Adaptive Multi-Antenna Modulation With Low RF Chain Complexity
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Solution Overview
Problem
MIMO systems with multiple antennas and RF chains are costly and complex, making them unsuitable for applications like WPAN, where a method to adaptively modulate data using a multiple antenna selection scheme is needed to maximize frequency efficiency and minimize antenna selection latency.
Innovation Solution
An adaptive modulation apparatus and method using a multiple antenna selection scheme, which includes an antenna selector, a target transmission rate decision unit, and a transmitter/receiver to select and adjust transmit and receive antennas based on channel conditions, allowing for efficient data transmission without the need for multiple RF chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas with multiple RF chains are used, then data transmission rate is improved, but hardware complexity and cost increase
Solution Approach 1:
The system segments the multiple antenna functions into separate transmit and receive sides, where only one RF chain is needed at the transmitter while the receiver handles multiple antenna signals. This segmentation allows achieving MIMO performance without requiring multiple RF chains at each end, thereby reducing hardware complexity while maintaining data transmission rate.
Solution Approach 2:
The single RF chain at the transmitter is designed to be universal and adaptable, capable of working with any of the multiple transmit antennas through the antenna selection mechanism. This multi-functionality allows the same RF chain to serve multiple antenna interfaces, reducing the need for dedicated RF chains for each antenna while maintaining system performance.
2Productivity
If multiple antennas with multiple RF chains are used, then data transmission rate is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the RF chain requirements to only one side (transmitter or receiver), the system reduces the total number of expensive RF components needed. This segmentation approach maintains the data transmission rate benefits of multiple antennas while significantly reducing manufacturing cost through fewer RF chains.
Solution Approach 2:
Instead of implementing multiple complete RF chains, the system uses a single RF chain design that is copied or reused across different antenna interfaces through the selection mechanism. This approach reduces manufacturing cost by avoiding the need to produce and assemble multiple identical RF chain sets.
3Productivity
If antenna selection is performed frequently, then frequency efficiency is improved, but antenna selection latency increases
Solution Approach 1:
The system performs preliminary channel quality measurements and antenna evaluations in advance of actual data transmission. By pre-assessing which antenna provides the best channel conditions and preparing the selection decision beforehand, the system can quickly switch antennas when needed without incurring significant latency during actual data transfer, thus improving frequency efficiency while minimizing selection latency.
Solution Approach 2:
The system implements a feedback mechanism where channel quality information is continuously monitored and fed back to the antenna selection controller. This feedback allows the system to make informed antenna selection decisions based on current channel conditions, optimizing frequency efficiency while the feedback timing is designed to minimize the latency introduced by the selection process.
Data Source
AI summary
An adaptive modulation apparatus and method using a multiple antenna selection scheme are provided. The adaptive modulation method using the multiple antenna scheme includes: selecting one transmit antenna from a plurality of transmit antennas; determining a target transmission rate of the selected transmit antenna to transmit the determined target transmission rate to a multiple antenna reception apparatus; receiving, from the multiple antenna reception apparatus, feedback information including information regarding whether to accept the target transmission rate; and transmitting data to the multiple antenna reception apparatus using the received feedback information.