Virtual Antenna Receiver for Co-Channel Interference Suppression
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Solution Overview
Problem
Communication receivers face challenges in effectively recovering data due to co-channel interference and channel distortion, which hinder their ability to accurately receive and process signals.
Innovation Solution
The implementation of a receiver using virtual antennas, which involves oversampling and real/imaginary decomposition to form multiple virtual antennas, along with a pre-processor, interference suppressor, and equalizer, including a MIMO filter to suppress co-channel interference and intersymbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional receiver processes signals from a single antenna, then the device complexity is low, but co-channel interference and channel distortion severely degrade signal recovery quality
Solution Approach 1:
The patent creates virtual antenna copies by decomposing the complex-valued signal from a single physical antenna into multiple independent sample sequences (e.g., in-phase and quadrature components, or multiple time instances). These virtual antennas are mathematical copies that behave independently for interference suppression purposes, enabling MIMO-based processing without additional physical hardware
Solution Approach 2:
The patent transforms the single-antenna signal processing problem into a multi-dimensional problem by creating multiple sample sequences from one antenna signal. This is achieved through operations like taking real and imaginary parts, or sampling at multiple time instances, effectively adding dimensions to the signal space to enable spatial interference suppression techniques
2Reliability
If multiple physical antennas are used to suppress co-channel interference, then interference suppression performance improves, but hardware cost and device complexity increase
Solution Approach 1:
The patent creates virtual antenna copies by decomposing the complex-valued signal from a single physical antenna into multiple independent sample sequences (e.g., in-phase and quadrature components, or multiple time instances). These virtual antennas are mathematical copies that behave independently for interference suppression purposes, enabling MIMO-based processing without additional physical hardware
Solution Approach 2:
The patent replaces the mechanical/physical system of multiple antennas with a signal processing system. Instead of using multiple physical antenna elements to achieve spatial diversity and interference suppression, the invention uses mathematical operations (real/imaginary decomposition, oversampling) to create virtual antenna signals that can be processed using MIMO techniques
3Measurement precision
If the receiver uses signal processing techniques to combat channel distortion, then signal recovery accuracy improves, but processing complexity and computational load increase
Solution Approach 1:
The patent performs preliminary processing on the received signal by creating multiple sample sequences through real/imaginary decomposition and/or oversampling before the main interference suppression and equalization stages. This preliminary structuring of the signal enables more effective subsequent processing by the MIMO filter and equalizer, as the interference and distortion can be addressed in a multi-dimensional space
Data Source
AI summary
A receiver suppresses co-channel interference (CCI) from other transmitters and intersymbol interference (ISI) due to channel distortion using “virtual” antennas. The virtual antennas may be formed by (1) oversampling a received signal for each actual antenna at the receiver and/or (1) decomposing a sequence of complex-valued samples into a sequence of inphase samples and a sequence of quadrature samples. In one design, the receiver includes a pre-processor, an interference suppressor, and an equalizer. The pre-processor processes received samples for at least one actual antenna and generates at least two sequences of input samples for each actual antenna. The interference suppressor suppresses co-channel interference in the input sample sequences and provides at least one sequence of CCI-suppressed samples. The equalizer performs detection on the CCI-suppressed sample sequence(s) and provides detected bits. The interference suppressor and equalizer may be operated for one or multiple iterations.