Polarized MIMO Broadcast Transmission for LOS Reception Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
MIMO systems experience degradation in reception quality in Line-Of-Sight (LOS) environments, particularly in spatial multiplexing systems, which affects broadcast or multicast communication, where high electric field strength is accompanied by poor service reception due to the increase in the Rician factor.
Innovation Solution
The implementation of a transmission method using antennas with specific polarization configurations, where one antenna in a base station transmits a signal with a particular polarization, and another antenna transmits the same signal with a different polarization, and vice versa between base stations, 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 as Rician factor increases
Solution Approach 1:
The patent changes the polarization parameter of transmit antennas to resolve the contradiction. By configuring at least one transmit antenna with circular polarization and others with linear polarization, the system maintains high transmission capacity while improving reception quality in LOS environments where Rician factor is high, thus resolving the contradiction between transmission speed and reception quality
2Device complexity
If single modulated signal is transmitted for simplicity, then system complexity is reduced, but reception quality is excellent only in NLOS environment
Solution Approach 1:
The patent introduces polarization diversity as an additional parameter dimension. By combining circular and linear polarization modes, the system achieves robust reception quality across both NLOS and LOS environments without significantly increasing overall system complexity, thus resolving the contradiction between simplicity and reception reliability
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, providing stable and high-quality service for broadcast or multicast communication by mitigating the degradation caused by increased Rician factors.
Implementation Method 1
transmitting a first transmit signal from a first antenna in the first base station, the first antenna having a first polarization; transmitting a second transmit signal from a second antenna in the first base station, the second antenna having a second polarization that is different from the first 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.