Lead code pre-emphasis method of OFDM (Orthogonal Frequency Division Multiplexing) transceiver

Abstract

The invention relates to a lead code pre-emphasis system of an OFDM (Orthogonal Frequency Division Multiplexing) transceiver. The lead code pre-emphasis system comprises a physical environment testing module, an emphasis network, a kasami code generation module, a frequency domain conversion module, an emphasis processing module, a time domain conversion module, an OFDM transmitter and an OFDM receiver; the physical environment testing module is used for testing a communication channel and outputting an attenuation curve characteristic vector of the communication channel to the emphasis network; the emphasis network is used for carrying out inversion on the vector to obtain a weighted value and outputting the weighted value to the emphasis processing module; the kasami code generation module is used for generating a kasami code, switching the kasami code to the frequency domain and outputting the kasami code switched to the frequency domain to the emphasis processing module; and the emphasis processing module is used for carrying out weighting processing on the kasami code which is switched into the frequency domain according to the weighted value, switching the weighted kasami code into the time domain and outputting the kasami code switched to the time domain to the OFDM transmitter and directly outputting the standard kasami code to the OFDM receiver. The lead code pre-emphasis system disclosed by the invention has stronger practicability and capability of accurately extracting the line attenuation situation in allusion to an instruction response type serial bus physical transmission channel; Due to adoption of the OFDM receiver and the OFDM transmitter, only is an RAM (Random Access Memory) storage value of the lead code changed without extra working module.

Description

Technical field: [0001] The invention relates to the field of digital processing, in particular to a preamble pre-emphasis method for an OFDM transceiver under its physical transmission environment. Background technique: [0002] Aiming at the instruction response type serial bus transmission environment, the present invention proposes a preamble pre-emphasis technology of an OFDM transceiver to effectively resist strong frequency selective fading. In the command-response serial bus high-speed transmission system, OFDM is used to distribute high-speed data to each sub-carrier. Since the command-response serial bus channel has strong frequency selective fading, it will seriously affect the signal on the sub-carrier. Amplitude distortion reduces the signal-to-noise ratio and capture performance of the system. [0003] The traditional channel estimation and equalization technology performs signal correction after packet detection, and only corrects the valid data in the rear p...

AI Technical Summary

Problems solved by technology

[0003] The traditional channel estimation and equalization technology performs signal correction after packet detection, and only corrects the valid data in the rear part of the data frame, and does not correct the preamble in the front part of the data frame, that is to say, the preamble will produce strong amplitude distortion, which cannot be resisted Strongly frequency-selective fading channels, resulting in poor acquisition performance

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