本文選題：變換域通信系統(tǒng) + 自適應(yīng)門限�。� 參考：《軍械工程學(xué)院學(xué)報(bào)》2015年01期

【摘要】：為了提高變換域通信系統(tǒng)(transform domain communication system,TDCS)在復(fù)雜多變電磁環(huán)境下的抗干擾性能,提出了一種新的TDCS自適應(yīng)門限設(shè)置方法,通過設(shè)置權(quán)重因子考慮系統(tǒng)的檢測(cè)概率和虛警概率,建立門限優(yōu)化函數(shù)并求得最優(yōu)門限值表達(dá)式.該門限值由干擾信號(hào)功率、噪聲功率以及權(quán)重因子共同決定,能夠隨著環(huán)境干噪比的變化進(jìn)行自適應(yīng)調(diào)整.理論分析和仿真實(shí)驗(yàn)證明,在多音干擾和窄帶干擾共存的信道環(huán)境下,該方法能夠準(zhǔn)確定位干擾并將其剔除,進(jìn)而生成近乎純凈無干擾的基函數(shù)幅度譜,降低了TDCS系統(tǒng)的誤碼率,提高了系統(tǒng)的抗干擾性能.
[Abstract]:In order to improve the anti-jamming performance of transform domain communication system in complex multi-variable electromagnetic environment, a new adaptive threshold setting method for TDCS is proposed. The detection probability and false alarm probability of the system are considered by setting the weight factor. The threshold optimization function is established and the expression of the optimal threshold value is obtained. The threshold is determined by the interference signal power, noise power and weight factor, and can be adjusted adaptively with the change of the ambient dry noise ratio. Theoretical analysis and simulation results show that the proposed method can accurately locate the interference and eliminate it under the coexistence of multi-tone interference and narrowband interference, and then generate the base function amplitude spectrum which is almost pure without interference. The bit error rate of TDCS system is reduced, and the anti-interference performance of the system is improved.
【作者單位】： 軍械工程學(xué)院無人機(jī)工程系;
【分類號(hào)】：TN973
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本文編號(hào)：1916446