Antenna Allocation for Cyclic Delay Diversity Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in improving the quality of uplink transmission, particularly in multiple-access systems where efficient allocation of antennas for cyclic delay diversity (CDD) is needed to combat fading and interference.
Innovation Solution
The method involves estimating transmission channel qualities of multiple antennas, identifying a single antenna with the best channel quality, and allocating cyclic delay diversity signals with minimal delay and optimal power distribution across antennas based on channel conditions and power amplifier ratings to achieve target transmit or received power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas transmit CDD signals simultaneously, then transmission diversity is improved, but interference between antennas increases
Solution Approach 1:
The patent applies local quality by assigning different cyclic delay values to different antennas based on their individual channel conditions. Each antenna transmits CDD signals with locally optimized delay parameters, allowing the system to achieve diversity gain while minimizing interference through localized adaptation to each antenna's transmission environment.
2Reliability
If equal power is distributed across all antennas, then device complexity is reduced, but transmission quality is suboptimal
Solution Approach 1:
The patent changes the power distribution parameters dynamically based on channel quality measurements. Instead of fixed equal power allocation, the system adjusts power levels across antennas according to their respective channel conditions, achieving optimal transmission quality while maintaining manageable complexity through systematic parameter adaptation.
3Reliability
If cyclic delay is applied to all antennas, then frequency diversity is improved, but spectral flatness deteriorates
Solution Approach 1:
The patent applies different cyclic delay values to different antennas based on their channel characteristics. This local differentiation allows the system to achieve frequency diversity gain while maintaining spectral flatness by optimizing delay parameters for each antenna's specific transmission path rather than applying uniform delay across all antennas.
Data Source
AI summary
Methods and apparatus of allocating antennas for cyclic delay diversity (CDD) transmission are disclosed. One method includes estimating a transmission channel of a transceiver having a plurality of antennas. A subset of a plurality of transceiver antennas is selected based on the estimated transmission channel. A single transceiver antenna of the subset is identified based on a channel quality of a transmission path of the single transceiver antenna. Cyclic delay diversity (CDD) signals are transmitted from the subset of the plurality of antennas, wherein a minimally delayed CDD signal is transmitted from the identified single transceiver antenna of the subset of the plurality of transceiver antennas.