)致了其對(duì)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(hào)用CPM調(diào)制來(lái)近似表示,將SOQPSK-TG信號(hào)的頻率成型脈沖進(jìn)行了截短近似,設(shè)計(jì)了基于CPM的通用準(zhǔn)最優(yōu)解調(diào)器�；贑PM近似設(shè)計(jì)出的解調(diào)器與OQPSK解調(diào)器一樣無(wú)須對(duì)兩種信號(hào)進(jìn)行識(shí)別,仿真表明基于CPM設(shè)計(jì)的通用解調(diào)器對(duì)兩種信號(hào)進(jìn)行解調(diào)的漸進(jìn)損失都很小,對(duì)復(fù)雜度也進(jìn)行了分析對(duì)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(guó)防科技大學(xué)電子科學(xué)與工程學(xué)院;中國(guó)工程物理研究院電子工程研究所;
【基金】：國(guó)家自然科學(xué)青年基金項(xiàng)目(61201166) 國(guó)家自然科學(xué)基金項(xiàng)目(61101097)
【分類(lèi)號(hào)】：TN911.3
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本文編號(hào)：2348652