Differential pulse-position modulation for power-efficient optical communication

Abstract

Abstract-In this paper, we examine the use of differential pulse-position modulation (DPPM) for optical communication systems using intensity modulation with direct detection in the presence of additive white Gaussian noise. We present expressions for the error probability and power spectral density of DPPM. We show that for a given bandwidth, DPPM requires significantly less average power than pulse-position modulation (PPM). We also examine the performance of DPPM in the presence of multipath intersymbol interference (ISI). We find that the ISI penalties incurred by PPM and DPPM exhibit very similar dependencies upon the channel rms delay spread. We discuss the use of chiprate and multichip-rate equalization to combat ISI. Finally, we describe potential problems caused by the nonuniform bit-rate characteristic of DPPM, and we propose several solutions.

Suitable Combination of Direct Intensity Modulation and Spreading Sequence for LIDAR with Pulse Coding

“…In DPPM, an M -bit input block maps to one of L=2M unique DPPM symbols, including L−1 empty slots and a pulse [40,41,42,44,45,46]. The DPPM symbol is derived from the corresponding PPM symbol by removing all empty slots following the pulse, thus reducing the average symbol length and increasing bandwidth efficiency.…”

“…The disadvantage of DPTM is that it requires symbol synchronization and, therefore, more circuitry and complexity than other approaches, which are outside of the scope of this paper. Table 1 and Table 2 [31,40,41,42,43,44,45,46,47,50,51] summarize the characteristics of M -bit input blocks when they are converted into symbols by OOK, PPM, DPPM, MPPM, DPIM, and DH-PIM, where Rs is the time slot rate and N0 is the energy of noise. In the case of optical communication, the influence of path loss can be ignored.…”

Adaptive differential amplitude pulse‐position modulation technique for optical wireless communication channels based on fuzzy logic

“…There are several different modulation schemes for optical wireless systems. The common modulation schemes are on-off key (OOK), PPM, PAM, differential PPM (DPPM), digital pulse-interval modulation (DPIM) and DAPPM [9][10][11][12][13][14]. The modulation technique named adaptive differential amplitude pulse-position modulation (DAPPM) is proposed in this paper, which combined the DPPM and PAM as shown in Fig.…”

Reading lamp-based visible light communication system for in-flight entertainment

“…In this work, CR-DPPM (Constant Rate DPPM) is considered because of its simplicity and low cost of implementation, which is only based on an edge detector and a counter. This scheme does not only offer the advantages of DPPM (which encodes the data by modifying the distance between the pulses) [7][8], but also allows a constant bit rate, which makes the implementation of multimedia applications easier. In addition, it is suitable to be used simultaneously in communications and illumination systems due to the absence of light flickering.…”