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Uplink pilot frequency sequence configuration method and base station

A technology of pilot sequence and configuration method, which is applied in the directions of pilot signal allocation, allocation standard, transmission path sub-channel allocation, etc., to reduce pilot pollution and ensure communication quality

Active Publication Date: 2018-05-11
SHANGHAI TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is how to reduce the pilot frequency pollution of the mobile user terminal

Method used

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  • Uplink pilot frequency sequence configuration method and base station
  • Uplink pilot frequency sequence configuration method and base station
  • Uplink pilot frequency sequence configuration method and base station

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Embodiment Construction

[0028] In the prior art, the TDD system designs a sufficient number of orthogonal pilot sequences, and continuously sends pilots within the channel coherence time for channel estimation, so as to avoid the impact of pilot pollution on communication quality. When continuously sending pilots for channel estimation within the channel coherence time, the channel needs to be kept constant for a period of time, that is, the coherence time is relatively long.

[0029] However, for a user terminal moving at a certain speed, since the channel of the mobile user terminal changes quickly with time, the coherence time is short, and the length of the pilot sequence is limited, which limits the number of orthogonal pilot sequences. Therefore, for user terminals in a mobile state, there is still the problem of relatively serious pilot pollution.

[0030] In the embodiment of the present invention, the reference pilot sequence corresponding to the user terminal is shifted in time domain by us...

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Abstract

The invention discloses an uplink pilot frequency sequence configuration method and a base station. The configuration method comprises the steps of receiving uplink data sent by user terminals in a located service cell; estimating power spectral densities corresponding to the user terminals and power spectral densities corresponding to noises according to the uplink data under a time selective fading model; calculating a first phase shift coefficient corresponding to the user terminals according to the power spectral densities corresponding to the user terminals and the power spectral densities corresponding to the noises; performing time domain phase shift on a reference pilot frequency sequence of the user terminals by adopting the first phase shift coefficient, and configuring an uplinkpilot frequency sequence corresponding to the user terminals, wherein a proportion of the configured power spectral densities corresponding to the user terminals and power spectral density overlappedareas corresponding to other user terminals in the service cell on a frequency domain in the power spectral densities corresponding to the user terminals is not greater than a first preset value. According to the above scheme, the pilot frequency pollution of user terminals in a moving state can be reduced.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to an uplink pilot sequence configuration method and a base station. Background technique [0002] In a massive Multiple Input Multiple Output (MIMO) system, as the number of antennas increases, the number of channels to be estimated also increases linearly, resulting in an increase in the difficulty of channel estimation. For a Time Division Duplex (TDD) system, the base station can estimate the uplink channel according to the uplink pilot sent by the user terminal, and obtain the downlink channel according to channel reciprocity. [0003] However, when different user terminals send the same or similar pilots, the base station cannot distinguish the difference between the pilots sent by the user terminals, causing the estimated channel to be inconsistent with the actual channel, resulting in pilot pollution. [0004] In the prior art, the TDD system designs a sufficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048H04L5/006H04L5/0073
Inventor 罗喜良潘振岗
Owner SHANGHAI TECH UNIV
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