Two-level codebook selection method in LTE-A (Long Term Evolution-Advanced) system

Abstract

The invention provides a two-level codebook selection method in an LTE-A (Long Term Evolution-Advanced) system, wherein a first-level codebook code word W1 is multiplied by a second-level codebook code word W2 to obtain a precoding matrix W, and according to different criteria, a user separately selects the W1 and the W2 and feeds back corresponding indexes PMI1 and PMI2. The two-level codebook selection method is applicable to the circumstance that linear and non-linear detectors are used by a receiver end, and under the premise of ensuring low computational complexity, the bit error rate of the system can be greatly decreased. In particular, for the circumstance that non-linear detectors, such as a maximum likelihood detector and a spherical detector, are used by the receiver end, the method can be used for sufficiently exploiting the potential performance advantages of the non-linear detectors. The two-level codebook selection method is applicable to the circumstance that the distance between cross polarised antennas of the transmitting end is the result of dividing the Lambda (the wavelength of transmitted electromagnetic waves) by 2 or the result of multiplying the Lambda by 4, and under both circumstances, the two-level codebook selection method can show high bit error rate performance.

Description

technical field [0001] The invention relates to the technical field of 3GPP LTE-Advanced (3rd Generation Partnership Project Long Term Evolution Advanced) physical layer transmission technology, in particular to a two-stage codebook selection method in an LTE-A system. Background technique [0002] With the rapid development of wireless Internet and multimedia mobile communication, users' demand for wireless data services is increasing, and traditional wireless communication systems are no longer sufficient to meet the increasing demand for reliability and large capacity. To this end, the International Telecommunications Standardization Organization 3GPP (Third Generation Partnership Project) has started research on LTE-Advanced (Long Term Evolution High Version). MIMO (Multiple Input Multiple Output) closed-loop space division multiplexing technology, as the core technology in the LTE-Advanced physical layer transmission technology, can greatly improve the capacity and conn...

AI Technical Summary

Problems solved by technology

[0004] For the defects in the prior art, the purpose of the present invention is to provide a two-level codebook selection method in the LTE-A system, which is characterized in that the two-level codebook is searched separately to avoid the complexity of joint search, while ensuring that the receiver Optimal Bit Error Rate Performance with Linear and Non-Linear Detectors

Images