Precoding Signaling in MIMO Wireless Systems
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Solution Overview
Problem
In closed-loop MIMO systems, the transmission of precoding information consumes significant system resources, degrading overall throughput and capacity due to inefficient use of resources.
Innovation Solution
A method where the receiver generates a feedback message in response to a reference signal, assigns an identifier, and transmits it to the transmitter, allowing the transmitter to determine the data transmission format based on the feedback message, reducing the need for explicit precoding information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated pilots or explicit control information are transmitted to carry precoding information, then the receiver can accurately determine the transmission format, but system resources are inefficiently consumed and overall system throughput and capacity are degraded
Solution Approach 1:
The patent extracts and removes the dedicated pilot signals and explicit control information that were previously used to transmit precoding information. Instead, the system uses implicit signaling where the transmission format is determined by the receiver based on the feedback message index, eliminating the need for separate resource allocation for precoding information transmission.
Solution Approach 2:
The feedback message index serves multiple functions: it identifies the precoding matrix, indicates the transmission format, and enables the receiver to determine all necessary parameters for data reception. This multi-functional approach replaces the need for separate dedicated pilots and control information channels.
2Measurement precision
If dedicated pilots or explicit control information are transmitted to carry precoding information, then the receiver can accurately determine the transmission format, but overall system throughput and capacity are degraded
Solution Approach 1:
The patent removes the overhead of dedicated pilots and explicit control information that were consuming system resources. The transmission format determination is achieved through the feedback message index alone, freeing up resources for data transmission and improving overall system throughput.
3Quantity of substance
If implicit signaling is used where the transmitter determines transmission format based on feedback message index, then system resources are conserved, but the complexity of determining and coordinating transmission formats increases
Solution Approach 1:
The receiver pre-generates multiple feedback messages corresponding to different precoding matrices and stores them with assigned indices before actual data transmission. This preliminary preparation allows the transmitter to simply reference the stored feedback messages using the feedback message index, reducing real-time computational complexity.
Solution Approach 2:
The feedback message index acts as an intermediary that bridges the transmitter and receiver. Instead of directly exchanging complex precoding information, both parties use the compact index to reference pre-agreed feedback messages, simplifying the coordination process while conserving system resources.
Data Source
AI summary
A method for performing data transmission between a transmitter and a receiver. The method includes the steps of generating a feedback message at the receiver in response to data received from the transmitter, assigning an identifier for the feedback message, storing the feedback message in association with the identifier in the receiver, transmitting the feedback message and the identifier to the transmitter, determining, at the transmitter, transmission format for data to be transmitted to the receiver based on the feedback message received from the receiver; and transmitting data and a control message, by the transmitter, using the determined transmission format, with the control message comprising the identifier of the feedback message based on which the transmission format is determined.