Precoding Weight Hopping for MIMO Reception Quality
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Solution Overview
Problem
MIMO systems experience degradation in reception quality in Line of Sight (LOS) environments, particularly in spatial multiplexing systems, leading to poor service delivery in broadcast or multicast communication despite high electric field strength.
Innovation Solution
Implementing a precoding scheme that regularly hops between predetermined precoding weight matrices to improve reception quality in LOS environments, ensuring suitable precoding matrices are used based on the direct wave conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing MIMO system is used to increase transmission speed, then productivity is improved, but reception quality deteriorates in LOS environments with high Rician factor
Solution Approach 1:
The patent applies dynamics by making the precoding matrix variable over time through periodic hopping. Instead of using a fixed precoding matrix, the system dynamically switches between multiple predetermined precoding matrices in a periodic manner, allowing the transmission system to adapt to LOS environment conditions while maintaining spatial multiplexing benefits.
Solution Approach 2:
The patent implements periodic action through regular hopping between multiple precoding matrices. The system periodically switches among predetermined precoding matrices according to a defined pattern, which helps mitigate the degradation of reception quality in LOS environments while preserving the high transmission speed capability of spatial multiplexing MIMO.
2Productivity
If conventional spatial multiplexing MIMO is used, then data transmission efficiency is improved, but service delivery reliability deteriorates in broadcast/multicast communication under LOS conditions
Solution Approach 1:
The patent makes the precoding configuration dynamic by implementing periodic hopping among multiple precoding matrices. This dynamic adjustment allows the system to maintain efficient data transmission while improving service delivery reliability in broadcast and multicast scenarios operating under LOS conditions.
Solution Approach 2:
The patent changes the precoding matrix parameter periodically over time. By switching between multiple predetermined precoding matrices according to a periodic pattern, the system modifies the transmission parameters to overcome LOS environment limitations, thereby maintaining both transmission efficiency and service delivery reliability.
3Device complexity
If fixed precoding is used in MIMO system, then device complexity is reduced, but reception quality deteriorates in LOS environments
Solution Approach 1:
The patent introduces dynamics with minimal complexity increase by implementing periodic hopping among a limited set of predetermined precoding matrices. This approach provides the benefits of dynamic adaptation to LOS environments while keeping the system relatively simple through the use of pre-defined matrix sets and regular hopping patterns.
Solution Approach 2:
The patent achieves improved reception quality in LOS environments through periodic hopping between predetermined precoding matrices. This periodic action provides adaptive performance enhancement without requiring complex real-time precoding optimization, thus maintaining reasonable device complexity while significantly improving reception quality.
Data Source
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AI summary
Disclosed is a transmission scheme for transmitting a first modulated signal and a second modulated signal over the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a baseband signal after a first mapping and a baseband signal after a second mapping by a precoding weight and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.