分集接收技術(shù)主要用于解決無(wú)線傳輸過(guò)程中的信號(hào)衰落,無(wú)線接收時(shí)的鄰頻干擾、同頻干擾等問(wèn)題,能夠有效改善接收信號(hào)的質(zhì)量。針對(duì)分布式平臺(tái)上多通道接收信號(hào)同步與分集合并算法進(jìn)行研究,提出一種適用于不同調(diào)制類(lèi)型的多通道信號(hào)合并前同頻同相調(diào)整方法,并對(duì)合并前各通道信號(hào)進(jìn)行信噪比估計(jì),以確定最大比合并時(shí)的權(quán)重。經(jīng)理論分析可知,N通道信號(hào)最多可獲得10lgNdB的合并增益。仿真驗(yàn)證結(jié)果與理論分析一致,證明了算法的有效性和可行性。 

【文章來(lái)源】：太赫茲科學(xué)與電子信息學(xué)報(bào). 2020,18(01)北大核心

【文章頁(yè)數(shù)】：7 頁(yè)

【部分圖文】：

BPSK擴(kuò)頻信號(hào)同頻同相調(diào)整仿真圖(2通道)

嗥綻掌燈?約捌?偏導(dǎo)致的碼偏。圖6為含有初始頻差和相差的2通道BPSK擴(kuò)頻信號(hào)經(jīng)一定時(shí)間的環(huán)路調(diào)整后的同相支路輸出，可見(jiàn)經(jīng)環(huán)路調(diào)整后2路信號(hào)已完全同頻同相。反映在鑒相誤差上則是誤差信號(hào)逐漸變?yōu)橼吔?，如圖7所示。繼續(xù)驗(yàn)證4通道信號(hào)的情況。接收信號(hào)為4路存在頻差相差的BPSK擴(kuò)頻信號(hào)，中心頻率為150MHz，選取通道2信號(hào)作為參考信號(hào)，通道1、通道3、通道4信號(hào)分別與信號(hào)2進(jìn)行互相關(guān)鑒相處理。4個(gè)本地NCO的初始頻率均為150MHz。Fig.2SimulationgraphofsamefrequencyandphaseadjustmentofLFMsignal(twochannels)圖2LFM信號(hào)同頻同相調(diào)整仿真圖(2通道)Fig.3Phasedetectingerrorofdifferential-modelloopofLFMsignal(twochannels)圖3LFM信號(hào)差模環(huán)鑒相誤差(2通道)Fig.4SimulationgraphofsamefrequencyandphaseadjustmentofLFMsignal(fourchannels)圖4LFM信號(hào)同頻同相調(diào)整仿真圖(4通道)Fig.5Phasedetectingerrorofdifferential-modelloopofLFMsignal(fourchannels)圖5LFM信號(hào)差模環(huán)鑒相誤差(4通道)Fig.6SimulationgraphofsamefrequencyandphaseadjustmentofBPSKspreadspectrumsignal(twochannels)圖6BPSK擴(kuò)頻信號(hào)同頻同相調(diào)整仿真圖(2通道)Fig.7Phasedetectingerrorofdifferential-modelloopofBPSKspreadspectrumsignal(twochannels)圖7BPSK擴(kuò)頻信號(hào)差模環(huán)鑒相誤差(2通道)

可見(jiàn)經(jīng)環(huán)路調(diào)整后2路信號(hào)已完全同頻同相。反映在鑒相誤差上則是誤差信號(hào)逐漸變?yōu)橼吔?，如圖7所示。繼續(xù)驗(yàn)證4通道信號(hào)的情況。接收信號(hào)為4路存在頻差相差的BPSK擴(kuò)頻信號(hào)，中心頻率為150MHz，選取通道2信號(hào)作為參考信號(hào)，通道1、通道3、通道4信號(hào)分別與信號(hào)2進(jìn)行互相關(guān)鑒相處理。4個(gè)本地NCO的初始頻率均為150MHz。Fig.2SimulationgraphofsamefrequencyandphaseadjustmentofLFMsignal(twochannels)圖2LFM信號(hào)同頻同相調(diào)整仿真圖(2通道)Fig.3Phasedetectingerrorofdifferential-modelloopofLFMsignal(twochannels)圖3LFM信號(hào)差模環(huán)鑒相誤差(2通道)Fig.4SimulationgraphofsamefrequencyandphaseadjustmentofLFMsignal(fourchannels)圖4LFM信號(hào)同頻同相調(diào)整仿真圖(4通道)Fig.5Phasedetectingerrorofdifferential-modelloopofLFMsignal(fourchannels)圖5LFM信號(hào)差模環(huán)鑒相誤差(4通道)Fig.6SimulationgraphofsamefrequencyandphaseadjustmentofBPSKspreadspectrumsignal(twochannels)圖6BPSK擴(kuò)頻信號(hào)同頻同相調(diào)整仿真圖(2通道)Fig.7Phasedetectingerrorofdifferential-modelloopofBPSKspreadspectrumsignal(twochannels)圖7BPSK擴(kuò)頻信號(hào)差模環(huán)鑒相誤差(2通道)


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