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

A technology of frequency offset estimation and code division multiple access, applied in the direction of code division multiplexing system, multiplexing communication, transmission system, etc., can solve the problems of inaccurate frequency offset estimation, signal phase offset, frequency Inaccurate values ​​and other problems, to achieve the effect of reducing the amount of calculation, improving link performance, and eliminating the impact

Inactive Publication Date: 2006-03-01
ZTE CORP
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Problems solved by technology

But when the signal-to-noise ratio Eb / N0 is relatively small, the frequency offset value obtained by this algorithm is quite inaccurate
Moreover, due to the Doppler frequency shift in the Rayleigh fading channel, it will cause the phase shift of the signal itself, 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

[0038] The non-pilot symbols in the uplink dedicated physical control channel (Dedicated Physical Control Channel, DPCCH) in the wideband code division multiple access system are decoded to obtain the values ​​of the non-pilot symbols. Combined with the pilot symbols, a continuous received signal can be obtained. The method of Fourier transform is used in the present invention. The frequency offset estimation in the present invention is divided into two parts: large-scale frequency offset estimation and small-scale frequency offset estimation.

[0039] The specific process is as Figure 11 Shown:

[0040] 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 relatively fast, here we use the dedicated physical control channel data ...

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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 degraded. Therefore, we need to estimate the size of the frequency deviation and perform frequency devi...

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Application Information

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