Coherence Interval User Selection in Wireless Data Transmission
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Solution Overview
Problem
In wireless communication systems with multiple antennas, efficiently informing users whether they are selected for data transmission within short coherence intervals is challenging, leading to potential packet synchronization loss and throughput degradation due to the need for reliable dedicated signals.
Innovation Solution
Implementing a method where users are selected with a predetermined probability over multiple coherence intervals, transmitting data without explicit selection indication, and using error correcting codes to ensure reliable data transmission, allowing users to decode received signals without hard decisions on selection status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated signals are transmitted to inform users of selection status, then reliability of user selection notification is improved, but system throughput is degraded due to signal transmission occupying entire coherence interval
Solution Approach 1:
The patent extracts the selection notification function from dedicated signaling and embeds it within the data transmission process itself. By using the data symbols to carry selection information implicitly, the system eliminates the need for separate dedicated signals, thereby maintaining reliability while preserving throughput.
Solution Approach 2:
The data transmission process is made multi-functional: it simultaneously conveys both the actual data payload and the selection status information. The same transmission resources serve dual purposes - data communication and selection notification - eliminating the need for separate dedicated signals.
2Reliability
If dedicated signals are transmitted with long duration to ensure reliable reception, then selection error probability is reduced, but coherence interval is consumed leading to throughput degradation
Solution Approach 1:
The patent merges the selection notification function with the data transmission function. By combining both purposes into a single transmission process, the system achieves reliable selection information delivery without requiring additional time resources that would consume the coherence interval.
Solution Approach 2:
The useful action of data transmission continues uninterrupted throughout the coherence interval. By embedding selection information within the ongoing data transmission rather than using separate dedicated signals, the system maintains continuous useful action without time loss.
3Productivity
If users are selected based on highest throughput channels, then system throughput is maximized, but packet synchronization is lost when unselected users assume data is being transmitted
Solution Approach 1:
The patent implements feedback mechanisms where users receive implicit feedback about their selection status through the data transmission process itself. This feedback allows users to understand when they are selected and when they are not, maintaining synchronization while preserving throughput optimization.
Data Source
AI summary
Various methods and devices are provided to address the need for improved data transmission with coherence interval user selection. In one method, a transmit group to which to transmit during a first coherence time interval is selected. The transmit group is selected (101) from a plurality of users for which there is data to transmit during the first coherence time interval. The data associated with users in the transmit group is transmitted (102) to the transmit group during the first coherence time interval. Subsequent transmit groups to which to transmit during subsequent coherence time intervals are also selected (103). A user of the plurality of users is selected for transmission over the course of the first coherence time interval and the subsequent coherence time intervals with a predetermined probability.