UWB Frame Synchronization via Integrated Channel Estimation

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Solution Overview

Problem

Current wireless personal area networks using ultra wide band (UWB) radio technology lack specifications for fine synchronization between independent data devices within a super-frame structure, particularly in UWB radio technology, which affects communication efficiency due to unknown propagation time and relative position of devices.

Innovation Solution

A method for simultaneous channel estimation and frame synchronization using a second training sequence within the super-frame structure, where the channel estimation algorithm performs both tasks, allowing for efficient synchronization without the need for a separate frame synchronization algorithm at the beginning of each frame, utilizing digital correlation and coherent integration for accurate signal processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate synchronization and channel estimation algorithms are used, then synchronization accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidalgorithm complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines frame synchronization and channel estimation into a single integrated algorithm that processes the training sequence simultaneously for both functions. The correlation-based approach performs frame synchronization by detecting the training sequence position while concurrently estimating channel impulse response coefficients, eliminating the need for separate processing algorithms and reducing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The training sequence serves multiple purposes: it enables both frame synchronization and channel estimation simultaneously. The same received signal portion is used to determine frame boundaries and to characterize the channel, making the system more efficient by extracting multiple pieces of information from a single signal source rather than requiring separate sequences for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If a shared training sequence is used for both synchronization and channel estimation, then device complexity is reduced, but measurement precision may deteriorate

Engineering Contradiction:

Improvealgorithm complexityVSAvoidsynchronization accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The received signal is segmented into distinct portions: the training sequence portion used for synchronization and channel estimation, and the data portion for actual communication. Within the training sequence, the algorithm identifies specific correlation peaks to determine frame synchronization points, while using the same segment to calculate channel impulse response coefficients through correlation processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The algorithm uses feedback mechanisms where the detected correlation peaks from the training sequence provide information about frame timing, which then informs the channel estimation process. The channel impulse response derived from the same training sequence is fed back to refine the synchronization accuracy, creating an iterative improvement loop that maintains precision while using a single training sequence.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach ensures reliable and efficient synchronization between independent data devices in UWB wireless personal area networks, improving communication accuracy and reducing the complexity of synchronization processes, even in multipath channels and varying propagation delays.

Implementation Method 1

employing digital correlation techniques like coherent integration

Methodology Applied

Scientific EffectDigital correlation:

Implementation Method 2

employing digital correlation techniques like coherent integration

Methodology Applied

Scientific EffectCoherent integration:

Data Source

PatentUS7542486B2Method of processing an incident pulsed UWB signal received by an independent data device of a wireless data communication system of the WPAN type, and corresponding independent data device

Publication Date: 2009.06.02 STMICROELECTRONICS INT NV

AI summary

A method for processing an incident pulsed signal of an ultra wide band type received over a channel by a data device operating in a wireless data communications system is provided. The incident pulsed signal carries information within a super-frame structure. Upon reception of each super-frame structure by a data device, coarse synchronization is performed with another data device acting as a coordinator device for the wireless data communications system. The coarse synchronization uses a first training sequence. Upon reception of each frame allocated to the data device operating within the super-frame structure, channel estimation is performed using a second training sequence. The channel estimation also performs a frame synchronization.