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Time bias estimation device and method for orthogonal frequency division multiplexing system

A technology of time offset estimation and orthogonal frequency division, applied in the field of mobile communication, can solve the problems of link performance deterioration, increase system bit error rate, etc. Effect

Inactive Publication Date: 2011-01-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increase system bit error rate and degrade link performance

Method used

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  • Time bias estimation device and method for orthogonal frequency division multiplexing system
  • Time bias estimation device and method for orthogonal frequency division multiplexing system
  • Time bias estimation device and method for orthogonal frequency division multiplexing system

Examples

Experimental program
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Effect test

Embodiment 1

[0080] (101) First, calculate with the received frequency domain demodulation reference symbol and the local frequency domain demodulation reference symbol to obtain the pilot bit frequency domain channel estimation value of the target user; in the first embodiment, in the time slot slot_i and the antenna ka , the received sequence in the frequency domain is Y k，slot_i，ka , the local frequency domain pilot code is X k , then the pilot bit frequency-domain channel estimate H k，slot_i，ka As shown in the following formula:

[0081] H k , slot _ i , ka = Y k , slot _ i , ka X k = a k ,...

Embodiment 2

[0113] (201) First, use the received frequency-domain demodulation reference symbol and the local frequency-domain demodulation reference symbol to calculate and obtain the pilot bit frequency-domain channel estimation value of the target user; on the time slot slot_i and antenna ka, the frequency-domain reception sequence for Y k，slot_i，ka , the local frequency domain pilot code is X k , then the pilot bit frequency-domain channel estimate H k，slot_i，ka As shown in the following formula:

[0114] H k , slot _ i , ka = Y k , slot _ i , ka X k = a k , slot ...

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Abstract

The invention discloses a time bias estimation device and a time bias estimation method for an orthogonal frequency division multiplexing (OFDM) system. The time bias estimation method comprises the following steps of: acquiring a pilot-bit frequency domain channel estimation value of a target user according to a received frequency domain demodulation reference mark and a local frequency domain demodulation reference mark; transforming the acquired pilot-bit frequency domain channel estimation value to a time domain by using inverse Fourier transform; realizing pilot-bit channel estimation multiuser separation by computing the length of an effective channel shock response window of the target user, and performing time domain noise reduction treatment on each user on an antenna of the user; searching for a peak value of each user in the effective channel shock response window, and finding a main path position of a signal; and computing a time bias estimation value of the user accordingto the peak value corresponding to a main path and generating a time adjustment command word. The time bias estimation device and the time bias estimation method of the invention can effectively estimate the relative time bias between a base station and a terminal, simplify the computation method of the time bias, reduce device complexity and obtain an accurate estimation value even on a working site with a low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a time offset estimation device and method of an Orthogonal Frequency Division Multiplexing (OFDM) system in the mobile communication field. Background technique [0002] The LTE project is the largest new technology research and development project launched by 3GPP in the past two years. It improves and enhances the 3G air access technology. Compared with 3G, LTE (Long Term Evolution, long-term evolution) has more technical advantages, which are reflected in higher user data rate, packet transmission, reduced system delay, improved system capacity and coverage, and reduced operating costs. [0003] The LTE downlink adopts OFDM technology. OFDM has the characteristics of high spectrum utilization and anti-multipath interference. The OFDM (Orthogonal Frequency Division Multiplexing) system can effectively resist the impact of wireless channels. The LTE uplink transmission sche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26H04B1/707
CPCH04L27/2691H04L27/2671H04L27/2663H04L27/2695H04L27/2675H04L27/2686H04L27/2682
Inventor 李萍秦洪峰康凤岐
Owner ZTE CORP
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