OFDM channel estimation method based on pilot frequency in colored noise background
A colored noise and channel estimation technology, applied in the field of pilot-based OFDM channel estimation, can solve problems such as loss and estimation performance degradation
Active Publication Date: 2014-07-30
SYSU CMU SHUNDE INT JOINT RES INST +1
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Most of the existing channel estimation algorithms are based on the assumption of white background noise, and their estimation performance in the background of colored noise tends to degrade, especially when the amplitude of the colored noise spectrum fluctuates greatly, the performance loss is more serious
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[0064] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0065] The idea of the method of the present invention is to use the characteristic of non-uniform distribution of the colored noise spectrum to design a pilot, and use the pilot to perform channel estimation. It is mainly divided into the following three steps: 1. Estimate the colored noise power spectrum; 2. Design the pilot according to the power spectrum; 3. Use the received pilot to estimate the channel.
[0066] (1) Estimate the colored noise power spectrum
[0067] Aiming at the link of "colored noise power spectrum estimation", the present invention proposes a method of using difference to obtain noise sequence, that is, to offset the influence of signal and channel on sequence by taking difference between received same OFDM symbols, thus Obtain raw data for power spectrum estimation. The...
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The invention discloses an OFDM channel estimation method based on a pilot frequency in the colored noise background. The method is mainly used for selecting the pilot frequency in the colored noise background. According to the OFDM channel estimation method, on the one hand, an optimum pilot frequency energy distribution formula is given, and the concept of spectrum pilot frequency is provided; on the other hand, the method for obtaining a noise sequence through difference calculation is provided for the noise power spectrum estimation algorithm. The new pilot frequency obtaining method is applied to actual channel estimation, so that the channel estimation method based on the spectrum pilot frequency is provided. The estimation method comprises the steps of estimating a colored noise power spectrum, designing the pilot frequency according to the power spectrum, and conducting channel estimation according to the received pilot frequency. The OFDM channel estimation method based on the spectrum pilot frequency has the better performance than a traditional method in the colored noise background.
Description
technical field [0001] The present invention relates to the technical field of communication, and more specifically, relates to a pilot-based OFDM channel estimation method under the background of colored noise. Background technique [0002] In the OFDM system, channel estimation methods are mainly divided into three categories: pilot-based estimation methods, blind estimation methods, and semi-blind estimation methods between the two. [0003] The pilot-based estimation method is the method of estimating by using the known pilot in the frequency domain signal. Its algorithm is simple and has relatively high precision. A certain transmission bandwidth is limited, so it will affect the transmission efficiency to a certain extent. [0004] The blind estimation method mainly uses signal processing technology to estimate the channel, such as using some statistical properties to estimate the channel. Compared with the pilot-based estimation method, the blind estimation method d...
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Inventor 戴宪华张程
Owner SYSU CMU SHUNDE INT JOINT RES INST