In digital signal technique , a signal that uses a positive ( or negative ) excursion and ground as the two binary signal states 在數(shù)字信號(hào)技術(shù)中,用正(或負(fù))向電壓與地兩個(gè)電平來表示二進(jìn)制“ 1 ”和“ 0 ”的一種信號(hào)
For example , one baud equals one bit per second in a train of binary signals and one3 - bit value per second in a train of signals each of which can assume one of eight different states 例如, 1波特在二進(jìn)制信號(hào)序列中等于每秒1比特;在八種不同狀態(tài)中任選一種狀態(tài)的信號(hào)序列中等于每秒1個(gè)3位值。
The mcml circuits output low swing signal , while it is necessary to amplify it so as to interfacing the binary signal . an low - swing - signal - amplifying circuit is proposed in this dissertation to realize the interface 由于mcml電路輸出的是小擺幅信號(hào),論文提出了一個(gè)三值放大電路,將三值mcml電路的輸出進(jìn)行放大,以便進(jìn)一步轉(zhuǎn)換,實(shí)現(xiàn)和二值信號(hào)的接口。
The method and performance according to the requirements are resolved mostly . main contents as follows : ( 1 ) according to the demodulation guideline , a differential detection system is applied to the dpsk signal demodulator , which is based on the analysis and comparison using the principle of optimal binary signal detection 著重解決在皮衛(wèi)星體積結(jié)構(gòu),重量和功耗限制條件下的方案選擇和性能問題,具體內(nèi)容包括: ( 1 )對(duì)一般二進(jìn)制信號(hào)的最佳檢測(cè)原理進(jìn)行分析比較,針對(duì)本系統(tǒng)要求選擇了dpsk信號(hào)差分檢測(cè)系統(tǒng)的方案。
Due to the multi - carrier transmission technology used in mc - cdma systems , almost all the previous synchronization algorithms in mc - cdma systems are derives from that in ofdm systems . they are suitable for ofdm systems , but they are not optimal for mc - cdma systems . the data symbols transmitted in mc - cdma systems have form of cdma signal , which is greatly different from normal binary signal 傳統(tǒng)的各種mc - cdma同步算法主要還是借鑒了ofdm的同步算法,本文提出采用用戶擴(kuò)頻碼作idft后在fft之前作同步,充分利用了ofdm信號(hào)中所包含的mc - cdma信號(hào)形式,它與純粹的ofdm傳輸?shù)亩M(jìn)制數(shù)據(jù)不同,它與pn序列具有更好的相關(guān)性。
The communication system ' s performance is briefly analyzed by channel capacity , which is a function of bit error rate ( ber ) . the decision rule is based on the most likelihood method . for reproducing the original binary signals more correctly , time scale transformation method and the approach of ensemble average probability of error bits are introduced 通過理論分析和仿真實(shí)驗(yàn),本文研究了這個(gè)非線性數(shù)字通信系統(tǒng)性能,給出了誤碼率和信道容量公式,提出了系統(tǒng)參數(shù)調(diào)節(jié)方法,采用最大似然法設(shè)計(jì)了適合這個(gè)系統(tǒng)輸出的判決規(guī)則。