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Method for searching best carrier frequency offset correction value

A technology of optimal carrier frequency and correction value, applied in multi-frequency code systems and other directions, can solve the problem of high complexity of traditional methods and achieve the effect of reducing algorithm complexity

Inactive Publication Date: 2011-01-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional method has high complexity when searching for the best CFO correction value, and propose a method for searching the best carrier frequency offset correction value at the receiver of the uplink of the mobile communication system

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  • Method for searching best carrier frequency offset correction value
  • Method for searching best carrier frequency offset correction value
  • Method for searching best carrier frequency offset correction value

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Embodiment Construction

[0017] Specific embodiments of the present invention will be given below in conjunction with the accompanying drawings. It should be noted that the parameters in the examples do not affect the generality of the present invention.

[0018] In order to facilitate the understanding of specific embodiments, the working principles of the transmitter part and the receiver part of the uplink of the OFDMA system compensated by CFO are firstly described, and the specific working principles are as follows figure 1 shown.

[0019] The transmitter part includes subcarrier mapping 1, IDFT 2, adding guard interval 3, D / A conversion 4, and frequency up-conversion 5. The specific working process is as follows: Consider an OFDMA system with M users, where each single user passes through an independent multiple channel to communicate with the base station. Assuming that there are N subcarriers in each OFDM symbol, the N subcarriers are evenly allocated to M users, so that each single user ha...

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Abstract

The invention discloses a method for searching a best carrier frequency offset correction value, relating to a method for searching the best carrier frequency offset correction value aiming at each single user when compensating a carrier frequency offset at a receiver of an uplink of a mobile communication system. Aiming at the problem that a traditional search method has higher complexity when searching the best carrier frequency offset correction value at the receiver of the uplink of the mobile communication system, the invention gradually narrows the search scope by using an iterative wayto search the best carrier frequency offset correction value. Compared with the traditional search method, the method of the invention greatly reduces algorithm complexity.

Description

technical field [0001] The present invention belongs to the field of mobile communication systems, and more specifically relates to searching for the optimal frequency offset (CFO, Carrier Frequency Offset) for each single user when compensating the carrier frequency offset (CFO) at the uplink receiver of the mobile communication system. Method for correcting CFO values. Background technique [0002] In the uplink of an Orthogonal Frequency Division Multiple Access (OFDMA, Orthogonal Frequency Division Multiple Access) system, the carrier frequency will be shifted due to factors such as the Doppler effect during signal transmission, and the difference between different users at the receiving end CFO will cause multi-user interference (MUI, Multi-User Interference). In order to suppress the MUI, it is necessary to estimate the CFO of the uplink, and then use a certain method at the base station to recover the orthogonality between the subcarriers by using the estimated CFO o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 王刚杨佳肖悦雷霞李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA