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Modulation Scheme Analysis for Low-Power Leadless Pacemaker Synchronization Based on Conductive Intracardiac
IEEE Transactions on Biomedical Circuits and Systems
|May 27, 2022
Summary
Conductive intracardiac communication (CIC) enables leadless cardiac pacemaker synchronization. This study shows On-Off-Keying (OOK) and baseband Manchester (BB-MAN) achieve reliable synchronization at low power, making them ideal for pacemaker development.
Area of Science:
- Biomedical Engineering
- Medical Devices
- Signal Processing
Background:
- Leadless cardiac pacemakers (LLPMs) require efficient synchronization.
- Conductive intracardiac communication (CIC) is a promising synchronization method.
- Existing research lacks detailed analysis of optimal CIC parameters for LLPMs.
Purpose of the Study:
- To analyze the intracardiac communication performance of On-Off-Keying (OOK) and baseband Manchester (BB-MAN) modulation techniques.
- To determine optimal communication parameters for CIC-based LLPM synchronization within a 2-5 μW power budget.
- To evaluate the feasibility of reliable CIC-based LLPM synchronization under realistic conditions.
Main Methods:
- Simulated and in-vitro experiments on porcine hearts were conducted.
- Bit error rate (BER) was measured for OOK and BB-MAN modulation schemes.
- Performance was analyzed as a function of transmitted bit-energy and data rates (75-500 kbps).
Main Results:
- A BER of 1e-4 was achieved with median bit-energy of 3-16 pJ.
- Both OOK and BB-MAN demonstrated comparable performance.
- BB-MAN showed a slight bit-energy advantage (1-2 dB) at higher data rates.
Conclusions:
- Reliable CIC-based LLPM synchronization is feasible at transmitted power levels as low as 10 nW.
- OOK and BB-MAN are preferable to other modulation techniques due to hardware and bandwidth efficiency.
- Baseband communication approaches may be favored over OOK for improved efficiency and reduced complexity.
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