OFDM MIMO Circulation Transmission for Low-Correlation Antenna Diversity
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Solution Overview
Problem
MIMO systems face performance degradation due to high correlation between transmitted and received data streams caused by antenna proximity, which limits data throughput and diversity benefits.
Innovation Solution
Implementing circulation transmission and interleaving techniques to minimize correlation between data streams, optimizing diversity in frequency, time, and space by using convolutional encoders, interleavers, and OFDM symbol or subcarrier-based circulation processors to enhance data separation and transmission across multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are placed close to one another due to device size limitations, then device compactness is improved, but correlation between transmitted and received data streams increases degrading system performance
Solution Approach 1:
The data stream is segmented into multiple independent streams that are transmitted through different antenna paths. The circulation transmission processor divides the original data stream into multiple substreams, each transmitted through different antenna combinations, thereby reducing correlation between antennas while maintaining compact device size
Solution Approach 2:
The patent introduces a new dimension of circulation transmission processing that operates across multiple antennas and time slots. By circulating data streams through different antenna combinations in a structured manner, the system transforms the spatial correlation problem into a manageable transmission pattern that exploits diversity across multiple dimensions
2Reliability
If circulation transmission is implemented to minimize correlation between data streams, then system performance and diversity benefits are improved, but device complexity increases
Solution Approach 1:
The circulation transmission processor performs multiple functions within a single device component: it segments data streams, manages antenna switching patterns, controls transmission timing, and coordinates circulation patterns. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity
Solution Approach 2:
The system dynamically changes transmission parameters such as antenna selection, circulation patterns, and data stream mapping based on channel conditions and performance requirements. By adjusting these parameters rather than requiring complex hardware reconfiguration, the system achieves improved performance with minimal increase in device complexity
Data Source
AI summary
System performance in wireless communication is improved by increasing diversity in time, space and frequency. In OFDM-based MIMO systems in which the number of antennas M is greater then the number of simultaneously transmitted OFDM symbols N, circulation transmissions according to the present invention improve signal diversity. In symbol-based circulation transmission, N antennas are chosen from the M available antennas to transmit the N OFDM symbols. In subcarrier-based circulation transmission, M output OFDM symbols are composed from the QAM-mappled samples of the N input OFDM symbols. These M output OFDM symbols are then transmitted from the M antennas simultaneously.