Composite Precoding Matrices for MIMO Wireless Systems
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Solution Overview
Problem
Current MIMO wireless communication systems lack precoding capabilities when using both spatial multiplexing and transmit diversity, resulting in decreased performance.
Innovation Solution
A base station equipped with a codebook selector and precoder that uses composite precoding matrices, combining power-sharing and diversity precoding matrices to enable precoding in both spatial multiplexing and transmit diversity scenarios, allowing for selection of appropriate precoding matrices for each communication session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unitary precoding is used for spatial multiplexing, then spatial multiplexing performance is improved, but transmit diversity capability deteriorates
Solution Approach 1:
The patent creates a universal precoding framework that works for both spatial multiplexing and transmit diversity modes. By defining composite precoding matrices that can adapt to different transmission modes, the system achieves multi-functionality where the same precoding structure serves both spatial multiplexing and transmit diversity requirements, resolving the contradiction between optimized spatial multiplexing performance and transmit diversity capability
Solution Approach 2:
The patent introduces dynamic adaptability through mode-dependent precoding matrix selection. The system dynamically switches between different precoding matrix types based on the transmission mode (spatial multiplexing or transmit diversity), allowing the precoding function to adapt its behavior to match the required operational mode, thereby maintaining performance in both scenarios
2Productivity
If precoding is optimized for spatial multiplexing only, then spatial multiplexing efficiency is improved, but system versatility deteriorates
Solution Approach 1:
The patent develops a universal precoding architecture where composite precoding matrices are designed to function effectively in both spatial multiplexing and transmit diversity modes. This multi-functional design ensures that precoding is available and effective regardless of the transmission mode being used, thereby improving system versatility without sacrificing spatial multiplexing efficiency
Solution Approach 2:
The patent employs parameter changes by selecting different precoding matrix types based on the transmission mode. For spatial multiplexing, unitary precoding matrices are used to optimize efficiency, while for transmit diversity, appropriate diversity-oriented precoding matrices are selected. This parameter adaptation allows the system to maintain high efficiency in spatial multiplexing while also enabling precoding functionality in transmit diversity mode
Data Source
AI summary
A base station capable of performing precoding in a wireless communication system is provided. The base station includes a plurality of codebooks and a codebook selector. Each codebook comprises a plurality of composite precoding matrices that are generated based on a corresponding diversity precoding matrix. The codebook selector is operable to select one of the codebooks for use in a communication session with a subscriber station.