Information transmission method for reducing peak to average power ratio of orthogonal frequency division multiplexing signal

Abstract

The invention discloses an information transmission method for reducing the peak to average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. In the method, after being coded and interleaved, data stream is modulated by a new distorted constellation diagram so as to acquire a frequency domain signal; for the frequency domain signal, a phase rotation sequence is selected to reduce the PAPR of a time domain signal which is subjected to inverse fast Fourier transform (IFFT); at a receiver end, the received signal is subjected to fast Fourier transform (FFT) and channel estimation so as to acquire the frequency domain signal; for the frequency domain signal, recovering is performed by different phase rotation sequences so as to acquire candidate signals; amongthe candidate signals, only the signal which is recovered by the right phase rotation sequence has a minimal mean square error when the signals are subjected to hard decision together with the constellation diagram; and the candidate signal which has the minimal mean square error is selected as the original signal, and the corresponding phase rotation sequence is the recovered side band information. The method can effectively reduce the peak to average power ratio of the OFDM signal, does not need to send the side band information simultaneously, improves the frequency band utilization ratio of systems, and can be applied to various communication systems using OFDM technology.

Description

technical field [0001] The invention belongs to the technical field of wireless and wired communication using Orthogonal Frequency Division Multiplexing (OFDM), and specifically relates to an information transmission method that uses twisted constellation diagrams to reduce the peak-to-average power ratio of OFDM signals and does not send sidebands. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology, as a very effective transmission method against time-varying multipath channels, has been widely used in wireless communication systems, such as WLAN, WiMAX and DVB systems. Although OFDM technology has unique advantages in wireless communication systems, there are still some important problems in OFDM technology that have not been well resolved. One of the main disadvantages is the high peak-to-average power ratio (PAPR). The peak-to-average power ratio of an OFDM signal is defined as the ratio of peak power to average power. If the pea...

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Problems solved by technology

[0011] It can be seen that while the above two methods effectively reduce the PAPR of the OFDM signal, additional sideband information must be sent so that the receiver can obtain the correct phase rotation sequence to restore the original data, which makes the frequency band utilization of the system have a certain reduction of

In the actual communication process, additional coding and other measures are taken to ensure the correct transmission of sideband information, which further reduces the frequency band utilization of the system.

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