Wireless Link Adaptation Using Receiver-Selected MCS Feedback
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Solution Overview
Problem
60 GHz wireless communication systems lack channel reciprocity due to differing numbers of antennas at each station, leading to inefficient data throughput and the need for continuous feedback to adapt RF links, which results in slow adaptation and decreased performance.
Innovation Solution
Implement a system where one wireless device determines and transmits parameters such as channel quality or modulation and coding schemes to another device, allowing for faster adaptation of RF links by selecting optimal modulation and coding schemes and power levels based on received feedback, thereby reducing complexity and improving data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous feedback is implemented to adapt RF links in 60 GHz wireless communication systems, then link adaptation accuracy is improved, but system complexity and adaptation time increase
Solution Approach 1:
The patent applies preliminary action by having the receiving device pre-calculate and determine the optimal modulation and coding scheme (MCS) before transmission. The receiver analyzes channel conditions and prepares the optimal MCS in advance, which is then fed back to the transmitter. This eliminates the need for the transmitter to continuously adjust and test different MCS values, significantly reducing system complexity while maintaining accurate link adaptation.
2Adaptability or versatility
If multiple modulation and coding schemes are implemented to handle varying channel conditions, then adaptability to different environments is improved, but system complexity increases
Solution Approach 1:
The patent applies self-service by enabling the receiving device to autonomously determine the optimal MCS based on received channel parameters and local channel conditions. The receiver independently evaluates which modulation and coding scheme will provide the best performance and communicates this selection back to the transmitter. This self-determination capability allows the system to adapt to various channel conditions without requiring complex centralized control or multiple pre-configured schemes at the transmitter.
3Device complexity
If channel reciprocity is assumed to simplify the system, then device complexity is reduced, but accuracy deteriorates due to different antenna configurations at each station
Solution Approach 1:
The patent applies feedback by implementing a mechanism where the receiving device measures actual channel parameters and explicitly communicates the optimal MCS back to the transmitting device. This feedback loop allows the system to account for differences in antenna configurations and other asymmetric factors without assuming channel reciprocity. The transmitter uses this feedback information to accurately adapt its transmission parameters, achieving precise link adaptation despite the lack of channel reciprocity.
Data Source
AI summary
A method includes determining parameters corresponding to a communication channel, transmitting the parameters from a first wireless device to a second wireless device via the communication channel, wherein the parameters include at least one of (i) an estimated quality of the communication channel or (ii) a modulation and coding scheme (MCS) for transmission via the communication channel, receiving the parameters at the second wireless device, and based on at least one of the parameters, selecting a MCS for transmission from the second wireless device to the first wireless device via the communication channel.