MIMO Receiver Feedback-Delay Compensation
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Solution Overview
Problem
MIMO communication systems face inconsistencies between transmission weights and reception weights due to feedback-delay, leading to degradation of transmission characteristics, which existing technologies have not adequately addressed.
Innovation Solution
The proposed MIMO communication system employs a method where the transmitter and receiver use feedback information to generate and adjust transmission weights, incorporating channel state estimation and feedback-delay compensation to synchronize transmission and reception weights, ensuring consistent communication channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback information is used to generate transmission weights, then transmission characteristics can be optimized, but feedback-delay causes inconsistency between transmission weights and reception weights
Solution Approach 1:
The system performs preliminary actions by generating transmission weights at the transmitter based on feedback information received from the receiver. The feedback information includes channel state information that is processed in advance to compensate for feedback-delay, ensuring that the transmission weights are generated consistently with the current channel conditions despite the time delay in feedback transmission.
Solution Approach 2:
The system employs feedback mechanisms where the receiver sends feedback information about channel state to the transmitter. This feedback loop allows the transmitter to adjust transmission weights based on actual channel conditions, improving both transmission characteristics and consistency between transmission and reception weights through continuous adaptation.
2Reliability
If feedback-delay compensation is implemented, then consistency between transmission weights and reception weights is improved, but system complexity increases
Solution Approach 1:
The system introduces an intermediary processing mechanism that handles feedback information and performs delay compensation. This intermediary layer processes the feedback signal, adjusts it for time-delay effects, and provides corrected channel state information to the transmitter, thereby reducing the direct complexity impact on the main transmission system while achieving consistent weight generation.
Data Source
AI summary
This invention provides an MIMO communication system and MIMO communication method. An MIMO receiver estimates state of each communication channel from the received signals received by #1 to #L antennas, generates feedback information according to the information of channel state, sends the feedback information to a transmitter through a feedback path, processes the feedback information in order to compensate feedback-delay of the feedback path, generate K*L proper reception weights by using the information of channel state and processed feedback information, multiplies the received #1 to #L substreams of respective #1 to #K signal streams by the proper #1 to #L reception weights, respectively, composes the #1 to #L weighted substreams to obtain respective composed #1 to #K signal streams and demodulate the composed #1 to #K signal streams, respectively, and combines the demodulated K signal streams to reproduce an original transmission signal.