Shared Fourier Transform Resource Allocation for GNSS and OFDM Terminals

Solution Overview

Problem

Mobile terminals with limited computation power and high power consumption face challenges in efficiently processing satellite positioning signals and OFDM-based wireless communication due to the computational complexity of fast Fourier transforms, particularly in implementing GNSS and OFDM techniques simultaneously.

Innovation Solution

A priority management system is implemented in mobile terminals to allocate resources for direct and inverse Fourier transform computations between satellite positioning and OFDM wireless communication, ensuring that positioning signal processing is delayed if OFDM is in use, and prioritizing OFDM processing when necessary, thereby optimizing resource usage and reducing computational load.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If dedicated computation devices are implemented for both GNSS and OFDM processing, then processing capability is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improveprocessing capabilityVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a shared computation device that can perform both fast Fourier transforms for OFDM wireless communication and correlation computations for GNSS signal processing. This single multi-functional device replaces what would traditionally require separate dedicated processors, thereby reducing device complexity and power consumption while maintaining the processing capability for both functions simultaneously or in alternating modes

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If dedicated computation devices are implemented for both GNSS and OFDM processing, then processing capability is improved, but power consumption increases

Engineering Contradiction:

Improveprocessing capabilityVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent implements a shared computation device that can perform both fast Fourier transforms for OFDM wireless communication and correlation computations for GNSS signal processing. This single multi-functional device replaces what would traditionally require separate dedicated processors, thereby reducing device complexity and power consumption while maintaining the processing capability for both functions simultaneously or in alternating modes

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If correlation computation is performed for satellite signal acquisition, then positioning accuracy is improved, but computational load increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidcomputational load

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the correlation computation functionality into a shared computation device that also performs OFDM processing. By combining these functions in a single device capable of performing fast Fourier transforms, the patent reduces overall computational load and device complexity while maintaining the necessary correlation computation capability for accurate satellite signal acquisition and positioning

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7515102B2GPS.WIFI terminal

Publication Date: 2009.04.07 WSOU INVESTMENTS LLC

AI summary

A terminal, in particular a mobile terminal, comprises means for processing a positioning signal coming from a satellite positioning system, means for computing direct and inverse Fourier transforms, wireless communication means using OFDM modulation, and priority management means for assigning resources of the direct/inverse Fourier transform computation means either to the positioning signal processing means or to the wireless communication means.