Filter bank multi-carrier channel estimation method and system, medium, terminal and application

Abstract

The invention belongs to the technical field of wireless communication, and discloses a filter bank multi-carrier channel estimation method, a filter bank multi-carrier channel estimation system, a medium, a terminal and an application. The filter bank multi-carrier channel estimation method comprises the following steps: respectively obtaining primary pilot frequency and secondary pilot frequencyposition channel estimation values by using an auxiliary pilot frequency method and a first-order linear interpolation method; calibrating the channel estimation value of the sub-pilot frequency position by using the sub-pilot frequency information, obtaining the channel estimation initial value with higher accuracy, and improving the channel estimation precision through feedback interference calculation, so the system performance is improved. Compared with an AP scheme, the method provided by the invention has the advantages that the sub-pilot frequency is increased, a more accurate overallchannel estimation value is obtained, and meanwhile, the method has stronger channel fast fading resistance. Compared with a conventional feedback interference calculation method, an algorithm is proposed to calibrate the channel estimation initial value, the channel estimation initial value with higher accuracy is obtained, and then the iterative convergence speed is higher, the estimation precision is higher, and the system performance is better.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a filter bank multi-carrier channel estimation method, system, medium, terminal and application. Background technique [0002] At present: FilterBank Multicarrier (FBMC) introduces a prototype filter with good time-frequency focusing characteristics for each subcarrier, compared with the traditional Orthogonal Frequency Division Multiplexing (OFDM) system. Higher spectrum utilization and smaller out-of-band leakage with more flexibility. Therefore, FBMC technology is a more potential multi-carrier technology, which has become a research hotspot and is widely used in wireless communication. However, in order to ensure the transmission rate, the offset quadrature amplitude modulation (OQAM) used by the FBMC system relaxes the orthogonal condition of the subcarriers, which causes the system to generate inherent interference, thereby affecting the performa...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing technology has discontinuous pilots in the time domain direction and cannot adapt to fast fading channels

[0005] (2) The pilot position of the existing technology is greatly affected by inherent interference, and it is impossible to obtain a more accurate channel estimation value

[0006] (3) The prior art combines iteration and signal detection to perform interference elimination method, the initial channel estimation is inaccurate, the convergence speed is slow, and the channel estimation performance is limited

[0007] The difficulty of solving the above problems and defects is: compared with the traditional CP-OFDM system, the OQAM / FBMC system has higher spectral efficiency, lower out-of-band interference and higher synchronization robustness. However, the OQAM / FBMC system uses Offset Quadrature Amplitude Modulation (OQAM) technology can only meet the requirements of quadrature in the real number domain, and there is inherent interference in the complex number domain

Under fast fading channels, this inherent interference will also show a more complex form and the size of the interference domain will also limit the pilot interval in the time domain, resulting in a huge challenge for OQAM / FBMC system channel estimation under fast fading channels

[0008] The significance of solving the above problems and defects is that the existing channel estimation algorithms for fast fading channels have problems such as inaccurate channel estimation, slow iterative convergence, and limited channel estimation performance.

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