Relay Transmission Filter Design for MIMO Power Constraint Compliance
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Solution Overview
Problem
Conventional MMSE based MIMO cooperative relaying systems do not effectively consider power constraints of individual antennas, leading to inefficiencies in relay transmission techniques.
Innovation Solution
A method to determine a transmission filter for a relay system by setting a power constraint condition based on the maximum eigenvalue of the transmission covariance matrix, using the maximum transmission power at each antenna, and calculating the filter using channel information between the relay and the receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MMSE based MIMO cooperative relaying systems are used, then data transmission is achieved, but power constraint of respective antennas is not considered leading to inefficiency
Solution Approach 1:
The patent transforms the power constraint formulation from a simple total power constraint to an eigenvalue-based constraint. By changing the parameter representation of power constraints (from scalar total power to matrix eigenvalues), the system achieves both individual antenna power compliance and optimized transmission efficiency through the derived filter equation.
2Device complexity
If total maximum transmission power constraint is applied, then relay transmission is simplified, but individual antenna power constraints are violated
Solution Approach 1:
The patent segments the overall power constraint into individual antenna-specific constraints through eigenvalue decomposition. Instead of applying a single total power constraint, the method decomposes the constraint into separate eigenvalue constraints for each antenna, ensuring individual compliance while maintaining system-wide optimization.
3Loss of time
If closed-form relay transmitting technique is used, then establishment expense and communication delay are reduced, but filter determination complexity may increase
Solution Approach 1:
The patent performs preliminary eigenvalue decomposition and filter determination before actual data transmission. By pre-calculating the optimal filter based on channel state information and power constraints, the system avoids complex real-time calculations during transmission, thereby reducing communication delay while maintaining computational tractability.
Data Source
AI summary
A method of determining a filter of a relay and the relay for performing the same are disclosed. The method of determining a filter of a relay to minimize data estimation error in a relay environment considering a direct link includes (a) setting a power constraint condition of the relay so that maximum value of eigenvalue of a transmission covariance matrix of the relay is less than maximum transmission power usable at respective antenna; and (b) determining a transmission filter of the relay using the maximum transmission power usable at respective antenna according to the set power constraint condition.