Iterative TxBF Steering Weight Computation for Wireless Systems
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Solution Overview
Problem
Existing multi-stream communications systems face inefficiencies in increasing signal-to-noise ratio (SNR) and signal-to-interference ratio (SIR) due to computationally intensive mechanisms that drain battery power and hinder device miniaturization.
Innovation Solution
A method for determining steering weights using iterative techniques based on channel weights, allowing for efficient beam-forming transmission with multiple antennas, thereby improving SNR and SIR without excessive computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional SVD-based beam-forming mechanisms are used to increase SNR and SIR, then signal quality is improved, but computational complexity increases and battery power is drained
Solution Approach 1:
The patent changes the computational parameters from full SVD decomposition to iterative eigenvalue-based methods with controlled iteration counts. By adjusting the number of iterations and using approximate channel state information, the system achieves acceptable beam-forming performance with significantly reduced computational complexity and power consumption.
Solution Approach 2:
The patent applies partial action by using only a subset of the full SVD computation - specifically, computing only the dominant eigenvalues and eigenvectors through iterative methods rather than complete decomposition. This partial computation provides sufficient beam-forming capability for practical scenarios while avoiding the full computational burden.
2Reliability
If traditional SVD-based beam-forming mechanisms are used to increase SNR and SIR, then signal quality is improved, but device miniaturization is hindered
Solution Approach 1:
The patent reduces the computational parameters required for beam-forming by using iterative methods that converge to sufficient accuracy with fewer operations. This reduction in computational requirements translates to smaller processor units and less memory, enabling device miniaturization while maintaining acceptable signal quality.
Solution Approach 2:
The patent uses partial SVD computation by calculating only the necessary dominant components through iteration rather than complete decomposition. This partial action reduces the hardware footprint required for implementation, facilitating smaller device dimensions.
3Reliability
If traditional SVD-based beam-forming mechanisms are used to increase SNR and SIR, then signal quality is improved, but device cost increases
Solution Approach 1:
The patent modifies the computational parameters to use iterative algorithms with controlled precision rather than exact SVD. This approach allows implementation on lower-cost processors and reduces requirements for high-speed memory and complex arithmetic units, thereby reducing manufacturing costs while maintaining sufficient signal quality.
4Device complexity
If iterative techniques are used to determine steering weights, then computational complexity is reduced, but computation time may increase
Solution Approach 1:
The patent uses periodic iteration with a predetermined maximum number of iterations to compute steering weights. By limiting the iteration count to a practical threshold, the system achieves a balance between computational simplicity and response time, avoiding both excessive complexity and unacceptably long computation times.
Data Source
AI summary
Systems and methods are provided for directing radiated energy from a transmitting device towards a receiving device using multiple antennas. Channel weights, representing signal attenuation and a phase rotation induced by a transmission medium, are determined at a transmitting device. A set of steering weights are determined based on applying an iterative linear transform to an initial value of the steering weights, where the linear transform depends on the determined channel weights. A final value of the steering weights is applied to an input signal to produce a transmit signal, and the transmit signal is transmitted using multiple antennas.