Information transmission method for lowering peak to average power ratio of OFDM system signal

Abstract

The invention discloses an information transmission method for lowering peak to average power ratio of an OFDM system signal. In the method of the invention, after being coded, weaved, modulated and performed with serial / parallel conversion, the input bit stream is adjacently cut into a plurality of mutually disjoint frequency domain subsequences; each subsequence is inserted with pilot frequencyas required; parts of transmission sequences are used for lowering the peak to average power ratio without transmitting a phase rotation factor to a receiving end. At the receiving end, the received signal is performed with serial / parallel conversion, DFT and parallel / serial conversion and is cut into a frequency domain signal subsequence according to the same mode with a receiver end; pilot frequency contained in the subsequence is utilized for the channel estimation of the subsequence; the multiplied phase rotation factor serves as one part of channel frequency response so as to restore frequency domain data in the subsequence; the frequency domain ratio data are combined into one sequence; and an output bit stream is obtained after demodulating, deinterlearing and decoding. The invention eliminates the influence of sideband information on the frequency spectrum utilization ratio and signal transmission rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication using an Orthogonal Frequency Division Multiplexing (OFDM) system, and in particular relates to an information transmission method that combines segmental channel estimation and partial transmission sequences to reduce the peak-to-average power ratio of OFDM signals without sending sideband information . Background technique [0002] In the mobile wireless channel, the signal arrives at the receiving antenna through a time-varying multipath channel from the transmitting antenna, which will produce time-selective fading and frequency-selective fading. Orthogonal frequency division multiplexing (OFDM) technology divides the frequency domain into multiple sub-channels, and the orthogonal overlap between adjacent sub-channels improves the efficiency of spectrum utilization. It can be seen that on the one hand, this technology can overcome frequency selective fading. On the other hand, ...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that although the partial transmission sequence method can effectively reduce the peak-to-average power ratio, it needs to send the phase rotation factor as sideband information, which makes: on the one hand, the transmission of sideband information occupies the precious spectrum resources of the system, The transmission rate of information is reduced; on the other hand, if the receiving end receives an error in the sideband information, this will lead to a substantial increase in the system bit error rate, so more bits may be needed to protect the sideband information, Further occupying more spectrum resources

Images