MIMO Antenna Phase Co-phasing Under Power Constraints
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Solution Overview
Problem
MIMO systems with per-antenna transmitting power constraints face performance degradation when using SVD-based methods to determine the phase of transmitting antennas, which affects spatial diversity gain and signal transmission efficiency.
Innovation Solution
A method to determine the phase of each transmitting antenna in a MIMO system by calculating values based on groups of channel gains between antennas, allowing for adjustment of data signal phases to enhance spatial diversity and signal reception, using co-phasing techniques such as global, pairwise, cumulative, and iterative methods to maximize the equivalent channel gain and improve signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SVD-based methods are used to determine the phase of transmitting antennas, then spatial diversity gain is improved, but per-antenna transmitting power constraints cause performance degradation
Solution Approach 1:
The patent changes the parameter used for phase determination from SVD-based eigenvalues to correlation-based metrics. Specifically, it calculates correlation values between channel vectors of different transmitting antennas and uses these correlation values to determine optimal phase shifts, thereby adapting to power constraints while maintaining spatial diversity gain
Solution Approach 2:
The patent segments the phase determination process into multiple steps: first calculating channel correlation values between antenna pairs, then determining phase shifts based on these correlations, and finally applying these phase shifts to the transmitted signals. This segmented approach allows optimization under power constraints
2Reliability
If phase adjustment is optimized to maximize spatial diversity, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the system automatically calculates channel correlation values and determines optimal phase shifts without requiring external intervention or complex centralized control. Each transmitting antenna independently adjusts its phase based on pre-calculated correlation values from the receiver feedback
Solution Approach 2:
The patent performs preliminary calculation of channel correlation values and optimal phase shifts before actual signal transmission. The receiver pre-computes correlation metrics and sends feedback to transmitters, allowing transmitters to apply phase adjustments without real-time complex computations during transmission
Data Source
AI summary
A method for determining a phase of each of a plurality of transmitting antennas in a multiple input and multiple output (MIMO) communication system includes: calculating, for first and second ones of the plurality of transmitting antennas, a value based on first and second groups of channel gains, the first group including channel gains between the first transmitting antenna and each of a plurality of receiving antennas, the second group including channel gains between the second transmitting antenna and each of the plurality of receiving antennas; and determining the phase of each of the plurality of transmitting antennas based on at least the value.