OFDM synchronization method

Abstract

The invention pertaining to the field of wireless data transmission technology discloses an orthogonal frequency division multiplexing (OFDM) synchronization method. The method comprises steps of estimating data connection between a PC (personal computer) and an FPGA (field-programmable gate array), an FPGA synchronization adjusting module receiving un-synchronized baseband OFDM flow of symbols, and counting sampling points of data; the PC sending interception sampling control signals to the FPGA for controlling the FPGA to intercept sampling data within an appointed range and counting value of sampling points at the interception moment from the OFDM flow of symbols after the synchronization adjusting, and then sending back the sampling data and counting value to the PC, the PC performing synchronization detection to the data sent back according to the current synchronization state and sending a synchronization adjustment control signal to the FPGA to perform synchronization adjustment, at the same time, upgrading the synchronization state and interception range in the interception sampling control signal to complete one synchronized cycle, performing synchronized cycles continuously, and finally outputting a synchronized pilot frequency and data separated OFDM flow of symbols. By adopting the method, complex calculation part in an OFDM synchronization method is transferred from FPGA to PC, the implement of OFDM synchronization method becomes easier relatively.

Description

technical field [0001] The invention belongs to the technical field of wireless data transmission, in particular to an OFDM system synchronization method based on the combination of a general-purpose computer and a field programmable gate array, Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology is actually a kind of multi-carrier modulation, which has the characteristics of high spectrum utilization and anti-multipath interference. The main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-channel. The signal bandwidth on the sub-channel is smaller than the relevant bandwidth of the channel, so each sub-channel can be regarded as flat fading, so OFDM can effectively resist the frequency selective fading of the channel. And since the bandwidth of each sub-channel is only a small part of the origina...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the synchronization method of the receiving end encountered when adopting OFDM technology in the communication system realized by FPGA is difficult to realize in FPGA, proposes a kind of orthogonal frequency division multiplexing synchronization method, in FPGA and PC The transmission interface of data sampling and synchronous control signals is established between them, and the synchronous detection method that requires more complex calculations is transferred to the PC, making the implementation of the OFDM synchronous method relatively easy

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