Method for using system information to inhibit phase noise in orthogonal frequency division multiplexing system

Abstract

The invention relates to a method using the system information to restrain the phase noise in the orthogonal frequency division multiplexing system, belonging to the transmission of digital information technical field. The method includes carrying the symbol mapping process at the transmitting terminal after the input signals are processed with scrambling code, channel encoding to generate the data symbols; obtaining the frame head; inserting the system information sub carrier into the data symbols to obtain the frame; multiple connecting the frame head and the frame to obtain the signal frame through forming filter, digital analog conversion, radio frequency up conversion, then the signal frame is transmitted to the receiving end; receiving the signal frame at the receiving end to obtainthe system information sub carrier in the signal frame and fetch several sub carrier between the system information sub carrier for phase noise estimation, solve the LS equation to get the frequency domain estimation of the phase noise, finally carry the phase correction in the time domain to get the signal frame after being compensated. The signal frame is carried with de-mapping after being compensated, and output after coding process.

Description

technical field The invention relates to the technical field of digital information transmission, in particular to a method for suppressing phase noise by using system information in an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique The main problem in the current digital information transmission technology (such as wireless transmission system) is how to effectively suppress the influence of phase noise on the signal during the signal transmission process. Figure 1 is a system diagram of the radio frequency front end in the wireless transmission system. At the transmitting end, the digital signal passed through the baseband modulator is output to the digital-to-analog conversion (D / A), and the signal passes through the low-pass filter (LPF), up-converter, and radio frequency filter in turn, and then is transmitted through the antenna. In a wireless propagation environment, signals are affected by various interferences and noises. At the rec...

AI Technical Summary

Problems solved by technology

The ICI self-cancellation method is another non-data-assisted compensation method for phase noise without any pilot data. It does not change the symbol form, but reduces the spectrum utilization due to the introduction of a large amount of redundancy.

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