Precoding Matrix Sharing for Wireless Coherent Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for cooperative communication between multiple multi-antenna base stations in wireless communications systems face challenges such as high signaling complexity, large feedback information requirements, and poor performance, particularly in methods involving distribution precoding and channel state information processing.
Innovation Solution
A precoding method where a serving base station and cooperative communication base stations employ an identical precoding matrix, weighting the precoding results with shared weight values, and feedback information including precoding matrix and weight vector information to enhance coherent composition gain without increasing complexity significantly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distribution precoding methods are used to improve coherent composition gain, then performance is improved, but signaling complexity and feedback information requirements increase
Solution Approach 1:
The patent applies copying by using a common precoding matrix that is shared across multiple base stations. Instead of each base station using independent precoding matrices, they copy and use the same matrix, which simplifies signaling while still achieving coherent composition gain through coordinated transmission.
Solution Approach 2:
The patent implements universality by designing a unified precoding framework that can be applied across multiple base stations with different antenna configurations. The common precoding matrix serves multiple functions: it enables coherent transmission, reduces feedback overhead, and works universally across different network deployments.
2Adaptability or versatility
If independent precoding matrices are used at each base station, then adaptability to individual channels is improved, but feedback information requirements and processing complexity increase
Solution Approach 1:
The patent merges the precoding functions of multiple base stations by using a common precoding matrix. This consolidation reduces the amount of feedback information needed, as users no longer need to provide separate channel state information for each base station's independent precoding matrix, while still achieving coordinated transmission.
3Productivity
If complex precoding processing is applied to improve transmission performance, then data transmission rate is improved, but computational complexity and processing overhead increase
Solution Approach 1:
The patent employs simpler precoding matrices that are easier to compute and update. Rather than using complex, highly adaptive matrices that require extensive processing, the system uses simpler matrices that can be updated more frequently with lower computational overhead, maintaining good transmission performance while reducing processing complexity.
Data Source
AI summary
The present invention provides a precoding method for use in a wireless communications system. According to the precoding method of the present invention, a serving base station and cooperative communication base stations employ an identical precoding matrix so as to weight transmission signals and then transmit them. The weighting stands for multiplication of results of overall precoding or each layer precoding process by weight values at the serving base station and the cooperative communication base stations. A user device corresponding to the serving base station and the cooperative communication base stations receives a signal which is obtained by an operation in which the serving base station and the cooperative communication base stations perform an identical precoding process and additively combine results of overall precoding or each layer precoding process with one another. The user device feeds back information which includes (i) precoding matrix information for the serving base station and the cooperative communication base stations, (ii) weight vector information for either overall precoding or layer precoding, and (iii) a quantized value of channel quality. This feedback information is thus advantageous in that its signaling information amount is small.