Multi-Antenna Phase Rotation for Multi-User Diversity
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Solution Overview
Problem
Conventional communication systems fail to achieve an adequate multi-user diversity effect due to limitations in allocated slot and receiver location in wireless communication systems.
Innovation Solution
A wireless transmitter with multiple antennas and a phase rotating unit that applies phase rotations to control delay times and phases, allowing for improved channel estimation and selection of optimal antennas for phase rotation, thereby enhancing multi-user diversity effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional allocated slot methods are used without phase rotation control, then device complexity is reduced, but multi-user diversity effect is insufficient
Solution Approach 1:
The patent applies phase rotation to transmission signals with different rotation amounts based on allocated slot information. By changing the phase parameter dynamically according to slot allocation, the system achieves better multi-user diversity effect without requiring complex structural modifications. The phase rotation amount is adjusted as a controllable parameter to optimize reception quality.
Solution Approach 2:
The patent performs preliminary phase rotation control on transmission signals before transmission based on pre-determined allocated slot information. By applying the appropriate phase rotation in advance according to the allocated slot, the system prepares optimal transmission conditions that improve multi-user diversity effect without adding complexity during real-time reception processing.
2Reliability
If phase rotation is applied to all transmission signals, then reception quality improves, but processing complexity increases
Solution Approach 1:
The patent applies phase rotation selectively based on allocated slot information rather than uniformly to all signals. Different phase rotation amounts are applied to different transmission signals according to their specific slot allocation, achieving improved reception quality where needed while avoiding unnecessary processing complexity for signals that don't require rotation.
Solution Approach 2:
The patent dynamically adjusts phase rotation amounts based on allocated slot information rather than using a fixed rotation scheme. The phase rotation is adapted dynamically according to the specific transmission conditions and slot allocations, optimizing reception quality while maintaining processing efficiency through condition-based adjustments.
Data Source
AI summary
A wireless transmitter includes: a plurality of transmission antennas; a phase rotating unit which adds phase rotation to signals which are respectively input to the plurality of transmission antennas, and a reception unit which receives information on phase control of arbitrary antennas among the plurality of transmission antennas from another party of communication, wherein the phase rotating units adds first phase rotation for controlling the maximum delay time between the plurality of transmission antennas and second phase rotation for controlling the phases of the arbitrary antennas among the plurality of transmission antennas based on the information.