Phase Noise Suppression Method for Large-Scale MIMO OFDM Systems

A phase noise and orthogonal frequency division technology, applied in the field of wireless communication, can solve the problems of failure to provide phase noise suppression technology and achieve the effect of phase noise suppression

Active Publication Date: 2021-07-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Despite the above theoretical results, these works failed to provide phase noise suppression techniques

Method used

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  • Phase Noise Suppression Method for Large-Scale MIMO OFDM Systems
  • Phase Noise Suppression Method for Large-Scale MIMO OFDM Systems
  • Phase Noise Suppression Method for Large-Scale MIMO OFDM Systems

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Embodiment Construction

[0072] The validity of the present invention is illustrated below in conjunction with accompanying drawing and simulation example:

[0073] In the simulation, the data symbol adopts 64QAM modulation mode, the pilot frequency in the channel estimation phase adopts complex exponential symbols with uniform and random phase distribution, and the pilot frequency in the data estimation phase adopts random BPSK symbols. In a multipath channel with channel vector length L=64 and sparsity of 6, the number of transmitting antennas M=128, the number of users is 5, the number of OFDM subcarriers is N=512, and the subcarriers are divided into t=128 blocks in the channel estimation stage, Assume N in each block c = N / t = The value of the equivalent channel on 4 subcarriers is the same.

[0074] figure 1 The influence of the number of iterations and s on data estimation is given, and the phase noise level is -75dB. At the same time, the result of direct demodulation without considering the...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a phase noise suppression method of a large-scale MIMO orthogonal frequency division multiplexing system. On the premise of realizing multi-user communication based on zero-forcing precoding, the present invention first uses training OFDM symbols to roughly estimate the composite channel of each user combined with the influence of physical channels and zero-forcing precoding weights, and then proposes a method for information transmission OFDM symbols An iterative algorithm to jointly estimate the data sequence, phase noise, and refine the composite channel estimate to effectively suppress the adverse effects of phase noise in massive MIMO OFDM systems.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a phase noise suppression method of a large-scale MIMO orthogonal frequency division multiplexing system. Background technique [0002] Since the base station adopts a large number of antennas, massive MIMO has advantages such as high spectral efficiency, high energy efficiency, and asymptotic optimality of linear processing techniques, and additional antennas help to focus energy to a smaller spatial area, thereby greatly improving throughput and radiant energy efficiency. Therefore, massive MIMO is considered to be a key enabling technology for future wireless communications. [0003] In order for massive MIMO to be feasible in practice, it is critical to implement base station antenna arrays using low-cost and low-power components. However, these components are prone to hardware impairments such as phase noise. Phase noise is the difference between the carrier ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B7/0413
CPCH04B7/0413H04L27/2691
Inventor 杨莹成先涛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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