Multi-Antenna Interference Suppression Using Reverse Sequence Processing
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Solution Overview
Problem
Existing wireless communication systems face interference issues due to unknown communication timings and frequencies from other systems, leading to degraded demodulation performance as desired signals are inadvertently canceled along with interference signals during inter-antenna combining.
Innovation Solution
A communication apparatus with multiple receiving antennas performs sequence multiplication processing and generates unique weights for each antenna to vary interference forms, ensuring desired signals strengthen each other during interference suppression, thereby preventing cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inter-antenna combining processing is performed using weights generated to cancel interference components, then interference resistance is improved, but desired signal components may be canceled out together with interference waves, degrading demodulation performance
Solution Approach 1:
The patent segments the signal processing into distinct stages: first performing reverse sequence multiplication to transform interference patterns, then generating weights specifically for the transformed signals. This segmentation allows interference cancellation to be applied selectively without affecting desired signals.
Solution Approach 2:
The patent performs reverse sequence multiplication as a preliminary action before weight generation and combining. This preliminary transformation modifies the interference form in reception signals, creating a state where subsequent weight-based combining can cancel interference without harming desired signals.
2Object-affected harmful factors
If weights are generated to cancel interference waves in reception signals, then interference suppression is achieved, but desired wave components are also weighted and may be canceled out, resulting in degraded communication stability
Solution Approach 1:
The reverse sequence multiplication is performed as a preliminary action that transforms the reception signals into a domain where interference and desired signals have different characteristics. This allows subsequent weight generation to target interference specifically while preserving desired signals.
Solution Approach 2:
The patent changes the parameter representation of signals through reverse sequence multiplication, transforming interference forms before weight application. This parameter transformation creates a distinction between interference and desired signal characteristics, enabling selective suppression.
Data Source
AI summary
A receiver that is a communication apparatus includes a plurality of receiving antennas that receives, as reception signals, interference signals and desired signals transmitted by a transmitting apparatus that performs sequence multiplication processing at the time of transmission, and an interference suppressor that generates, for each of the receiving antennas, a weight used when combining the reception signals received by the respective receiving antennas, and performs inter-antenna combining that is combining of the reception signals, using the weights, to perform interference suppression on the reception signals. The interference suppressor performs reverse sequence multiplication processing on the reception signals to vary interference forms in the reception signals, generates the weights differently for different combinations of the reception signals on which to perform the interference suppression, and performs the interference suppression using, from among the generated weights, the weights by which the desired signals strengthen each other.