WCDMA Link Supportability Computation via Spectral Overlap
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Solution Overview
Problem
Wideband Code Division Multiple Access (WCDMA) communication systems face challenges in assessing communication link supportability due to multiple access interference (MAI) from overlapping communication beams, which complicates the computation of link supportability and resource allocation in satellite communications systems like the Mobile User Objective System (MUOS).
Innovation Solution
The method computes communication link supportability by calculating carrier-to-noise spectral density, adjusting for uplink path gains and spectral overlap, and applying reduced dimension spectral overlap values to determine transponder input power, using a set of matrices to assess multiple access interference and ensure adequate communication resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple communication beams are used to support more users, then system capacity and coverage are improved, but multiple access interference increases and computation complexity increases
Solution Approach 1:
The patent segments the complex computation of link supportability into separate components: calculating spectral overlap values for different beam pairs, computing interference metrics for individual links, and aggregating results. This modular approach breaks down the overall computation into manageable segments that can be processed independently and combined, reducing the complexity burden of handling multiple communication beams simultaneously.
Solution Approach 2:
The patent transforms the link supportability assessment by changing the computational parameters from direct signal-to-interference ratio calculations to spectral overlap-based metrics. By using spectral overlap values as intermediate parameters, the system can efficiently evaluate interference effects without directly computing complex multi-beam interference patterns, thereby reducing computation complexity while maintaining accuracy.
2Measurement precision
If spectral overlap computation is performed for all beam pairs, then interference assessment accuracy is improved, but computation time increases
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing spectral overlap values for all beam pairs before the actual link supportability assessment. These pre-computed spectral overlap values serve as lookup tables that can be quickly referenced during interference assessment, eliminating the need to re-compute spectral overlaps for each assessment and significantly reducing computation time while maintaining full accuracy.
Data Source
AI summary
A method, computer program product, and system are provided for computing link supportability in a WCDMA communications system. For example, the method can be used to calculate link supportability of a transponder in satellite communications system (e.g. MUOS) in a user-to-base direction. This method can include expressing a carrier signal to noise ratio spectral density for a communication link of interest in terms of a transponder input power of the communication link of interest, a spectral overlap factor representative of one or more interfering communication links, and a transponder input power of the one or more interfering communication links. Assumptions and approximations can be made to simplify the spectral density expression in order to reduce a dimensionality of terms used in the computation of the expression. As such, in reducing dimensionality, the expression becomes a manageable computation for WCDMA communication systems to evaluate.