A channel estimation method and device for ofdm system
A channel estimation and two-level channel technology, applied in multi-frequency code systems, baseband system components, etc., can solve problems affecting system demodulation performance and channel estimation performance degradation
Inactive Publication Date: 2016-11-30
POTEVIO INFORMATION TECH CO LTD
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This average method to remove noise will lead to poor channel estimation performance and ultimately affect system demodulation performance
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[0057] In order to make the technical principles, features and technical effects of the technical solution of the present application clearer, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.
[0058] The specific implementation process of the present invention will be described below by taking the uplink of the power grid system using multi-channel OFDM technology as an example. For power grid systems based on multi-channel OFDM technology, the spectrum distribution is discrete and consists of 40 discontinuous sub-bands, each with a bandwidth of 25kHz. The subcarrier spacing is 2kHz, and each OFDM symbol is 10 subcarriers. In order to improve the robustness and demodulation performance of the system, and overcome the influence of synchronization timing offset and system frequency offset, the existing channel estimation algorithm must be improved.
[0059] The implementation process of the channel es...
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This application discloses a channel estimation method for an Orthogonal Frequency Division Multiplexing (OFDM) system. By estimating and correcting the phase deviation in the frequency domain caused by timing for each subcarrier output by the initial channel estimation, the timing The channel estimation after phase correction is averaged to obtain the channel estimation average value, and the channel estimation carrying the timing deviation is obtained according to the channel estimation average value and the phase deviation between the estimated adjacent subcarriers as the secondary channel estimation output, and then according to the OFDM The phase deviation between symbols performs frequency offset compensation on the output of the second-level channel estimation, and obtains the third-level channel estimation with frequency deviation as the final channel estimation result, and finally sends the channel estimation and corresponding data to the equalizer for equalization. The application also discloses a channel estimation device for OFDM system. The technical solution of the present application can improve the accuracy of channel estimation within a certain range of timing deviation and frequency deviation, thereby improving system performance.
Description
technical field [0001] The present application relates to the technical field of mobile communication, and in particular to a channel estimation method and device for an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology. Its main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them to each sub-channel. transmission on the channel. [0003] If the channel changes little in a narrow band for a period of time, you can first use the simple least square (LeastSquare, LS) method to estimate the channel in this time-frequency range, and then calculate the average to achieve the effect of removing noise . [0004] The mathematical expression for channel estimation is as follows: [0005] Assuming exact timing and no frequency offset betw...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 闫亮李元柳冯绍鹏
Owner POTEVIO INFORMATION TECH CO LTD