Polarized MIMO Broadcast Transmission for LOS Reception Stability
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Solution Overview
Problem
MIMO systems experience degradation in reception quality in LOS environments, particularly in spatial multiplexing systems, where the Rician factor increases, leading to difficulties in broadcast or multicast communication.
Innovation Solution
A transmission method involving antennas with specific polarization configurations, where one base station transmits signals with alternating polarizations, and the other base station transmits signals with complementary polarizations, to improve reception quality in LOS environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing MIMO system is used to increase transmission speed, then transmission capacity is improved, but reception quality deteriorates in LOS environments
Solution Approach 1:
The patent divides the transmission system into separate transmission paths with different polarization characteristics. By segmenting the signal transmission into orthogonal polarization components (e.g., horizontal and vertical polarization), the system can simultaneously achieve high transmission capacity through spatial multiplexing while maintaining reception quality through polarization diversity, effectively resolving the contradiction between transmission speed and reception quality in LOS environments
Solution Approach 2:
The patent introduces polarization as an additional dimension to the traditional spatial multiplexing approach. Instead of relying solely on spatial separation for capacity enhancement, the system combines spatial multiplexing with polarization multiplexing, adding a new degree of freedom that enables simultaneous improvement of both transmission capacity and reception quality by exploiting the orthogonal polarization properties
2Reliability
If maximal ratio combination is used in LOS environment, then reception quality is improved for single modulated signal, but reception quality deteriorates in spatial multiplexing system
Solution Approach 1:
The patent applies different processing methods to different polarization components based on their local characteristics. By analyzing and processing each polarization branch according to its specific channel properties rather than applying uniform processing, the system achieves optimal reception quality while managing complexity through localized optimization strategies
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances reception quality in LOS environments, ensuring high-quality service during broadcast or multicast communication by stabilizing signal reception despite increased Rician factors.
Implementation Method 1
one antenna in a base station transmits a signal with a particular polarization, and another antenna transmits the same signal with a different polarization
Data Source
AI summary
When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal from the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.