MIMO Reception Signal Multipath Block Division
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Solution Overview
Problem
In MIMO systems, achieving good transmission characteristics without increasing the number of reception antennas is challenging, especially in small-size devices, as the number of transmission antennas often exceeds the number of reception antennas, degrading transmission performance.
Innovation Solution
A communication system that includes a transmission device with multiple transmission antennas and a reception device equipped with a propagation channel response estimation unit, block division unit, and transmission signal detection unit, which uses interference cancellation and signal separation to detect and separate transmission signals without increasing the number of reception antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmission antennas is increased to achieve high-speed transmission, then transmission rate is improved, but transmission characteristics are significantly degraded when the number of transmission antennas exceeds the number of reception antennas
Solution Approach 1:
The reception signal is divided into multiple blocks based on multipath components. Each block corresponds to a specific time delay range, allowing the system to process different multipath components separately. This segmentation enables virtual increase in the number of reception signals, effectively resolving the contradiction between using more transmission antennas and maintaining good transmission characteristics with limited reception antennas.
2Reliability
If the number of reception antennas is increased to maintain good transmission characteristics, then transmission characteristics are improved, but the device size and complexity increase
Solution Approach 1:
The invention creates virtual copies of reception signals by dividing the reception signal into multiple blocks based on multipath components. Each block acts as a virtual reception signal, effectively increasing the number of available reception signals without physically adding more reception antennas. This copying approach maintains good transmission characteristics while avoiding the complexity and size increase associated with adding physical antennas.
3Reliability
If the number of reception antennas is increased to maintain good transmission characteristics, then transmission characteristics are improved, but it becomes difficult to mount antennas in small-size devices
Solution Approach 1:
The invention transitions from the spatial dimension to the time dimension by utilizing multipath components with different time delays. Instead of adding more reception antennas in space, the system divides the reception signal into multiple blocks based on time delay, effectively creating virtual reception signals in the time domain. This dimensional change allows small-size devices to achieve good transmission characteristics without increasing physical antenna count or device area.
Data Source
AI summary
A reception device which communicates with a transmission device including multiple transmission antennas, the reception device including: at least one reception antenna which receives multiple transmission signals transmitted by the transmission device from the multiple transmission antennas; a propagation channel response estimation unit which estimates propagation channel responses among the multiple transmission antennas and the reception antenna; a block division unit which divides a reception signal of at least one of the reception antennas into multiple blocks based on a multipath; and a transmission signal detection unit which detects the transmission signals transmitted by the transmission device based on the reception signal divided by the block division unit into the multiple blocks and the propagation channel responses estimated by the propagation channel response estimation unit. The transmission signal detection unit includes: an interference cancellation unit and a signal separation unit.