Multi-Receiver Timing Alignment for Shorter FIR Signal Synthesis
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Solution Overview
Problem
In underwater acoustic communication systems with multiple wave receivers, the large delay time differences between receivers necessitate long FIR filters, leading to increased computational load and reduced convergence speed, while shortening the filter length degrades bit error rate performance.
Innovation Solution
A receiver configuration that includes detection units to estimate arrival times, timing adjustment units to align these times with a reference, and FIR filters to synthesize signals, thereby reducing the number of taps required and improving convergence speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the FIR filter tap length is increased to compensate for large delay time differences between wave receivers, then the BER performance is improved, but the operational complexity and convergence speed deteriorate
Solution Approach 1:
The patent applies preliminary action by performing delay compensation before the FIR filtering operation. The timing adjustment unit aligns the arrival times of signals from multiple wave receivers using detected arrival time information, so that signals arrive at the FIR filter with minimized time differences. This preliminary timing alignment allows the FIR filter to use a shorter tap length while still achieving good BER performance, thereby reducing operational complexity and improving convergence speed without sacrificing reliability
2Reliability
If the FIR filter tap length is increased to compensate for large delay time differences between wave receivers, then the BER performance is improved, but the convergence speed decreases
Solution Approach 1:
The timing adjustment unit performs preliminary delay compensation by aligning signal arrival times from multiple wave receivers before they enter the FIR filter. This pre-alignment reduces the effective delay spread that the FIR filter must handle, enabling the use of shorter tap lengths. Shorter tap lengths directly improve convergence speed of adaptive algorithms while maintaining BER performance through the preliminary timing synchronization
3Device complexity
If the FIR filter tap length is shortened to reduce operational complexity, then the convergence speed is improved, but the BER performance deteriorates
Solution Approach 1:
The patent uses preliminary timing adjustment to compensate for delay differences before the signal enters the FIR filter. By detecting arrival times at each wave receiver and adjusting the timing of received signals using stored offset values, the system ensures that signals from multiple receivers are synchronized. This preliminary synchronization allows the FIR filter to operate with shorter tap lengths without losing BER performance, thus reducing operational complexity while maintaining reliability
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 allows for signal synthesis with a shorter FIR filter length without deteriorating bit error rate performance, reducing computational load and enhancing adaptive algorithm convergence.
Implementation Method 1
The wave receivers 110-1 to 110-n convert the received sound waves into electric signals and output the electric signals to the FIR filters 120-1 to 120-n
Data Source
AI summary
A receiver including a plurality of wave receivers that receive signals arriving from a predetermined direction, a plurality of detection units that is connected to at least some of the plurality of wave receivers and detect arrival times of signals received by a connected wave receivers, and a plurality of adjustment units that adjust a deviation between arrival times of the plurality of wave receivers based on arrival times or arrival directions of the plurality of detected signals.