MIMO Detection Using Tracking Reference Signals for Phase Correction
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Solution Overview
Problem
Current MIMO detection methods in wireless communication systems, such as zero-forcing (ZF) and minimum mean square error (MMSE), require computationally rigorous calculations and do not effectively correct for phase shifts, leading to inefficiencies in resource utilization and detection accuracy.
Innovation Solution
The proposed method involves calculating a pseudo-inverse of the channel estimation matrix once per subframe and using tracking reference signals to correct for phase shifts, allowing for reduced complexity in MIMO detection by separating phase shift correction from channel detection, thereby reducing computational demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional MIMO detection methods (ZF, MMSE) are used to perform data detection for each OFDM symbol, then detection accuracy is maintained, but computational complexity and resource consumption increase significantly
Solution Approach 1:
The patent segments the MIMO detection process into two distinct parts: (1) channel estimation using demodulation reference signals, and (2) phase shift correction using tracking reference signals. This segmentation allows the computationally intensive channel estimation to be performed once per subframe, while the simpler phase correction is applied to each OFDM symbol, thereby reducing overall computational complexity while maintaining detection accuracy
Solution Approach 2:
The patent performs preliminary channel estimation using demodulation reference signals at the beginning of each subframe, before actual data detection. This preliminary action establishes a baseline channel model that can be reused across multiple OFDM symbols within the subframe, avoiding redundant calculations and reducing computational burden during subsequent detection operations
2Measurement precision
If conventional MIMO detection methods are used for each OFDM symbol, then detection performance is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent extracts the phase shift component from the overall channel estimation problem. By using tracking reference signals specifically dedicated to phase tracking, the method separates phase correction from magnitude estimation, allowing more efficient resource utilization since phase correction requires significantly fewer computational resources than full channel estimation
3Device complexity
If conventional methods do not correct for phase shifts, then computational complexity is reduced, but detection accuracy deteriorates
Solution Approach 1:
The patent introduces tracking reference signals as an intermediary mechanism specifically dedicated to phase shift estimation. These specialized reference signals enable accurate phase tracking without requiring full channel estimation, thus improving detection accuracy in the presence of phase shifts while keeping computational complexity manageable through the use of a dedicated, simplified tracking mechanism
Data Source
AI summary
What is disclosed is a method for wireless communication comprising receiving a wireless communication via a receiver of the mobile communication device, deriving a demodulation reference signal from a first plurality of symbols of the wireless communication; creating a channel estimation matrix using the demodulation reference signal; inverting the channel estimation matrix to obtain a channel pseudo-inverse matrix; deriving a tracking reference signal from a second plurality of symbols of the wireless communication; calculating a phase shift for one or more additional symbols based on the tracking reference signal; determining a corrected channel pseudo-inverse matrix for the one or more additional symbols by adjusting the channel pseudo-inverse matrix according to the calculated phase shift; and controlling the receiver to accomplish data detection using the corrected channel pseudo-inverse matrix on one or more orthogonal frequency division multiplexing subcarriers.