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Training sequence based OFDM integer-multiple frequency offset quick estimation method and system

A technology of integer multiple frequency offset and training sequence, which is applied in the field of fast estimation of OFDM integer multiple frequency offset, which can solve the problems of long capture time, large number of subcarriers, and long estimation time, etc.

Active Publication Date: 2015-05-13
SICHUAN JIUZHOU ELECTRIC GROUP
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Problems solved by technology

If the frequency offset range is large and the number of subcarriers is large, the estimation time required is relatively long
And the related operation consumes more multiplier resources, and the capture time is longer

Method used

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  • Training sequence based OFDM integer-multiple frequency offset quick estimation method and system
  • Training sequence based OFDM integer-multiple frequency offset quick estimation method and system
  • Training sequence based OFDM integer-multiple frequency offset quick estimation method and system

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0032] In this specific embodiment, the length of the training sequence is 1 OFDM symbol, the number of symbols is N=1024, the insertion interval ΔN=16, the insertion position of the training sequence in the frequency domain is p, and k is the OFDM...

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Abstract

The invention provides a training sequence based OFDM integer-multiple frequency offset quick estimation method and system. The training sequence based OFDM integer-multiple frequency offset quick estimation method comprises a transmitting-end signal processing method and a receiving-end signal processing method, wherein the receiving-end signal processing method comprises the steps of conducting FFT transformation on input signals, performing grouped summation operation and then sequentially performing integral-multiple frequency offset estimation and integral-multiple frequency offset compensation. On the basis of OFDM system receiving end timing estimation and a frequency offset estimation algorithm and starting with a whole OFDM receiving access demodulation algorithm, the integer-multiple frequency offset estimation algorithm is optimized, and the shortcomings of long capture time and high resource consumption of a traditional serial correlator are overcome. The capture time and the resource consumption are remarkably reduced, and meanwhile the requirements for quick capture and low resource consumption are met. The training sequence based OFDM integer-multiple frequency offset quick estimation method has linear complexity O(N) and is easily achieved through FPGA hardware.

Description

technical field [0001] The present invention relates to a method and system for fast estimation of OFDM integer multiple frequency offset based on training sequence, in particular to a fast estimation method for OFDM integer multiple frequency offset based on training sequence which is applicable to Orthogonal Frequency Division Multiplexing technology in the communication field . Background technique [0002] Orthogonal frequency division multiplexing technology (also known as multi-carrier frequency division multiplexing technology) OFDM is a special form of multi-carrier frequency division multiplexing technology. As early as the 1960s, foreign scholars proposed the concept of OFDM. Initially, OFDM was applied in military wireless high-frequency communication links. The invention of key algorithms such as FFT modulation of orthogonal subcarriers and cyclic prefix to solve subcarrier orthogonality, as well as the rapid development of digital signal processing and VLSI te...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2657H04L27/2662
Inventor 费炳超何奎龙杨南
Owner SICHUAN JIUZHOU ELECTRIC GROUP
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