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Special up channel frequency deviation estimating method in code division multiplexing address system

A technology of frequency offset estimation and dedicated channel, which is applied in the direction of code division multiplexing system, multiplexing communication, transmission system, etc. It can improve the link performance, reduce the amount of computation, and eliminate the influence of frequency offset estimation.

Inactive Publication Date: 2008-03-05
ZTE CORP
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Problems solved by technology

[0013] When the signal-to-noise ratio Eb / N0 is relatively large, the frequency offset value obtained by the algorithm is relatively accurate, but when the signal-to-noise ratio Eb / N0 is relatively small, the frequency offset value obtained by the algorithm is quite inaccurate and due to There is a Doppler frequency shift in the Rayleigh fading channel, which itself will cause a shift in the signal phase, which will cause the frequency offset estimate to be more inaccurate

Method used

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  • Special up channel frequency deviation estimating method in code division multiplexing address system
  • Special up channel frequency deviation estimating method in code division multiplexing address system
  • Special up channel frequency deviation estimating method in code division multiplexing address system

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Embodiment Construction

[0037] Decode the non-pilot symbols in the uplink dedicated physical control channel (Dedicated PhysicalControl Channel, DPCCH) in the wideband code division multiple access system, and obtain the values ​​of the non-pilot symbols combined with the pilot symbols to obtain continuous received signals. In the present invention The method of using Fourier transform in the frequency offset estimation of the present invention is divided into two parts: large-scale frequency offset estimation and small-scale frequency offset estimation

[0038] The specific process is shown in Figure 11:

[0039] Step 1: During the initial channel establishment, large-scale frequency offset estimation is performed first. Since the frequency offset value will not exceed a few thousand Hz when the dedicated channel is established, and considering that the initial frequency offset estimation must be accurate and obtained relatively quickly, the dedicated physical control channel data in one frame is us...

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Abstract

A method for estimating frequency deviation of uplink special channel in CDMA system includes carrying out large dimension frequency deviation estimation then carrying out estimation for small dimension frequency deviation after calibration, using signal in special channel to remove off high frequency interference through low - pass filter and carrying out Fourier transform for partial data, carrying out mode sampling calculation on spectrum value for obtaining spectrum amplitude value being low -pass filtered, searching out frequency corresponding to data peak value.

Description

Technical field: [0001] The invention relates to a method for channel frequency offset estimation in a direct spread spectrum code division multiple access system in the field of wireless mobile communication, more specifically how to accurately perform frequency offset of an uplink dedicated channel in a wideband code division multiple access system (WCDMA) estimate. Background technique: [0002] In the third generation mobile communication system, due to the influence of wireless transmission channel and radio frequency local oscillator error, there is a certain deviation between the carrier center frequency of the base station receiving signal and the radio frequency local oscillator frequency of the base station. The range of frequency deviation is generally around plus or minus 1000 Hz. If this frequency deviation is not compensated, the reception performance will be reduced. Therefore, we need to estimate the size of the frequency deviation and perform frequency devia...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/12H04J13/00H04L25/02
Inventor 杨奕
Owner ZTE CORP
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