Adaptive frequency offset estimation method of filtered multi-tone modulation system

Abstract

The invention provides an adaptive frequency offset estimation method of a filtered multi-tone modulation system. The method comprises the steps of: continuously and repeatedly transmitting same synchronous training symbols at a transmitting end of the filtered multi-tone modulation system, to form synchronous training sending signals sTR(n) with LTR symbol periods, wherein the length of the synchronous training sending signals is larger than time domain truncation length of a filter in the system, and transmitting the sending signals to a receiving end, so that synchronous training receiving signals rTR(n) having multiple cyclic delay redundancy property on a time domain is correspondingly received by the receiving end; and carrying out adaptive recursive selection of a proper delay interval and the related length by utilizing multiple redundancy of the synchronous training receiving signals rTR(n) on the time domain, performing frequency offset estimation by virtue of the redundancy delay correlation of the delay interval and the related length, and carrying out adaptive recursive cycle through setting recursive conditions during the process of solving frequency offset estimated values, so as to realize optimization of frequency offset estimation range and estimation precision specific to different frequency offset conditions.

Description

technical field [0001] The invention relates to the fields of communication technology and information processing technology, in particular to an adaptive recursive frequency offset estimation method of a filter multi-tone modulation system. Background technique [0002] Multi-carrier technology, in essence, converts one broadband high-speed data stream into parallel multiple relatively low-speed data streams through serial-to-parallel conversion, and then modulates them onto multiple subcarriers that are orthogonal to each other, thereby effectively extending the symbol period. Reduce the influence of frequency selective fading caused by multipath. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing technology) is a special case of multi-carrier technology. It transmits complex exponential signals with rectangular pulse envelopes on each subcarrier, and adds cycles between adjacent time domain symbols. A prefix (Cyclic Prefix, CP fo...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies existing in the prior art, in order to solve the problem of low frequency offset estimation accuracy and poor estimation robustness of the filtering multi-tone modulation system, the present invention proposes an automatic frequency offset widely applicable to the filtering multi-tone modulation system and with high precision. Adaptive Recursive Frequency Offset Estimation Method

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