MIMO Power Allocation Controller for Error Performance
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Solution Overview
Problem
The error performance of multiple input multiple output (MIMO) systems using block Tomlinson-Harashima precoder (BTHP) mechanisms is degraded compared to block diagonalization methods, particularly in multiple-user environments, where existing solutions like Tomlinson Harashima precoder (THP) and block diagonalization face challenges in balancing channel capacity loss and system complexity.
Innovation Solution
A transmitting apparatus and method that incorporates a precoder for nonlinear data processing, a power allocation controller to ensure equal minimum distances for receiving users, and a channel decomposition filter to decompose channels into a triangular form, optimizing power allocation to improve error performance across all users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If block diagonalization mechanism is used to remove inter-user interference, then error performance is improved, but channel capacity loss increases as the number of users increases
Solution Approach 1:
The patent changes the parameter of channel decomposition from block diagonalization to triangular decomposition (QR decomposition), which fundamentally alters how the MIMO channel is factorized. This parameter change allows the system to achieve good error performance through the triangular structure while avoiding the severe channel capacity loss associated with block diagonalization, as the triangular decomposition preserves more of the original channel characteristics.
Solution Approach 2:
The patent segments the MIMO channel into multiple independent subchannels through QR decomposition, creating a triangular structure where each user experiences an independent effective channel. This segmentation allows for simplified receiver processing and good error performance while maintaining better channel capacity utilization compared to block diagonalization approaches.
2Loss of energy
If Tomlinson Harashima precoder (THP) mechanism is used to remove inter-user interference, then channel capacity loss is reduced, but system complexity increases
Solution Approach 1:
The patent extracts the interference cancellation function from the complex THP structure and implements it separately at the receiver side through the QR decomposition-based detection mechanism. This extraction removes the need for complex non-linear precoding at the transmitter, significantly reducing system complexity while maintaining the channel capacity benefits of interference cancellation.
Solution Approach 2:
The patent introduces QR decomposition as an intermediary mechanism that bridges the gap between simple linear processing and complex non-linear THP processing. The QR decomposition provides a structured factorization of the channel matrix that enables efficient interference management with much lower complexity than full THP implementation.
3Ease of manufacture
If block diagonalization mechanism is used, then implementation simplicity is improved, but error performance degrades compared to optimized BTHP mechanisms
Solution Approach 1:
The patent employs dynamic power allocation that adapts to the specific channel conditions and user requirements. The power allocation controller dynamically adjusts the power distribution across users and subchannels based on real-time channel state information, enabling the system to achieve optimal error performance that adapts to varying network conditions while maintaining implementation simplicity.
Solution Approach 2:
The patent changes the fundamental parameter of channel decomposition from block diagonalization to triangular decomposition, which provides a better balance between implementation simplicity and error performance. The triangular structure from QR decomposition naturally provides a hierarchical processing approach that is simpler to implement than optimized BTHP while achieving superior error performance through better interference management.
Data Source
AI summary
Provided are a transmitting apparatus and a transmitting method in a multiple input multiple output system. A power allocation controller includes a block Tomlinson-Harashima precoder (BTHP) that precodes and outputs data to be transmitted to each user in a nonlinear scheme. The BTHP removes and outputs inference signals from data for each user based on the channel information that is fed back from the users. The data for each user output from the BTHP are allocated with power by the power allocation controller. The power allocation controller calculates power allocation parameters so that receiving minimum distances at receiving ends for each user that receive data through the MIMO antennas are the same, and allocates the calculated parameters to data for each user.