Pilot pattern allocation optimization method in digital amplitude modulation broadcast channel estimation

Abstract

The invention discloses a pilot pattern allocation optimization method in digital amplitude modulation broadcast channel estimation. By minimizing the overall correlation of the perception matrix corresponding to the pilot pattern, the allocation of the pilot pattern is modeled as a combinatorial optimization problem, and the problem is solved using an improved quantum genetic algorithm. Individuals are coded by adopting quantum bits to obtain an initial pilot frequency pattern set. The overall correlation serves as a fitness function. The fitness value of each individual in the initial pilotfrequency pattern set is calculated, and finally population individuals are updated through a quantum revolving door. The steps are repeated for many times, and the pilot pattern with the maximum fitness value is selected as the optimal deterministic pilot pattern. According to the method, the problems of small search space and low efficiency of the pilot pattern in the search process are solved by utilizing the improved quantum genetic algorithm, and the defect of falling into local optimum in the search process is avoided. The optimized deterministic pilot pattern can obtain accurate channelinformation with less pilot overhead, and the spectrum utilization rate is effectively improved.

Description

technical field [0001] The invention relates to the technical field of digital amplitude modulation broadcasting, in particular to an allocation optimization method of pilot patterns in channel estimation of digital amplitude modulation broadcasting. [0002] technical background [0003] DRM (Digital Radio Mondiale) is a digital amplitude modulation broadcasting technology for frequencies below 30MHz. Since the channel in the transmission process is a bandwidth-limited multipath fading channel, DRM adopts orthogonal frequency division multiplexing technology to resist multipath interference and effectively improve spectrum utilization efficiency. In order to obtain better system performance, both coherent demodulation and channel equalization at the receiving end need to obtain accurate channel state information. Traditional DRM channel estimation methods use equally spaced pilot patterns to detect channel selective fading. Due to the use of more pilot signals in this meth...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the present invention provides a method for optimizing the allocation of pilot patterns in digital AM broadcast channel estimation, which solves the problem of small search space and low efficiency of pilot patterns in the optimization process, and avoids falling into local optimum during the optimization process Defects

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