MIMO Radio System Isolation for Varying Link Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
MIMO systems for packet data transmission face performance degradation due to varying radio link qualities, where poor quality data streams can negatively impact other links when combined.
Innovation Solution
A MIMO system where multiple data packets are transmitted simultaneously via different subsets of paths, with the secondary station determining correct receipt and signaling this to the primary station for each packet, allowing for independent management of transmission parameters and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple data streams are transmitted simultaneously via MIMO system, then total data rate is increased, but poor quality radio links degrade overall system performance
Solution Approach 1:
The patent segments the communication system into multiple independent Single-Input Single-Output (SISO) links, where each antenna combination operates as a separate channel. This segmentation allows independent management of each link's data streams, preventing poor quality links from degrading overall system performance while maintaining high data rates through parallel transmission across multiple segments.
2Device complexity
If all data packets are transmitted via the same set of paths, then system complexity is reduced, but performance degrades under varying channel conditions
Solution Approach 1:
The patent implements dynamic path allocation where data packets are selectively routed through different antenna combinations based on real-time radio link quality assessments. This dynamic approach allows the system to adapt to varying channel conditions, directing traffic through optimal paths while maintaining manageable complexity through systematic selection criteria.
3Reliability
If data packets are transmitted via different subsets of paths, then system performance is enhanced by isolating poor quality paths, but system complexity increases
Solution Approach 1:
The patent applies local quality optimization by assigning different modulation and coding schemes to individual SISO links based on their specific radio link quality. Each antenna combination is treated with localized optimization strategies, allowing high-quality links to operate at higher data rates with more robust modulation while poor quality links use more conservative schemes, thereby enhancing overall system performance without excessive complexity.
Data Source
AI summary
A radio communication system comprises a communication channel for the transmission of data packets (302) from a primary station having a plurality of antennas to a secondary station having at least one antenna. The channel comprises a plurality of paths, and the primary station transmits a plurality of packets substantially simultaneously. Each of the plurality of packets is transmitted via a different subset of the plurality of paths, for example by arranging for each packet to be transmitted via a different antenna or antenna beam. The secondary station receives the plurality of data packets, determines whether each packet is received correctly and signals this determination (typically as an acknowledgement (304) or a negative acknowledgement (306)) to the primary station for each of the plurality of packets. The signaling may be by any convenient means, for example transmitting each acknowledgement or negative acknowledgement via a different subset of available uplink paths.