Multi-Antenna Phase Rotation for Wireless Diversity Scheduling
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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 rotation based on whether frequency diversity or multi-user diversity is used, controlling the maximum delay time between antennas to optimize communication states, and includes a transmission unit for orthogonal pilot channels to improve channel estimation and antenna selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocks wide in frequency direction are allocated to obtain frequency diversity effect, then reliability is improved, but multi-user diversity effect deteriorates
Solution Approach 1:
The patent applies dynamic phase rotation to transmission signals based on channel conditions and user requirements. The phase rotating unit dynamically adjusts phase rotation amounts for different users and frequency blocks, enabling the system to switch between frequency diversity and multi-user diversity modes as needed, rather than being fixed in one mode.
Solution Approach 2:
The patent changes the phase rotation parameter dynamically based on channel state information and user scheduling requirements. By adjusting phase rotation amounts and patterns, the system can optimize for either frequency diversity (when channel conditions are poor) or multi-user diversity (when user scheduling is the priority), resolving the contradiction between these two effects.
2Productivity
If blocks narrow in frequency direction are allocated to obtain multi-user diversity effect, then productivity is improved, but reliability deteriorates
Solution Approach 1:
The system dynamically adjusts phase rotation parameters based on real-time channel conditions and user requirements. When multi-user diversity is prioritized, the phase rotating unit applies specific rotation patterns that enhance user differentiation. When reliability becomes critical, the system can switch to phase rotation patterns that emphasize frequency diversity, allowing flexible adaptation to changing conditions.
Solution Approach 2:
The patent modifies phase rotation parameters (amount, pattern, frequency) based on channel quality and scheduling needs. This parameter adjustment enables the system to optimize the balance between multi-user diversity and frequency diversity effects, improving productivity when conditions allow while maintaining reliability when needed.
3Reliability
If phase rotation is applied to control maximum delay time between antennas, then transmission quality is improved, but device complexity increases
Solution Approach 1:
The phase rotating unit operates autonomously based on pre-configured phase rotation patterns and channel state information. The system self-adjusts phase rotation without requiring complex real-time control mechanisms, as the phase rotation amounts and patterns are determined in advance or adaptively selected based on simplified channel measurements, reducing the complexity of the control mechanism.
Solution Approach 2:
The patent uses parameter-based phase rotation where rotation amounts and patterns are defined by configurable parameters rather than complex control algorithms. This approach improves transmission quality through phase diversity while keeping the device complexity manageable by relying on parameter adjustment rather than sophisticated control mechanisms.
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 phrase rotating unit adds first phase rotation for controlling the maximum delay time between the plurality of transmission antennas depending on whether transmission is performed using frequency diversity or transmission is performed using multi-user diversity and second phase rotation for controlling the phases of the arbitrary antennas among the plurality of transmission antennas based on the information.