Phase noise suppression method for large-scale MIMO orthogonal frequency division multiplexing system

A phase noise, orthogonal frequency division technology, applied in the field of wireless communication, can solve the problem of not providing phase noise suppression technology and so on

Active Publication Date: 2019-08-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Phase noise suppression method for large-scale MIMO orthogonal frequency division multiplexing system
  • Phase noise suppression method for large-scale MIMO orthogonal frequency division multiplexing system
  • Phase noise suppression method for large-scale MIMO orthogonal frequency division multiplexing system

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[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 for a large-scale MIMO orthogonal frequency division multiplexing system. According to the invention, multi-user communication is realized based on zero-forcing precoding; firstly, a training OFDM symbol is used for roughly estimating a composite channel, combining a physical channel and a zero-forcing precoding weight influence, of each user; then, an iterative algorithm is provided for information transmission OFDM symbols to jointly estimate data sequences and phase noiseand refine estimation of a composite channel, so that adverse effects of the phase noise in a large-scale MIMO orthogonal frequency division multiplexing system are effectively inhibited.

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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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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