Antenna Weighting for Transmit Diversity
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Solution Overview
Problem
Existing antenna transmit diversity systems in wireless systems rely on approximation and simplifications due to factors like fading and environment changes, leading to reduced performance and practical antenna diversity gain.
Innovation Solution
The method involves using downlink signal quality measurements to establish relative transmission characteristics for multiple antennas, such as power and phase ratios, to optimize uplink transmission by predicting antenna performance and adjusting signal distribution based on received signal quality indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink signal quality measurements are used to dynamically adjust uplink antenna transmission characteristics, then antenna diversity performance and signal reliability are improved, but system complexity and computational requirements increase
Solution Approach 1:
The system performs preliminary measurements of downlink signal quality on each antenna before transmission, using these measurements to pre-determine optimal uplink transmission characteristics. This preliminary action allows the system to anticipate and adapt to channel conditions without real-time feedback delays, improving reliability while managing complexity through advance preparation
Solution Approach 2:
The system implements a feedback mechanism where downlink signal quality measurements from multiple antennas are used to adjust uplink transmission characteristics. The mobile station measures downlink quality, determines optimal antenna weighting and selection, and applies these adjustments to uplink transmissions, creating a closed-loop system that continuously optimizes performance based on measured conditions
2Reliability
If antenna transmission characteristics are adjusted based on real-time signal quality measurements, then signal strength and reliability improve, but processing time and measurement requirements increase
Solution Approach 1:
The system performs downlink signal quality measurements and determines optimal transmission characteristics in advance, before actual uplink transmission is needed. This preliminary determination of antenna weighting and selection based on downlink measurements eliminates the need for real-time processing during transmission, reducing time loss while maintaining signal reliability
Solution Approach 2:
The system dynamically adjusts transmission characteristics based on measured downlink signal quality, allowing adaptation to changing channel conditions. The mobile station continuously monitors downlink quality on each antenna and dynamically selects the optimal antenna and transmission parameters for uplink, balancing the need for real-time adaptation with processing time constraints
Data Source
AI summary
A method, system and apparatus for determining at least one relative characteristic of a transmit diversity transmitter based on at least one quality indicator based on signals received on the plurality of antennas. In some embodiments of the invention, the relative characteristic may be a relative power or amplitude ratio and/or a phase difference between the signals transmitted on the different antennas.