MIMO Antenna Selection for Channel Diversity
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Solution Overview
Problem
In MIMO communication systems, multi-stream interference caused by signals from multiple transmit antennas complicates decoding, leading to decoding difficulties and reduced throughput, especially in channels with varying channel responses between transmit and receive antennas.
Innovation Solution
The method involves determining errors in initial data transmission attempts and performing reconfiguration by changing the selection of transmit and receive antennas or altering antenna properties to create different channel responses for subsequent transmission attempts, ensuring improved decoding through spatial diversity and distinct channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmit antennas are used to increase throughput, then data transmission rate is improved, but multi-stream interference increases causing decoding difficulties
Solution Approach 1:
The patent segments the transmission process into multiple attempts with different antenna selections. By dividing the decoding task across multiple transmission attempts with varying channel responses, the system reduces the complexity of decoding in any single attempt while maintaining high throughput through spatial multiplexing.
Solution Approach 2:
The patent dynamically changes the selection of transmit and receive antennas between transmission attempts. This dynamic reconfiguration creates different channel responses for each attempt, transforming the static interference problem into a dynamic one that can be resolved through multiple observations and combining.
2Measurement precision
If antenna selections are changed between transmission attempts to reduce interference, then decoding accuracy is improved, but system complexity increases
Solution Approach 1:
The patent changes the antenna selection parameters between transmission attempts. By varying which transmit and receive antennas are active, the system alters the channel response parameters to create more favorable decoding conditions without requiring complex signal processing changes.
Solution Approach 2:
The patent employs feedback mechanisms where the receiver detects errors in received data and requests retransmission with different antenna selections. This feedback loop enables the system to adaptively improve decoding accuracy by learning from previous transmission outcomes and adjusting antenna selections accordingly.
3Reliability
If retransmission with different antenna selections is performed, then data recovery is improved, but transmission time increases
Solution Approach 1:
The patent performs preliminary actions by selecting different antenna configurations before retransmission. By pre-planning alternative antenna selections and having them ready, the system can quickly switch to a more favorable configuration when retransmission is needed, minimizing the time penalty compared to adaptive selection methods.
Solution Approach 2:
The patent uses periodic retransmission with different antenna selections rather than continuous transmission. This periodic approach allows the system to maintain reliability through repeated attempts while managing transmission time by spacing attempts appropriately and combining results efficiently.
Data Source
AI summary
A communications system including a transmitting device having plural transmit antennas and a receiving device having plural receive antennas. When it is determined that an error has occurred in a first data transmission attempt in which data signals are transmitted from a first selection of transmit antennas for receipt at a second selection of receive antennas, a second data transmission attempt is performed in which the data signals are re-transmitted from a third selection of transmit antennas for receipt at a fourth selection of receive antennas. Before the second transmission attempt, a reconfiguration operation is performed to ensure the channel response between the transmit and receive antennas selected for the first transmission attempt is different to the channel response between the transmit and receive antennas selected for the second transmission attempt. Data is then recovered at the receiving device using information from the first and second transmission attempts.