Multi-Antenna Receiver QR Decomposition Multi-Path Interference
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Solution Overview
Problem
MIMO communication systems face challenges in accurately detecting transmission symbols due to multi-path interference (MPI), which affects the diversity gain and data transmission rate, especially when the amount of MPI is high.
Innovation Solution
A multi-antenna signal receiving device with at least two antennas, utilizing QR decomposition and multi-path interference eliminating units to detect components corresponding to different paths, and combining these components to detect streams, while performing frequency domain equalization and Inverse Discrete Fourier Transform to remove MPI and enhance diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology uses multiple antennas to increase channel bits and provide high data transmission rate, then productivity is improved, but multi-path interference worsens detection accuracy
Solution Approach 1:
The received signal is segmented into multiple path components (direct path and reflected paths) using QR decomposition. The detector separately processes each path component by eliminating multi-path interference iteratively, allowing accurate detection of transmission symbols despite the presence of multiple paths
Solution Approach 2:
QR decomposition is introduced as an intermediary technique to transform the received signal into a form where multi-path interference can be systematically eliminated. The Q and R matrices serve as mathematical intermediaries that enable separation of signal components from different paths
2Measurement precision
If the amount of multi-path interference is high, then the complexity of signal processing increases, but detection accuracy deteriorates
Solution Approach 1:
QR decomposition is performed preliminarily to organize the received signal into a structured form before detection. This preliminary transformation simplifies subsequent multi-path interference elimination by providing a clear mathematical framework for separating signal components
Solution Approach 2:
The detector uses iterative feedback to eliminate multi-path interference. Detected symbols from previous iterations are fed back to refine the estimation of current symbols, progressively reducing the impact of multi-path interference and improving detection accuracy
Data Source
AI summary
Described herein is a multi-antenna signal receiving device that includes a plurality of reception antennas that is capable of maximizing a diversity gain while eliminating a multi-path interference (MPI). The device receives a first received signal of a first antenna that includes components corresponding to a plurality of first paths and the device receives a second received signal of a second antenna that includes components corresponding to a plurality of second paths. The multi-antenna signal receiving device detects a component corresponding to a first path among the plurality of first paths, and a component corresponding to a second path among the plurality of second paths.