多调制指数CPM信号的新分解方式及其准相干解调

doi:10.3969/j.issn.1001-506X.2020.11.25

Abstract

Abstract:

Considering resource-limited wireless communications such as satellite communications, the relevant problems of modulation and demodulation of multi-h continuous phase modulation (multi-h CPM) signals are studied. A new way of decomposition is first designed to simplify the modulation process of the multi-h CPM signals, followed by a periodic state trellis. Then, a pilot-aided quasi-coherent demodulation algorithm is proposed to detect the multi-h CPM signals according to the designed decomposition. Moreover, the multi-h CPM signals and the single-h CPM signals are evaluated and compared from the two aspects of power spectrum and bit error performance. Simulation results show that, no matter what frequency pulse is used, the multi-h CPM signals have smoother power spectrum curves than the single-h CPM signals; only with the assistance of two pilot symbols, the performance gain of the uncoded multi-h CPM system is nearly 2 dB compared with that of the uncoded single-h CPM system, and the coded multi-h CPM system can achieve performance gain of 0.1 dB to 0.25 dB more than the coded single-h CPM system at low signal-to-noise ratios (SNRs).

Key words: Single-h continuous phase modulation (CPM), Multi-h continuous phase modulation (CPM), pilot-aided, satellite communication

CLC Number:

TN911.23

Mengmeng LIU, Xiaoying WANG, Zhongyang YU, Xingwen DING, Hongyu CHANG, Baoming BAI. Decomposition and quasi-coherent demodulation of Multi-h CPM signal[J]. Systems Engineering and Electronics, 2020, 42(11): 2614-2619.

Figures/Tables 7

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References 26

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CPM方案	频率脉冲函数
GMSK	${g(t) = \frac{1}{{2T}}\left\{ {Q\left[ {\frac{{t - T/2}}{{\sigma T}}} \right] - Q\left[ {\frac{{t + T/2}}{{\sigma T}}} \right]} \right\}}$
LREC	${g(t) = \left\{ {\begin{array}{*{20}{l}}{\frac{1}{{2LT}}, 0 \le t \le LT}\\{0, {\rm{其他}}}\end{array}} \right.}$
LRC	$g(t) = \left\{ {\begin{array}{*{20}{l}}{\frac{1}{{2LT}}\left( {1 - \cos \left( {\frac{{(2{\rm{ \mathsf{ π} }}t)}}{{LT}}} \right)} \right)}\\{0, {\rm{其他}}}\end{array}} \right., 0 \le t \le LT$

CPM方案	记忆长度L	符号集大小M	调制指数h	归一化3 dB带宽BT
GMSK	3	2	1/2	0.3
GMSK	3	2	[3/10, 7/10]	0.3
1REC	1	4	7/16	-
1REC	1	4	[2/8, 5/8]	-
3RC	3	4	5/16	-
3RC	3	4	[3/16, 7/16]	-

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Decomposition and quasi-coherent demodulation of Multi-h CPM signal

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