In digital signal technique , a signal that uses a positive ( or negative ) excursion and ground as the two binary signal states
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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
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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
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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
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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
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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
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