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A channel estimation method for ofdm/oqam system

A channel estimation and channel technology, which is applied in the field of OFDM/OQAM system channel estimation, can solve problems such as unsatisfactory bit error performance of the system, achieve the effects of not affecting resource consumption, improving bit error performance, and improving accuracy

Inactive Publication Date: 2019-12-03
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0006] What the present invention intends to solve is under the OFDM / OQAM system, the problem that the error performance of the system is not ideal when using the traditional channel estimation algorithm to eliminate the inherent interference and noise of the OFDM / OQAM system, and provides a channel estimation method for the OFDM / OQAM system

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  • A channel estimation method for ofdm/oqam system
  • A channel estimation method for ofdm/oqam system
  • A channel estimation method for ofdm/oqam system

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Embodiment Construction

[0025] The method of the present invention will be further elaborated below in conjunction with accompanying drawing and specific embodiment:

[0026] For the traditional FDA algorithm based on block pilot and IAM-C pilot structure, the pilot structure is designed in the frequency domain to calculate the frequency domain response of the channel. A more accurate channel frequency response (channel frequency response, CFR) is obtained by weighting and averaging the channel frequency domain response of the designed pilot. First, add IAM-C to design the pilot structure at the front end of the transmitted data, and then periodically insert the block pilot symbols into the transmitted data. Therefore, the channel response can be obtained through the traditional pilot channel estimation algorithm, and then a more accurate channel frequency domain response can be obtained by averaging the channel frequency domain response of the designed pilot.

[0027] Based on the above elaboration...

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Abstract

The present invention discloses an OFDM / OQAM system channel estimation method. On the basis of the FDA algorithm based on block-type pilot, the channel frequency-domain response is obtained firstly. In the time domain, the channel energy is mainly concentrated on a limited number of sampled points. The channel energy is converted into the time domain through IFFT operation for realizing the zeroing operation in the interference area. After that, the FFT operation is conducted, so that the final frequency-domain response is obtained. Based on the above method, the zeroing operation is conducted on a large number of time-domain sampling points only with the presence of the channel noise and the inherent interference. Therefore, the influence of the interference on the accuracy of the channel estimation is further reduced, so that the higher estimation accuracy is obtained. Meanwhile, on the premise that a certain complexity is guaranteed, the error code performance of the OFDM / OQAM system is improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for channel estimation in an OFDM / OQAM system. Background technique [0002] As one of the alternative modulation schemes for the 5G physical layer, the offsetquadrature modulation based orthogonal frequency division multiplexing (OFDM / OQAM) technology has attracted more and more attention from the academic community. Compared with traditional OFDM systems, OFDM / OQAM has the following characteristics and advantages: First, the energy of OFDM / OQAM pulses can be well concentrated in both time domain and frequency domain, so the system no longer needs a cyclic prefix (CP ) As a protection, the spectral efficiency and effective transmission power of the communication system are improved; secondly, the orthogonality condition is relaxed from the strict orthogonality in the complex domain to the strict orthogonality in the real domain, which is a good focusing characteri...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L5/00
CPCH04L5/0048H04L25/0202H04L25/0218H04L25/022
Inventor 李燕龙王波仇洪冰郑霖杨超李环宇玉赛波唐亚欣
Owner GUILIN UNIV OF ELECTRONIC TECH
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