Coordinated multi-point transmission precoding method

A multi-point transmission and precoding technology, which is applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of precoding performance degradation

Inactive Publication Date: 2014-07-16
UNIV OF ELECTRONIC 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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  • Coordinated multi-point transmission precoding method
  • Coordinated multi-point transmission precoding method
  • Coordinated multi-point transmission precoding method

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Embodiment Construction

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

[0039] The TDD mode coordinated multipoint transmission system of the present invention is characterized by adopting OFDM 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 inter-symbol interference, That is, the timing synchronization error residual sampling d = "τ / T s ", satisfying "L / T s "-N CP ≤d≤0, the timing synchronization residual d only causes the phase rotation exp(-j2πkd / N), where τ represents the actual timing synchronization error residual, d represents the timing synchronization error residual sampling, T s Represents the sampling period, L represents the maximum multipath delay, N CP Represents the length of the cyclic prefix, k repr...

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Abstract

The invention discloses a coordinated multi-point transmission downlink precoding algorithm for timing synchronous reciprocity errors. In the application scene where the timing synchronous reciprocity errors are approximately constant, the errors can be supplemented by the algorithm when precoding vectors or matrixes are designed through MMSE channel estimation, RVQ quantized feedback, LS error estimation and linear interpolation. In the application scene where the timing synchronous reciprocity errors change in real time, the lower bound of SLNR can be averaged to the maximum degree by the algorithm through a probability density function of the errors, and then robust precoding vectors or matrixes are acquired. In a coordinated multi-point transmission system in a TDD mode, compared with a traditional precoding algorithm, the algorithm can avoid the influence of the timing synchronous reciprocity errors on the orthogonality between the precoding vectors or matrixes, better eliminate interference between users or cells, and increase the capacity of the system.

Description

Technical field [0001] The present invention belongs to the field of wireless communication, and particularly relates to a cooperative communication system in a Time Division Duplex (TDD) mode using Orthogonal Frequency Division Multiplexing (OFDM) technology. Background technique [0002] In recent years, in order to further increase spectrum efficiency and improve cell edge user throughput, 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 multi-users and cells with the same frequency. Since most of the precoding algorithms are based on ideal channel information (Channel Side Information, CSI) assumptions, the accuracy of CSI has become the key to ensuring the performance of the joint precoding algorithm. In CoMP, the TDD mode is based on the channel reciprocity feature, and the CSI ...

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 顾浙骐罗辑张忠培
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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