MIMO Receiver Two-Stage Demultiplexing Hardware Scale Reduction
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Solution Overview
Problem
As the number of antennas in MIMO communication systems increases, the hardware scale required for signal demultiplexing becomes impractically large due to the exponential increase in possible signal points, making it difficult to implement with conventional hardware.
Innovation Solution
A MIMO receiving apparatus and communication system that employs a two-stage demultiplexing process, where the first stage performs rough demultiplexing using linear computation and the second stage performs precision demultiplexing, reducing the computational load and hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to improve transmission speed, then the communication capacity increases, but the hardware scale becomes impractically large due to exponential increase in signal points
Solution Approach 1:
The patent divides the demultiplexing process into two separate stages: a first demultiplexing section that performs initial signal separation, and a second demultiplexing section that completes the demultiplexing. This segmentation reduces the computational complexity at each stage compared to performing all demultiplexing operations in a single stage, thereby making high-order MIMO (e.g., 4x4 or higher) implementable with practical hardware scales.
2Reliability
If the degree of multiplexing is increased to double diversity gain, then the transmission reliability improves, but the number of possible signal points increases exponentially making implementation difficult
Solution Approach 1:
By segmenting the demultiplexing operation into two sequential stages, the patent reduces the number of signal points that must be processed simultaneously at each stage. For example, in a 4x4 MIMO system with 16QAM, instead of processing 65,536 signal points in a single stage, the two-stage approach processes fewer signal points at each demultiplexing section, making high-diversity systems implementable with practical hardware.
Solution Approach 2:
The patent introduces a temporal dimension by processing demultiplexing in sequential stages rather than simultaneously. The first demultiplexing section processes certain signal components, and the second demultiplexing section processes the remaining components. This dimensional transformation from simultaneous to sequential processing reduces the computational burden and hardware requirements.
Data Source
AI summary
An MIMO receiver and MIMO communication system which can have a small hardware scale even if the number of antennas used for MIMO communication. In a radio communication device (200), a receiving section (220) receives a spatially multiplexed signal generated by mutually-different and spatially multiplexing transmission signals, a first signal demultiplexing section (230) subjects a linear operation to the received spatial multiplexed signal to demultiplex the spatial multiplexed signal, and a second signal demultiplexing section (240) demultiplexer the demultiplexed spatially multiplexed signal into the transmission signals. When the received signal is demultiplexed by a single demultiplexing, as the number of multiplexed spatial multiplexed signal increases, the demultiplexer becomes complicated, and the hardware scale increases. When the received signal is demultiplexed by a plurality of demultiplexings, the hardware scale is relatively small.