A Coordinated Multipoint Transmission Precoding Method

A multi-point transmission and precoding technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as reduced precoding performance

Inactive Publication Date: 2017-05-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Therefore, the uplink and downlink equivalent channels in TDD mode are usually non-ideal reciprocity, which greatly reduces the performance of precoding

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  • A Coordinated Multipoint Transmission Precoding Method
  • A Coordinated Multipoint Transmission Precoding Method
  • A Coordinated Multipoint Transmission Precoding Method

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the embodiments of the present invention include but are not limited to the following examples.

[0039] The coordinated multi-point transmission system of the TDD mode of the present invention is characterized in that OFDM is used to resist multipath fading, the OFDM symbol cyclic prefix length is greater than the maximum multipath delay, and the FFT starting point of OFDM is located in the cyclic prefix without intersymbol interference. That is, timing synchronization error residual sampling d = "τ / T s ", satisfying "L / T s "-N CP ≤d≤0, the timing synchronization residue d only causes phase rotation exp(-j2πkd / N), where τ represents the actual timing synchronization error residue, d represents the timing synchronization error residual sampling, T s Indicates the sampling period, L indicates the maximum multipath delay, N CP Indicates the length of th...

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Abstract

This patent invents a coordinated multi-point transmission downlink precoding algorithm for timing synchronization reciprocity errors. In the application scenario where the timing synchronization reciprocity error is approximately constant, the algorithm will compensate such errors when designing the precoding vector or matrix through MMSE channel estimation, RVQ quantization feedback, LS error estimation, and linear interpolation. In the application scenario where the timing synchronization reciprocity error changes in real time, the algorithm maximizes the lower bound of the average SLNR through the probability density function of such errors to obtain a robust precoding vector or matrix. In the coordinated multi-point transmission system in TDD mode, compared with the traditional precoding algorithm, this algorithm can overcome the impact of timing synchronization reciprocity error on the orthogonality between precoding vectors or matrices, and better eliminate the interference between users or cells. interference and improve system capacity.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a cooperative communication system adopting Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology in Time Division Duplex (Time Division Duplex, TDD) mode. Background technique [0002] In recent years, in order to further improve spectrum efficiency and improve cell edge user throughput, coordinated multi-point transmission (Coordinated Multi-point Transmission, CoMP) has become a research hotspot in the communication field. Researchers have designed and improved a large number of precoding algorithms to completely eliminate or greatly reduce the interference between multiple users and inter-frequency cells. Since most precoding algorithms are based on ideal channel information (Channel Side Information, CSI) assumptions, the accuracy of CSI becomes the key to ensure the performance of joint precoding algorithms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 顾浙骐罗辑张忠培
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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