Codebook generating method, codebook generating device and initial codebook generating method

Abstract

Disclosed are a code book creation method and device and an initial code book creation method, for a wireless communications system. The code book creation method includes: a step in which the amplitude or power for channel status information for channels between a plurality of transmission antennas and a reception antenna is obtained; and a step in which elements of a codeword for an initial code book are dynamically mapped to the plurality of transmission antennas and a first code book is generated, on the basis of the amplitude or the power. The initial code book creation method includes: a step in which prescribed elements of the codeword are set to have a prescribed phase resolution; and a step in which the other elements of the codeword are set so as to be arranged in order of gradually increasing or gradually decreasing phase resolution. The order of arrangement between elements having the same phase resolution is arbitrary and the phase resolution is the number of phases possible for all elements in the same position for all codewords in the initial code book. As a result, the accuracy of the code book and the performance of the system are improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, and in particular to a codebook generation method, a codebook generation device and an initial codebook generation method for single cell and multi-cell multi-antenna wireless communication systems. Background technique [0002] In the field of wireless communication, in order to suppress channel fading and increase channel capacity, a multiple-input multiple-output (MIMO) technology is proposed. In a wireless communication system using MIMO technology, signals are transmitted and received through a plurality of transmitting antennas and a plurality of receiving antennas, where data streams transmitted from each transmitting antenna are precoded to suppress interference between data streams. interference. In the codebook-based precoding technology, the same pre-defined codebook is pre-stored at the transmitting end and the receiving end (such as a downlink base station and user equi...

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Problems solved by technology

Similarly, if the existing codebook is directly applied to the CoMP system using aggregated PMI feedback, it will produce a large channel quantization error

In addition, since the number of cooperative base stations is uncertain, the number of transmitting antennas is also uncertain, so when designing the aggregated codebook of the CoMP system, the size of the codebook will vary with the number of antennas, which increases the work of codebook design volume and complexity

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