Joint Synchronization and Modulation for Energy-Efficient Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In energy-efficient networks, the energy overhead of conventional methods for achieving tight synchronization between transmitter and receiver clocks becomes significant, particularly due to the use of pilot signals and differential signal modulation, which can reduce energy efficiency.
Innovation Solution
A transmitter configured to generate pulses with determined start time, width, and height based on the range of possible relative drifts between the transmitter and receiver clocks, ensuring non-overlapping reception and equal signal energy consumption, while a receiver uses a matched filter bank to decode these pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot signals are used to perform synchronization, then synchronization accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent combines synchronization and data transmission into a single process. Data bits are differentially modulated to directly convey synchronization information, eliminating the need for separate pilot signals. This merging of functions maintains synchronization accuracy while removing the additional energy overhead of dedicated pilot signal transmission and processing.
Solution Approach 2:
The patent extracts the synchronization function from separate pilot signals and embeds it within the data transmission itself through differential modulation. By taking out the redundant synchronization component and integrating it into the data stream, the system achieves synchronization without the energy-consuming separate pilot signal infrastructure.
2Loss of energy
If data bits are modulated differentially to enable synchronization, then pilot signal transmission is eliminated, but signaling constraints reduce energy efficiency
Solution Approach 1:
The patent employs dynamic pulse width modulation where the width of each pulse varies according to the data bit value and synchronization requirements. This dynamic approach allows the system to adapt pulse characteristics in real-time, achieving both synchronization and data transmission without rigid signaling constraints, thereby maintaining energy efficiency while handling clock drift and jitter.
3Reliability
If clocks are resynchronized frequently to maintain accuracy, then synchronization reliability is improved, but energy consumption and communication overhead increase
Solution Approach 1:
The patent incorporates synchronization information in advance within the differential modulation scheme of data bits. By preliminarily embedding synchronization capabilities into the data transmission structure itself, the system maintains continuous synchronization reliability without requiring frequent separate resynchronization actions, thus avoiding the energy overhead associated with repeated synchronization cycles.
Data Source
AI summary
A system including a transmitter and a receiver that are loosely synchronized, the transmitter encodes signal waveforms having a start time, a width and a height that are determined based on a range of possible relative drifts of a receiver clock with respect to a transmitter clock and the receiver decodes the waveforms based on a sequence of tests, chosen to account for any uncertainty that may arise due to the lack of tight synchronization.