differential demodulation

To fit the needs of burst communication systems, one-bit and two-bit differential demodulation methods are studied in the thesis and realizes GMSK modulation and demodulation process using the former. A comparison is made to see the performance differences of the two methods using MATLAB.

针对突发通信系统需要，对1bit差分解调和2bit差分解调技术进行了研究，在MATLAB中用1bit差分解调技术实现了GMSK信号的调制解调，并对两种解调的性能进行了仿真对比。

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This paper advances an implement scheme of the PAM-UWB system. The scheme adopts the synchronization algorithm which combines the TDT algorithm and slipping correlation, and the differential demodulation method for information recovery.

本文提出了一种PAM-UWB系统的实现方案，该方案采用TDT同步算法与滑动相关相结合的同步算法，在同步实现后采用差分解调实现信息恢复。

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Thirdly, for differential demodulation, two kinds of timing algorithm and improvements in application are proposed, joint synchronization algorithm and statistical algorithm.

再次，针对差分解调提出了两种定时算法，联合同步法和统计法。

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Inverted Differential Grating Demodulation System of Laser Doppler

倒置差动式激光多普勒光栅检波系统

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The simulation results show that the performance improvement of proposed algorithm is superior to conventional differential demodulation by 1.4 dB at a BER of 10-4 in AWGN channel.

仿真表明，相对于软判决译码时传统的差分解调，该算法在误比特率BER为10-4时在AWGN信道中有1.4dB的性能改善，在Rician信道中同样有显著的性能改善。

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Design of digital filter is an important part in signal processing. The band-pass, low-pass and delay filters are involved in differential demodulation.

数字滤波器的设计是信号处理中非常重要的环节，在差分解调中涉及到带通、低通和延时滤波器的设计。

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The paper proposes the application of nonredundant error correction in differential demodulation combined with soft-decision decoding.

提出了结合软判决译码的非冗余纠错（nonredundant error correction）在差分解调中的应用。

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