Adaptive Bit Allocation for Dual-Polarized Antenna Feedback
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Solution Overview
Problem
In multi-antenna communication systems, particularly with eight dual-polarized antennas, the existing feedback mechanisms for pre-coding matrix indices and phase offsets are inefficient, leading to suboptimal feedback accuracy and throughput due to the need for precise and frequent feedback of multiple index components.
Innovation Solution
A method and device that adaptively adjust the number of bits assigned to phase offset and instantaneous pre-coding matrix indices based on the distance between long-term pre-coding matrices, allowing for more efficient bit allocation and improved feedback accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of bits for phase offset and instantaneous pre-coding matrix indices is fixed, then the feedback structure is simple, but the feedback accuracy and throughput are suboptimal
Solution Approach 1:
The patent applies dynamics by making the bit allocation for phase offset and instantaneous pre-coding matrix indices adaptive rather than fixed. The system dynamically adjusts the number of bits allocated to different feedback components based on the distance between long-term pre-coding matrices, allowing the feedback structure to adapt to varying channel conditions and optimize both accuracy and efficiency.
Solution Approach 2:
The patent changes the parameter of bit allocation from a fixed value to a variable that depends on the distance between long-term pre-coding matrices. By computing this distance and adjusting the bit allocation accordingly, the system optimizes feedback accuracy for different channel scenarios while managing feedback overhead efficiently.
2Measurement precision
If more bits are allocated for phase offset and instantaneous pre-coding matrix indices, then feedback accuracy improves, but feedback overhead increases
Solution Approach 1:
The patent optimizes the parameter of bit allocation by making it conditional on the distance between long-term pre-coding matrices. When this distance is small, fewer bits are allocated for instantaneous indices; when the distance is large, more bits are allocated. This dynamic parameter adjustment reduces unnecessary feedback overhead while maintaining adequate feedback accuracy.
Solution Approach 2:
The patent applies partial action by allocating bits selectively based on channel conditions. Instead of always allocating maximum bits for highest accuracy, the system allocates just enough bits based on the computed distance metric, avoiding excessive feedback overhead when high precision is not necessary.
3Productivity
If fixed bit allocation is used for feedback, then implementation is simple, but system throughput is limited
Solution Approach 1:
The patent enhances system throughput by implementing dynamic bit allocation that adapts to channel conditions. The base station computes the distance between long-term pre-coding matrices and adjusts bit allocation accordingly, allowing the system to optimize throughput for different scenarios rather than being constrained by fixed allocation.
Solution Approach 2:
The patent uses feedback mechanisms where the terminal computes the distance metric and the base station adjusts bit allocation based on this feedback. This closed-loop feedback system enables the system to learn from channel conditions and optimize throughput through adaptive resource allocation.
Data Source
AI summary
There is provided a method and device for feeding back a pre-coding matrix index of a dual-polarized antenna which has a first antenna array and a second antenna array and is arranged at a base station to which the index of a first pre-coding matrix for the first antenna array, the index of a second pre-coding matrix for the second antenna array and the phase offset between the first pre-coding matrix and the second pre-coding matrix are fed back from a terminal, comprising: computing a distance between the first pre-coding matrix and the second pre-coding matrix; judging whether the distance is larger than a predetermined threshold or not; and assigning less bits to indicate the phase offset if the distance is larger than the predetermined threshold. The method and device according to the present disclosure can effectively advance the feedback accuracy of a system thus improving the bit error rate and throughput of the system.