Random place in channel frequency deviation estimation and compensation method

A random access channel and frequency offset estimation technology, which is applied in the field of communication, can solve the problem of insufficient data frequency offset estimation, too many frequency offset values, and high-quality frequency offset compensation during access message demodulation. And other issues

Inactive Publication Date: 2007-08-22
ZTE CORP +1
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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 o...

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  • Random place in channel frequency deviation estimation and compensation method
  • Random place in channel frequency deviation estimation and compensation method
  • Random place in channel frequency deviation estimation and compensation method

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[0038] The device and method for estimating and compensating the frequency offset of the random access channel of the present invention will be described in detail below in conjunction with the corresponding drawings and specific embodiments.

[0039] Fig. 1 is the flowchart of the frequency offset estimation and compensation method of the random access channel of the present invention. As shown in Fig. 1, the frequency offset estimation and compensation method of the random access channel of the present invention comprises the following steps: Preset frequency offset compensation is performed on the leading part of the channel, and correlation integration and non-correlation integration are performed, and preamble detection, frequency offset pre-estimation and multipath preselection are performed according to the processed correlation value, and one or more preselected multipaths are determined; step S104 , perform descrambling, despreading and frequency offset pre-compensatio...

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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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Application Information

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IPC IPC(8): H04Q7/38H04B1/707H04B1/12H04W88/08
Inventor 梁立宏
Owner ZTE CORP
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