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Channel estimation method based on channel partial reciprocity in FDD (Frequency Division Duplex) large-scale MIMO (Multiple Input Multiple Output) system

A large-scale technology for channel estimation, applied in channel estimation, baseband system components, baseband systems, etc., can solve the problems of low channel estimation accuracy and large feedback overhead, and achieve high CSI feedback accuracy, small feedback overhead, high The effect of spectral efficiency

Pending Publication Date: 2022-05-06
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a channel estimation method based on channel partial reciprocity in an FDD massive MIMO system, thereby solving the problem of low channel estimation accuracy in the existing FDD massive MIMO , Feedback on issues with high overhead

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  • Channel estimation method based on channel partial reciprocity in FDD (Frequency Division Duplex) large-scale MIMO (Multiple Input Multiple Output) system
  • Channel estimation method based on channel partial reciprocity in FDD (Frequency Division Duplex) large-scale MIMO (Multiple Input Multiple Output) system
  • Channel estimation method based on channel partial reciprocity in FDD (Frequency Division Duplex) large-scale MIMO (Multiple Input Multiple Output) system

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[0053] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0054] The present invention can be applied to wireless communication systems. It should be noted that the wireless communication systems mentioned in the embodiments of the present application include but are not limited to: Narrow Band-Internet of Things (NB-IoT), Global System for Mobile Communications (Global System for Mobile Communications, GSM), Enhanced Data rate for GSM Evolution (EDGE)...

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Abstract

The invention discloses a channel estimation method based on channel partial reciprocity in an FDD (Frequency Division Duplexing) large-scale MIMO (Multiple-Input Multiple-Output) system, which comprises the following steps of: transmitting and receiving a reference signal after broadband precoding through combined operation of BS (Base Station) and UE (User Equipment) by utilizing partial uplink / downlink reciprocity of channel angle-delay distribution; according to the basic idea, projection of a space-frequency domain is carried out in broadband uplink channel estimation, projection vectors occupying main channel energy are found, and then a downlink joint precoder is designed according to the projection vectors. Wherein the projection is realized through a feature vector of a broadband channel covariance matrix. According to the method, the sparsity of the channel in the angle domain and the time delay domain is utilized, and only non-negligible coefficients after projection are sampled, so that the channel estimation overhead is remarkably reduced.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a channel estimation method based on channel partial reciprocity in an FDD massive MIMO system. Background technique [0002] The large-scale commercialization of 5G cellular systems is gradually turning the concept of massive MIMO into reality. Due to the large number of antennas on the base station, massive MIMO can lead to higher spectral and energy efficiency than traditional MIMO. The basic idea of ​​massive MIMO is that the pairwise orthogonality between channel vectors of different user equipments (UEs) increases when the number of base station antennas increases. The stronger pairwise orthogonality between the channel vectors of different UEs allows the base station to have higher interference suppression capability. In other words, the narrow beams of massive antenna arrays reduce the leakage problem of transmitted signals, which is one of the main...

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Application Information

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IPC IPC(8): H04L25/02H04B7/0417
CPCH04L25/0242H04L25/025H04L25/0258H04B7/0417
Inventor 尹海帆
Owner HUAZHONG UNIV OF SCI & TECH
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