Super-resolution angle and time delay estimation based broadband channel estimation method

Abstract

The invention discloses a super-resolution angle and time delay estimation based broadband channel estimation method. According to the invention, aiming at a millimeter wave large scale MIMO system ina hybrid analog-digital coding architecture, in order to solve a problem of quantization error influence due to limited quantization angle grid resolution in a traditional compression sensing based broadband channel estimation method, sparsity of a millimeter wave channel it utilized, through designing training signals of a transceiving end, a classical spatial spectrum estimation method is introduced, so that pilot frequency expenditure required by channel estimation can be reduced substantially and an arrival angle and a leaving angle of the millimeter wave channel and a super resolution estimation value of corresponding multi-path time delay can be acquired with high accuracy. Therefore, channel estimation accuracy can be improved distinctively. Besides, according to the invention, phases of a phase shifter in a phase shift network corresponding to an analog pre-encoder and an analog combiner to limited quantization bits, so that practical system implementation is facilitated.

Description

technical field [0001] The invention relates to the field of channel estimation in mobile communication, in particular to wideband channel estimation based on super-resolution angle and time delay estimation in a millimeter-wave massive MIMO system under a hybrid analog-digital precoding architecture. Background technique [0002] With the explosive growth of mobile traffic services, it is foreseeable that the current LTE / LTE-A-based 4G mobile cellular network will find it increasingly difficult to meet this geometrically increasing capacity demand. Millimeter-wave massive MIMO (Multiple-Input Multiple-Output) technology is widely regarded as one of the key technologies in the physical layer to achieve the grand vision of a thousand-fold increase in communication network capacity. First of all, the millimeter wave frequency band (30-300GHz) has abundant spectrum resources, which can effectively alleviate the current shortage of spectrum resources. Secondly, the shorter wave...

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Problems solved by technology

[0006] In view of this, the present invention provides a wideband channel estimation method based on super-resolution angle and time delay estimation to solve the problem caused by the limited quantization angle grid resolution in the traditional wideband channel estimation method based on compressed sensing quantization error problem

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