Multi-pulse Position Modulation Scheme Research Articles

Spectral Analysis of (Multi-) Pulse-Position Modulation

Nowadays, laser communication has received great achievements owing to its advantages, e.g., large channel capacity, easy miniaturization of communication system and strong anti-interference ability in different conditions. Pulse position modulation (PPM), as an important modulation technology in laser communication system that transmit signal with lower power, is attracting much attention. However, the performance of the modulation scheme highly depends on the bandwidth of transmission. To remedy this defect of PPM, the multipulse position modulation (MPPM) scheme is proposed to increase the accuracy and bandwidth limit. This modulation scheme has stronger anti-interference ability than PPM. Therefore, there has been rising interest in studying the characteristics of the multi-PPM. In this article, we developed an appropriate mathematical model to represent a PPM transmission, analyzed the spectrum of the transmission and characterized the bandwidth of this transmission. Compared with benchmarks of MPPM scheme, its performance has been discussed. According to the analysis, MPPM strongly increases band-utilization efficiency, however PPM has a better bit error rate (BER) performance than MPPM.

Performance evaluation on correlation detection and energy detection for ultra wideband‐impulse radio communication with multi‐pulse position modulation scheme in implant body area networks

Ultra wideband-impulse radio (UWB-IR) transmission, which can provide high data rate for real-time transmission and low-power consumption in transceivers, is one of promising transmission technologies in implant body area networks (BANs). Some studies on UWB-IR propagation characteristics in implant BANs have reported that UWB-IR signals suffer from large attenuation in human body channels. It is therefore necessary to clarify the actual performance of UWB-IR modulation and demodulation methods in implant BANs. In this study, the authors focus on experimental evaluation of the correlation detection and energy detection for UWB-IR transmission with multi-pulse position modulation (MPPM). For this purpose, the authors develop a UWB-IR communication system with MPPM scheme, and experimentally evaluate the transmission performance of the developed systems with the two detection methods. In addition to the experimental evaluation, the authors also theoretically analyse the bit-error rate (BER) performance of the correlation detection and energy detection methods by using Gaussian approximation. From the experimental results, the developed system has achieved a BER of 10 -2 at the propagation loss of 75 dB with a data rate of 2 Mbps in the correlation detection. This result shows the feasibility of reliable UWB-IR communication in actual implant BANs.