A Timing Metric Estimation Method of OFDM Based on FIR Filter

Abstract

The present invention provides an FIR filter-based OFDM timing measurement estimation method. The method comprises the following steps of first, performing conjugate multiplication on a received signal and a delay signal of the received signal, so as to obtain M<0> received differential sequences; performing FIR filtering on the M<0> received differential sequences, so as to obtain M<0> filter outputs p (m, d); averaging the M<0> filter outputs p(m, d), so as to obtain an average value P (d), normalizing the average value P (d) by using OFDM received signal energy R (d), so as to obtain normalization timing measure M (d) of a symbol timing synchronization method based on an FIR structure; and finally, resolving d corresponding to a maximum of the normalization timing measure M (d), so as to obtain an OFDM symbol timing estimator shown in the description. The method is based on the FIR filter, the timing measurement can be calculated through modular processing of FIR filters of different coefficients in realization of a project, so that the received signal streams in an OFDM demodulator are processed at a high speed in real time, the realization complexity is lowered effectively, the hardware resources are reduced, and the costs are saved.

Description

technical field [0001] The invention belongs to the technical field of digital wireless communication transmission, and relates to a symbol timing metric estimation structure of an OFDM demodulator based on an FIR filter in a measurement and control communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) can provide large-capacity information transmission, and solve the problem of wireless channel performance degradation when measurement and control terminals transmit high-speed data. It has high spectrum utilization and anti-frequency selective fading, etc. Advantages, has been listed by the International Telemetry Association as one of the technical solutions for the next-generation integrated telemetry network plan. Under the complex multipath channel of measurement and control communication, OFDM can provide a high-speed, efficient and secure data transmission scheme, effectively alleviate the increasingly tense spectrum reso...

AI Technical Summary

Problems solved by technology

[0005] The technical solution problem of the present invention is: overcome the deficiency of prior art, propose a kind of OFDM symbol timing measurement estimation method based on FIR filter, solve the timing detection performance of traditional timing synchronization algorithm poor, realize the complex structure, hardware resource occupancy rate advanced questions

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