Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Modulation theory

Research into Demodulation of Continuous Phase Modulation Signal

Author LiuHaiWei
Tutor PengHua
School PLA Information Engineering University
Course Electronics and Communication Engineering
Keywords CPM Viterbi decoder Matched filter Laurent decomposition Coherent detection
CLC TN911.3
Type Master's thesis
Year 2009
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The continuous phase modulation (CPM) is a class of memory nonlinear modulation , spectrum utilization and power utilization , and has a good prospect in the radio communication environment . This efficient modulation technique having such excellent characteristics , but , since the CPM itself is a memory of the non - linear modulation scheme , the large-scale application of the CPM in the various types of wireless communication system is still subject to the complexity of the demodulator and synchronization constraints . Typically, the the CPM signal demodulation in AWGN channel with high complexity Maximum Likelihood Sequence Detection (MLSD ) . Therefore , the study of a low- complexity demodulation algorithm is of great significance for the wide application of the CPM signal . This paper first introduces the general expression of the CPM signal , the phase characteristics and power spectral density function , based on a computer simulation of its power spectral density , analyzed the characteristics of the the CPM signal modulation parameter values ??of its power spectrum impact; then depth study of the CPM signal maximum likelihood coherent demodulator and the Viterbi algorithm , using the Laurent decomposition CPM signal optimal coherent demodulator and sub-optimal coherent demodulator , and the different methods of demodulating simulation performance , through comparative analysis based on Laurent algorithm optimal coherent demodulator and sub-optimal coherent demodulator greatly reduces the complexity of the receiver in the case of loss or little loss in BER performance is almost no .

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