Method for modulating full frequency spectrum carrier wave

Abstract

The invention discloses a method for modulating a full frequency spectrum carrier wave, and relates to wireless communication. The method comprises sending end signal processing and receiving end signal processing. The sending end signal processing comprises the steps of generating data information by an information source, conducting QPSK symbol mapping on the data information, conducting chirp multi-carrier modulation on the information after symbol mapping, converting transmitted information into chirp signal waveforms through the modulation method, overlaying the modulated information through a summator, outputting the information, amplifying the overlaid modulation signals through a D / A converter and signal power, and finally sending the signals to a channel. The receiving end signal processing comprises the steps of enabling the received signals to pass through a filter amplifier and an A / D converter, obtaining digital signals suitable for being processed, adopting a non-coherent demodulation method by the system, generating a set of corresponding local signals at the receiving end to conduct coherent processing on the received signals, separating symbolic information of all ways, conducting symbolic demapping on the separated information, and outputting bit information. The frequency spectrum utilization rate and the reliability of the system are improved.

Description

technical field [0001] The invention relates to wireless communication, in particular to a method for modulating a full spectrum carrier. 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 Orthogonal sub-channels, and the high-speed serial codes with transmission are modulated onto these sub-carriers in parallel. This modulation method can effectively improve the transmission rate and frequency band utilization (Han Xiaoyan, research on OF...

AI Technical Summary

Problems solved by technology

Chirp signals were often used in frequency shift keying modulation technology in the early days. Using chirp signals as carrier signals to modulate the transmitted data sequence onto such carrier signals has the advantages of good reliability and anti-fluctuation characteristics. However, this modulation method Its spectrum utilization rate and communication rate are relatively low, which limits its application and development

Later, with the development of multi-carrier modulation technology, code division multiple access spread spectrum, space diversity technology, etc., the frequency shift keying modulation technology based on chirp has been further developed, the 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 the 1996 Symposium on.IEEE, 1996:160-166) proposes to use multi-channel chirp frequency The shift keying modulation signal is superimposed and output, which can save transmission time and increase the transmission rate. However, this modulation method does not make full use of the full frequency band to transmit information, but only uses some frequency points in the frequency band to transmit information, which wastes a lot. Spectrum resources

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