Signal transmission method, system and device of frequency modulation constant envelope OFDM communication system

Abstract

The invention relates to a signal transmission method, system and device of a frequency modulation constant envelope OFDM communication system. The method comprises the following steps: receiving an initial data signal of a wireless channel; performing synchronization processing on the initial data signal to obtain a synchronous data signal; performing QPSK frequency modulation and demodulation processing on the synchronous data signal to obtain a preliminary information bit, and performing error adjustment on the preliminary information bit to obtain an original information bit; performing QPSK frequency modulation on the original information bits to obtain a data sequence, and solving a conjugate symmetric sequence of the data sequence; performing sorting zero insertion processing on thedata sequence and the conjugate symmetric sequence to obtain an all-zero sequence; and performing IFFT transformation on the all-zero sequence to obtain an OFDM signal. By means of the mode that theOFDM signals are subjected to frequency modulation processing to obtain the frequency modulation signals, framing operation is conducted on the frequency modulation signals, and the framed frequency modulation signals are sent to the wireless channel, the utilization value of traditional equipment is improved.

Description

technical field [0001] The invention belongs to the technical field of communication system signal transmission, and in particular relates to a signal transmission method, system and equipment of a frequency modulation modulation constant envelope OFDM communication system. Background technique [0002] In the field of wireless broadband communication, Orthogonal Frequency Division Multiplexing (OFDM) technology has demonstrated its great ability, it has higher spectrum utilization and good anti-interference ability, and has anti-interference ability in mobile environment. The capability of multipath interference, and flexible selection of different modulation methods according to the application scenarios, while the OFDM waveform itself provides good spectrum suppression and supports diversified fusion, making it easy to be used in combination with other access methods, Able to provide high-speed, reliable, heterogeneous, packet switching and other services. Because of thi...

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Problems solved by technology

If the PAPR value is too high, the power amplifier D / A and A / D converter need to have a large dynamic range. The nonlinearity of these components will make the OFDM system extremely sensitive to the nonlinear distortion caused by the transmitter power amplifier. If there is not enough power Compensation, the system will produce spectrum broadening, intermodulation distortion, leading to performance degradation, although these problems can be compensated by increasing the power, but the compensation measures will greatly reduce the efficiency of the power amplifier, which is a fundamental problem for mobile devices powered by batteries

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