MU-MIMO Transmission Apparatus Signal Processing Reduction
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Solution Overview
Problem
The MU-MIMO BLAST ZF-THP system faces a significant increase in signal processing amount in the base station apparatus as the number of concurrent access users increases, limiting the improvement of spectrum efficiency.
Innovation Solution
The system generates transmission signals based on spatial correlation of channels between the base station and multiple reception apparatuses, using a transmission correlation coefficient to suppress the increase in calculation amount, and determines an ordering for transmission signals to optimize antenna usage, thereby maintaining high transmission performance without increasing signal processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MU-MIMO BLAST ZF-THP system performs ordering on transmission signals to improve transmission performance, then transmission performance is improved, but signal processing amount in base station apparatus increases greatly as number of concurrent access users increases
Solution Approach 1:
The patent extracts and utilizes only the essential spatial correlation information (transmission correlation coefficient) from channel characteristics, rather than performing complete channel matrix inversion and ordering calculations. This selective extraction maintains transmission performance while significantly reducing the signal processing burden in the base station apparatus as user count increases.
Solution Approach 2:
The patent changes the approach from calculating complete channel matrices to using simplified transmission correlation coefficients as key parameters. By transforming the problem into one that relies on these condensed parameters, the system achieves comparable transmission performance with substantially reduced computational complexity that does not scale linearly with user count.
2Productivity
If MU-MIMO system increases number of concurrent access users to improve spectrum efficiency, then spectrum efficiency is improved, but signal processing amount in base station apparatus increases
Solution Approach 1:
The patent extracts only the necessary spatial correlation characteristics needed for transmission signal generation, discarding redundant computational steps. This allows the system to support increasing numbers of concurrent users and improve spectrum efficiency while keeping signal processing requirements bounded rather than scaling with user count.
Solution Approach 2:
The transmission correlation coefficient serves multiple functions simultaneously: it characterizes spatial correlation, enables transmission signal generation, and provides ordering information. This multi-functionality eliminates the need for separate calculation processes, allowing spectrum efficiency to improve with user count without proportional increases in signal processing complexity.
3Adaptability or versatility
If beam-forming MU-MIMO performs linear filter multiplication to achieve space-multiplexing, then space-multiplexing between users is achieved, but spectrum efficiency improvement is limited
Solution Approach 1:
The patent transitions from linear filter multiplication to a parameter-based approach using transmission correlation coefficients. This change enables more flexible and adaptive space-multiplexing that is not constrained by linear algebraic operations, thereby achieving better spectrum efficiency while maintaining user separation capabilities.
Data Source
AI summary
To realize transmission performances equivalent to those of an MU-MIMO BLAST ZF-THP system without increasing a signal processing amount in a base station apparatus in a downlink MU-MIMO transmission system. A transmission apparatus is provided with a plurality of transmission antennas, generates a transmission signal addressed to each reception apparatus based on information indicating spatial correlation of channels to and from a plurality of reception apparatuses, space-multiplexes the generated each transmission signal in the same wireless resource, and transmits it to each reception apparatus. The transmission apparatus includes: an ordering determination part 601 which determines an order in which a transmission signal addressed to each reception apparatus is generated based on information indicating spatial correlation of channels; a linear filter generation part 603 which generates a linear filter based on the determined order; a THP part 605 which performs a THP process by using the determined order and the linear filter; and a linear filter multiplication part 607 which multiplies an output of the THP part 605 by the linear filter.