Method for improving spectrum efficiency in full-spectrum carrier modulation system
A carrier modulation and full-spectrum technology, applied in multi-carrier systems, phase-modulated carrier systems, multi-frequency code systems, etc., can solve the problems of low spectrum utilization and communication speed, limiting application and development, etc.
Active Publication Date: 2014-07-02
XIAMEN UNIV
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However, the spectrum utilization and communication rate of this modulation system are relatively low, which limits its application and development
Later, there were literature (LeBlanc L R, Beaujean P P.Multi-frequency shift key and differential phase shift key for acoustic modem[C] / / Autonomous Underwater Vehicle Technology,1996.AUV'96.,Proceedings of the1996Symposium on.IEEE,1996 :160-166) proposed to superimpose and output the multi-channel linear frequency modulation signal frequency shift keying modulation signal, which can improve the transmission rate, but this modulation method only uses N frequency points in the spectrum
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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0031] A method for improving spectrum utilization in a full-spectrum carrier modulation system, the system block diagram is as follows figure 1 As shown, the source first generates data information, and after symbol mapping and serial-to-parallel conversion, HFM full-spectrum modulation is performed. The modulation process is as follows: figure 2 As shown, using the idea of OFDM frequency band division, the frequency band of the system is divided into N sub-bands [f 0 , f 1 ,..., f N-1 ] f i (i=0,...,N-1), the division of sub-bands has three typical situations: respectively, there is no overlap between adjacent spectrums, there is half overlap between adjacent spectrums, and there is complete overlap between adjace...
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The invention relates to a method for improving the spectrum efficiency in a full-spectrum carrier modulation system and relates to wireless communication. The method includes the step of signal processing at a transmitting end and signal processing at a receiving end. In the step of signal processing at the transmitting end, an information source generates data information, and QPSK symbol mapping is performed on the data information; mapped symbol information is modulated into the HFM waveform, and a full-spectrum modulation mode is achieved; multiple paths of modulated HFM signals are superposed through a summator and then output; the superposed modulation signals pass through a D / A converter, are subjected to signal power amplification and finally are sent into a channel. In the step of signal processing at the receiving end, received signals pass through a filtering amplifier and are subjected to A / D conversion, and then digital signals suitable for being processed are obtained; an uncorrelated demodulation method is adopted for the system, a group of local signal are generated at the receiving end to perform matched filtering on the received signals, and all paths of symbol information are separated; the separated information are subjected to symbol demapping, and bit information is output. Because the multiple paths of signals are superposed and then output, spectrum efficiency is improved.
Description
technical field [0001] The invention relates to wireless communication, in particular to a method for improving frequency spectrum utilization in a full frequency spectrum carrier modulation system. Background technique [0002] In the development of wireless communication technology, with the improvement of people's communication needs and the complexity of communication environment, high data transmission rate will cause serious multipath interference problems. Multi-carrier modulation technology is a high-speed data transmission technology. Orthogonal frequency division multiplexing technology is one of the multi-carrier modulation methods. It meets the requirements of high speed and overcoming interference at the same time, and divides the entire transmission frequency band into N The high-speed serial code with transmission is modulated onto these subcarriers in parallel. This modulation method only uses N frequency points on the spectrum to transmit information, which ...
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Login to View More IPC IPC(8): H04L27/26H04L27/20H04L27/32
Inventor 孙海信蒯小燕黄梅程恩齐洁
Owner XIAMEN UNIV