Linear Equalization for Wireless MIMO Interference Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face processing delays and inefficiencies in removing inter-antenna interference (IAI) and inter-symbol interference (ISI) during single-carrier MIMO transmission, particularly due to matrix operations and cyclic prefix additions.
Innovation Solution
A wireless communication system that employs a transmitting station and receiving station apparatus, utilizing modulation units, training signal generation, linear equalization, and coefficient estimation to simultaneously perform transmission beam forming and equalization, thereby removing IAI and ISI while minimizing processing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If matrix operation is performed in units of blocks for transmission beam forming with cyclic prefix addition, then inter-antenna interference and inter-symbol interference are removed, but processing delay increases for a time corresponding to one block
Solution Approach 1:
The patent combines transmission beam forming and equalization into a single unified process. The equalization unit performs both functions simultaneously using tap coefficients, eliminating the need for separate block-based matrix operations and cyclic prefix additions, thereby reducing processing delay while maintaining interference removal capability
Solution Approach 2:
The system performs preliminary estimation of channel impulse response and calculation of tap coefficients using training signals before actual data transmission. This allows the equalization unit to immediately remove interference from data signals without requiring block-based processing delays, as the equalization parameters are pre-computed
2Loss of information
If block-based transmission beam forming is performed with cyclic prefix addition, then spatial and temporal information are included in channel impulse response, but processing complexity increases
Solution Approach 1:
The patent merges transmission beam forming and equalization into a single unified process. The equalization unit performs both functions simultaneously using tap coefficients, eliminating the need for separate block-based matrix operations and cyclic prefix additions, thereby reducing processing delay while maintaining interference removal capability
Solution Approach 2:
The system extracts channel impulse response information from training signals and uses it to compute tap coefficients for the equalization unit. This extracted information is then applied to remove interference from data signals without requiring complex block-based processing, simplifying the overall system while preserving channel information
Data Source
AI summary
According to the present invention, a transmitting station apparatus includes: a plurality of modulation units that modulates a plurality of streams into which transmission data is divided to generate a plurality of first data signals; a training signal generation unit that generates a known training signal; a linear equalization unit that linearly equalizes the plurality of first data signals using a tap coefficient for removing inter-antenna interference and inter-symbol interference and outputs second data signals on which transmission beam forming and equalization are simultaneously performed; and a plurality of transmitting station communication units that transmit the training signal or the second data signals to a receiving station apparatus and receive the tap coefficient from the receiving station apparatus, and a receiving station apparatus includes: a coefficient estimation unit that estimates a channel impulse response from the training signal and calculates the tap coefficient based on the channel impulse response; and a receiving station communication unit that receives the second data signals or the training signal and transmits the tap coefficient calculated by the coefficient estimation unit to the transmitting station apparatus.