Method and apparatus for processing channel evaluation result based on transformed domain and its receiver

Abstract

The present invention relates to mobile communication field, discloses a method as well as an apparatus for processing channel estimating result based on transform-domain, and a receiver. The method includes: obtaining channel estimating result; replacing the channel estimating result of the subcarrier with original channel parameter of the subcarrier at the borderline guiding-frequency position; correcting the channel estimating result of the subcarrier at the borderline guiding-frequency position; calculating and obtaining the channel estimating result of non guiding-frequency position subcarrier between the borderline guiding-frequency positions using interpolation according to the correcting result. According to the method, the present invention provides an apparatus for processing the channel estimating result based on transform-domain and a receiver. The present invention prevents the channel estimating result around the guiding-frequency position from aberrance, further improves the veracity of the channel estimating result. In addition, the present invention restraints noise heft larding within useful signal, so as to improve the performance of channel estimating result.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a transform domain-based channel estimation result processing method and device and a receiver of an orthogonal frequency division multiplexing system. Background technique [0002] Coherent detection at the receiving end needs to use channel information, so channel estimation is an important part of a receiver suitable for an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplex) system. In OFDM systems, pilot symbols are usually used to estimate the channel, because the pilot position subcarriers can be flexibly distributed in OFDM symbols. The method of using pilot symbols to estimate the channel is to insert some known pilot symbols at some fixed positions in the signal at the transmitting end, and use these pilot symbols at the receiving end to first estimate the channel coefficient of the subcarrier at the pilot position , and then ge...

AI Technical Summary

Problems solved by technology

[0005] Since the second channel estimation method in the prior art intercepts a limited number of samples in the transform domain, it is inevitable that the channel estimation value of the subcarriers near the boundary pilot will be distorted, and then the boundary pilot Inaccurate channel estimates for subcarriers near the location

Secondly, this method also uses a low-pass filter to filter the signal. The filtering method cannot filter out noise and interference in the reserved frequency band, and the selection of the cut-off frequency is determined by the energy and total energy in the passband. The size of the ratio It directly affects the effect of suppressing noise

Finally, if the mobile rate is high and the signal-to-noise ratio is high, the performance of channel estimation will deteriorate, but the channel estimation method does not give corresponding compensation measures

Therefore, the existing technology cannot overcome the distortion of the channel estimation value of the subcarriers near the boundary pilot position, and cannot filter out the noise and interference in the reserved frequency band

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