Wireless MCS Feedback for Faster 60 GHz Link Adaptation
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Solution Overview
Problem
60 GHz wireless communication systems lack channel reciprocity due to differing numbers of antennas at each station, requiring explicit feedback for link adaptation, which leads to slow data throughput 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 (MCS) to another device, allowing for faster adaptation of RF links by selecting optimal MCS and power levels based on received feedback, thereby improving data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit feedback is implemented for link adaptation in 60 GHz wireless communication systems, then channel quality information can be obtained for MCS selection, but data throughput adaptation becomes slow and performance decreases
Solution Approach 1:
The patent implements a feedback mechanism where channel quality information is explicitly transmitted from one wireless device to another, enabling the receiving device to select appropriate MCS parameters. This feedback loop resolves the contradiction by providing necessary channel information while maintaining adaptation speed through efficient feedback transmission.
Solution Approach 2:
The system performs preliminary channel quality measurements and transmissions before data transmission begins, allowing both devices to have advance knowledge of channel conditions. This preliminary action enables faster adaptation during actual data transmission without requiring continuous feedback loops.
2Reliability
If multiple antennas with different numbers are used at each station for high gain and narrow beam transmission, then transmission security and interference reduction are improved, but channel reciprocity is lost
Solution Approach 1:
The patent acknowledges and exploits the asymmetric antenna configuration at different stations, where each station has a different number of antennas. Instead of assuming channel reciprocity, the system explicitly measures and transmits channel quality information from each station, accommodating the asymmetric setup while maintaining transmission security through narrow beam formation.
Solution Approach 2:
By implementing explicit feedback of channel quality information from each station, the system compensates for the loss of channel reciprocity. Each station independently measures and reports its channel conditions, allowing the system to adapt to the asymmetric antenna configuration while maintaining reliable and secure transmissions.
3Productivity
If high frequency signals at 60 GHz are used for multi-gigabit transmission, then data transmission rate is improved, but signal attenuation due to oxygen and precipitation increases
Solution Approach 1:
The system dynamically adjusts MCS parameters including modulation scheme, coding rate, and transmit power based on real-time channel quality feedback. This dynamic adaptation allows the system to maintain high data transmission rates when channel conditions are good while reducing to lower rates or adjusting power when attenuation due to oxygen or precipitation increases, optimizing the trade-off between productivity and energy loss.
Solution Approach 2:
The patent changes multiple transmission parameters including modulation order, coding rate, and transmit power level based on measured channel quality. By adjusting these parameters dynamically, the system can achieve multi-gigabit transmission rates under favorable conditions while adapting to signal attenuation caused by oxygen absorption and precipitation at 60 GHz frequencies.
Data Source
AI summary
A first wireless device including a receiver and a transmitter. The receiver includes a channel estimation module configured to receive, from a second wireless device over a communication channel, a training packet and estimate a quality of the communication channel based on the training packet, and a modulation and coding scheme (MCS) determination module configured to determine an MCS based on one or more of the training packet and the estimated quality of the communication channel. The transmitter is configured to transmit, to the second wireless device over the communication channel, an indication of the MCS determined by the MCS determination module.