Random place in channel frequency deviation estimation and compensation method

Abstract

A method for estimating and compensating of frequency deviation (FD) of random access channel includes carrying out preset FD compensation and correlation integration as well as non-correlation integration on leading part of random access channel to confirm a pre-selected multi-path, carrying out FD pre-compensation and correlation as well as non-correlation integration on DPCCH at pre-selected multi-path, canceling multi-path with integration valve being less than threshold, using residual FD estimation value to carry out residual FD compensation on DPPCH and FD pre-estimation value and residual FD estimation value to carry out FD compensation on DPDCH.

Description

technical field [0001] The invention relates to the communication field, in particular to a frequency offset estimation and compensation method of a random access channel. Background technique [0002] In an actual mobile communication system, there is a relative speed between the transmitting end and the receiving end, resulting in Doppler frequency deviation, which can reach hundreds of Hz; the transmitting end and the receiving end use their own clocks, causing the receiving end There is a frequency difference between the carrier of the received signal and the carrier of the signal transmitted by the transmitter, resulting in a fixed frequency offset, which may reach thousands of Hz at most. Due to the existence of these two frequency offsets, the maximum frequency offset range in high-speed mobile communications may be -1500~1500Hz, or even -1800~1800Hz, and frequency changes will cause channel fading, especially when the frequency offset is relatively large. Performanc...

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Problems solved by technology

[0005] For dedicated channels, Node B (Node B) can receive enough data for frequency offset estimation, while for random access channels, there are only one or two 10ms frames, and there is not enough data for frequency offset estimation. The variance is large. In addition, the range of frequency offset that needs to be estimated is large, and the choice of algorithm is limited to a certain extent.

[0006] During preamble detection, multiple fixed frequency offsets can be set to perform compensation and demodulation at the same time. However, since preamble demodulation requires a lot of software and hardware resources, the preset frequency offset value should not be too many, such as 3 to 5 , therefore, only relying on the preset frequency offset of the preamble to estimate the frequency offset, the frequency offset compensation in the demodulation process of the access message cannot be guaranteed with high quality

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