A Method of Frequency Offset Estimation and Compensation
A frequency offset estimation and frequency offset estimation technology, which is applied to multi-frequency code systems, baseband system components, etc., can solve problems such as system performance degradation and slow frequency offset tracking, and achieve fast frequency offset tracking, faster speed, and increased resources Effect
Inactive Publication Date: 2017-08-04
POTEVIO INFORMATION TECH CO LTD
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According to the frequency offset estimation method in the prior art, when the instantaneous burst frequency offset is large, the frequency offset tracking is relatively slow, resulting in system performance degradation
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[0035] The technical solution of this application utilizes the pilot resources of the common frequency asynchronous frame and the resources on the synchronous frame, or utilizes the pilot resource of the common frequency asynchronous frame, the Physical Control Format Indicator Channel (PCFICH) resource and the resources on the synchronous frame , the frequency offset estimation is performed on each radio frame, thereby increasing the resources of the frequency offset estimation and effectively improving the performance of the frequency offset estimation. At the same time, the cycle of crystal oscillator adjustment is shortened to speed up the frequency offset convergence, so that when the instantaneous burst frequency offset is large, the frequency offset tracking is relatively fast, and the system performance is effectively improved.
[0036] In order to make the technical principles, features and technical effects of the technical solution of the present application clearer,...
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This application discloses a method for frequency offset estimation and compensation, including: A. setting the initial phase-locked loop factor alpha; setting the crystal oscillator adjustment period T; setting the current frame estimated frequency offset freqTemp=0; Whether the crystal oscillator adjustment period is reached, if it is step C, otherwise execute step D; C, use the current frame to estimate the frequency offset freqTemp to adjust the crystal oscillator; D, judge whether the currently received wireless frame is a synchronous frame; if it is a synchronous frame, use the synchronous frame If it is an asynchronous frame, use the received signal on the asynchronous frame to estimate the frequency offset of the asynchronous frame, and skip to step B. Compared with the prior art, the solution of the present application increases resources for frequency offset estimation, and effectively improves the performance of frequency offset estimation.
Description
technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a method for frequency offset estimation and compensation. Background technique [0002] A wireless communication system occupies a discontinuous spectrum bandwidth, and its schematic diagram is as follows figure 1 shown. Each physical channel with a frequency domain of 25kHz bandwidth is defined as a frequency point, up to frequency points. Each frequency point adopts OFDM technology, and all discontinuous frequency points are aggregated together, and the system performs unified scheduling and assigns them to users, which constitutes this communication system with carrier aggregation characteristics. [0003] In the wireless communication system, a wireless frame corresponding to each frequency point has a length of 25 ms and includes 45 OFDM symbols. The discontinuous frequency points of the wireless communication system are divided into common...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 王丽
Owner POTEVIO INFORMATION TECH CO LTD