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FDD system downlink channel estimation method, base station, readable storage medium and equipment

A channel estimation and channel technology, which is applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems of poor accuracy and different optimal downlink pilots, and achieve the effect of improving accuracy and reducing uplink overhead

Inactive Publication Date: 2019-01-01
SHANGHAI TECH UNIV +1
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  • Summary
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AI Technical Summary

Problems solved by technology

However, since all users share the same downlink pilot, and different UEs have different optimal downlink pilots, the accuracy of downlink channel estimation for other UEs may be poor

Method used

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  • FDD system downlink channel estimation method, base station, readable storage medium and equipment
  • FDD system downlink channel estimation method, base station, readable storage medium and equipment
  • FDD system downlink channel estimation method, base station, readable storage medium and equipment

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Embodiment Construction

[0025] For an FDD system, the number of antennas of the base station is set to M, and the number of antennas of the user terminal is set to 1. The base station uses an Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) modulation scheme, and the number of subcarriers is N. The frequency domain pilot signal sent by the base station on the mth antenna is:

[0026]

[0027] Among them, S m is the frequency domain pilot signal sent by the base station on the mth antenna; S 0 As the base sequence, it is a diagonal matrix, and the diagonal elements are random numbers with zero mean and amplitude of 1, S 0 Randomly generated by the base station, the function is to randomize the interference of other cells; τ m is the pilot parameter corresponding to the frequency domain pilot signal sent on the mth antenna. Pilot parameter τ m The intuitive effect is to cyclically shift the channel impulse response of the mth transmitting antenna by ...

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Abstract

The invention discloses an FDD system downlink channel estimation method, a base station, a readable storage medium and equipment. The method includes generating downlink pilot signals when a downlinkchannel estimation demand exists, wherein the values of pilot parameters of each transmitting antenna corresponding to the downlink pilot signals are random integers within 0 - N-1, the values of thepilot parameters corresponding to each transmitting antenna are different from each other, N is the total number of subcarriers corresponding to the downlink pilot signals, and N > 1; sending the downlink pilot signals to user equipment; receiving the feedback information uploaded by the user equipment; and performing estimation on the downlink channel corresponding to the user equipment according to the feedback information. Thus, the accuracy of downlink channel estimation can be enhanced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a downlink channel estimation method of an FDD system, a base station, a readable storage medium and equipment. Background technique [0002] In a Frequency Division Duplex (FDD) Multiple-Input Multiple-Output (MIMO) system, uplink and downlink channels do not have the channel reciprocity of a Time Division Dual (TDD) system. When acquiring channel state information of a user equipment (UE), the base station needs to perform separate downlink channel estimation on the user equipment (UE). [0003] In the prior art, when performing downlink channel estimation, the base station first sends a downlink pilot signal to the UE. Each UE performs channel estimation according to the received pilot signal, and feeds back the estimated channel state information to the base station. In the traditional FDD system downlink pilot design, usually only for a specific UE, such a pilot desig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2692H04L27/2695
Inventor 罗喜良潘振岗
Owner SHANGHAI TECH UNIV
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