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A low-complexity pilot allocation method based on user exchange

A pilot frequency allocation, low-complexity technology, applied in the field of communication systems, to achieve the effects of reducing complexity, maximizing overall performance, and reducing complexity

Active Publication Date: 2020-01-14
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this greedy-based allocation strategy can only achieve locally optimal performance

Method used

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  • A low-complexity pilot allocation method based on user exchange
  • A low-complexity pilot allocation method based on user exchange
  • A low-complexity pilot allocation method based on user exchange

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Embodiment

[0035] A low-complexity pilot allocation method based on user exchange, suitable for Massive MIMO systems, such as figure 1 As shown, it includes 3 equivalent hexagonal cells, each cell includes 1 central base station and 5 users, and 1 central base station serves 5 users at the same time, the system model diagram briefly describes the cell users and the central The configuration of the base station. It can be seen from the model diagram that due to the sharing of the same pilot, the base station will receive mutually interfering pilot information at the same time during uplink pilot estimation, and this mutual interference will cause pilot pollution; the specific steps include:

[0036] (1) Obtain the large-scale fading information from each user in each cell in the Massive MIMO system to each central base station according to the distance from the user to the central base station i, j ∈ [1, 2, ..., L], k ∈ [1, 2, ..., K], refers to the large-scale fading factor from user...

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Abstract

The invention relates to a low-complexity pilot distribution method based on user exchange. According to the method, the system performance basically consistent with that of an exhaustive traversal method can be realized with relatively low complexity; the influence of pilot pollution can be effectively reduced; the system and rate performance can be maximized with relatively low complexity, and the fairness among users can also be taken into consideration; and the complexity of the method is relatively low, so the practical application is facilitated.

Description

technical field [0001] The invention relates to a low-complexity pilot allocation method based on user exchange, which belongs to the technical field of communication systems. Background technique [0002] Pilot pollution is a widely studied problem in Massive MIMO systems. It is an interference problem caused by users sharing pilots. It generally occurs in TDD mode in Massive MIMO systems. In the TDD mode, the uplink and downlink channels are reciprocal, so the uplink estimated channel can be used as the downlink transmission channel. Since both pilot transmission and information transmission must be carried out within the coherence time of the channel, the length of the pilot is limited, which limits the number of available pilots in the system, thus making it inevitable for adjacent cells to Ground multiplexes pilots, and pilot pollution becomes an unavoidable problem in Massive MIMO. [0003] The pilot allocation with the optimization goal of maximizing the user rate p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04L5/00
CPCH04B7/0413H04L5/0048
Inventor 张海霞刘见花袁东风周晓天郭帅帅
Owner SHANDONG UNIV