A Pilot Pollution Suppression Method Based on Joint Optimization of Pilot Allocation and Power Control
A technology of pilot frequency allocation and power control, which is applied in the field of pilot pollution suppression based on the joint optimization of pilot frequency allocation and power control, which can solve the problems of small communication rate and pilot frequency pollution, so as to improve communication quality and minimum frequency efficiency Effect
Active Publication Date: 2020-11-13
CENT SOUTH UNIV
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[0004] Aiming at the problem of pilot pollution in the prior art, the purpose of the present invention is to provide a pilot pollution suppression method based on joint optimization of pilot allocation and power control, through joint optimization of pilot design and uplink power control, so as to To increase the minimum communication rate of cell users
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[0037] The scheme of the present invention will be further described below in combination with specific embodiments and accompanying drawings.
[0038] In this example, we consider a multi-cell multi-user TDD Massive MIMO system, which is composed of L hexagonal cells. In each cell, the base station located in the center of the cell is configured with M antennas, and simultaneously serves K single-antenna users randomly distributed in the cell (Kijk It can be expressed as:
[0039]
[0040] where g ijk is the small-scale fading factor, which obeys the circular symmetric complex Gaussian distribution, that is, CN(0,I M );
[0041] beta ijk is the large-scale fading factor, in general, it can be expressed as:
[0042]
[0043] here z ijk Represents shadow fading with a logarithmic distribution (i.e., 10log 10 (z ijk )) obey Gaussian distribution CN(0,σ shadow), r ijk Represents the distance from the kth user in the jth cell to the center base station of the ith ce...
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The invention discloses a pilot frequency pollution suppression method based on pilot frequency distribution and power control joint optimization. The method comprises the following steps: (1) receiving a pilot frequency signal, and carrying out channel estimation; (2) receiving an uplink data signal and carrying out signal detection; (3) establishing a maximized minimum frequency effect optimization target according to a derived progressive signal to interference plus noise ratio (SINR) expression; and (4) according to an optimization target, performing pilot frequency distribution and uplinkpower control optimization by utilizing a WGC-PD-UPC algorithm, the algorithm mainly adopting an alternate iteration method, and in the iteration process, firstly, fixing a large-scale fading factorto carry out uplink power control optimization, and then fixing uplink transmitting power to carry out pilot frequency distribution optimization. According to the pilot frequency distribution and uplink power control joint optimization method provided by the invention, the minimum frequency efficiency in the system is effectively improved under the condition that the calculation complexity is relatively low, so that the communication quality of cell edge users is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of signal processing in wireless communication, and in particular relates to a pilot pollution suppression method based on joint optimization of pilot allocation and power control. Background technique [0002] Massive MIMO technology has become one of the key technologies of 5G because it can greatly improve performance such as frequency efficiency, energy efficiency, and link reliability. In a massive MIMO system, the TDD mode of time division multiplexing is generally used for data transmission. This is because in the TDD mode, the reciprocity of the uplink and downlink channels within the same coherence time can be easily utilized to perform channel estimation based on the uplink pilot signal sent by the terminal. However, since the number of orthogonal pilots is limited by the coherence duration of the channel, and in order to ensure that more effective data can be sent within a certain coherence durat...
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IPC IPC(8): H04L5/00H04W52/14H04W52/24H04W72/04
CPCH04L5/0048H04L5/006H04W52/146H04W52/242H04W72/0473
Inventor 邓宏贵刘刚熊儒菁王文慧田丽丽杨凯
Owner CENT SOUTH UNIV