Topic
Pulse-position modulation
About: Pulse-position modulation is a research topic. Over the lifetime, 3916 publications have been published within this topic receiving 72057 citations. The topic is also known as: PPM.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: It is shown that in most cases, the jam suppression of UWB is superior to that of DS-SS, and this analysis extends to more practical UWB waveforms such as Gaussian and Rayleigh monocycles.
Abstract: We analyze the performance of ultra-wideband (UWB) communications in the presence of interference. Closed-form expressions are provided for the jam resistance of UWB with binary pulse position modulation utilizing rectangular pulses. A simple approximation is obtained for the special case of tone interference. The jam resistance analysis is extended to more practical UWB waveforms such as Gaussian and Rayleigh monocycles. A comparison between the interference suppression capabilities of UWB and direct-sequence spread-spectrum (DS-SS) is carried out under conditions similar to both systems. It is shown that in most cases, the jam suppression of UWB is superior to that of DS-SS.
219 citations
••
07 Oct 2001TL;DR: To increase the data rate for future wireless systems, a novel scheme using multiple transmit antennas for space digital modulation is proposed, termed space shift keying (SSK).
Abstract: To increase the data rate for future wireless systems, a novel scheme using multiple transmit antennas for space digital modulation is proposed. In the scheme of space modulation, more than two antennas are employed to transmit and signal the information bits. The novel space modulation scheme is termed space shift keying (SSK). Numerical results are presented to examine the reception performance.
218 citations
••
TL;DR: A numerical example is given that shows that impulse radio modulation is theoretically able to provide multiple-access communications with a combined transmission capacity of hundreds of megabits per second at bit error rates in the range 10/sup -4/ to 10/Sup -7/ using receivers of moderate complexity.
Abstract: Wireless spread spectrum multiple access (SSMA) using time hopping and block waveform encoded (M-ary) pulse position modulated (PPM) signals is analyzed. For different M-ary PPM signal designs, the multiple-access performance in free-space propagation renditions is analyzed in terms of the number of users supported by the system for a given bit error rate, signal-to-noise ratio, bit transmission rate, and number of signals in the M-ary set. The processing gain and number of simultaneous users are described in terms of system parameters. Tradeoffs between performance and receiver complexity are discussed. Upper bounds on both the maximum number of users and the total combined bit transmission rate are investigated. This analysis is applied to ultrawideband impulse radio modulation. In this modulation, the communications waveforms are practically realized using subnanosecond impulse technology. A numerical example is given that shows that impulse radio modulation is theoretically able to provide multiple-access communications with a combined transmission capacity of hundreds of megabits per second at bit error rates in the range 10/sup -4/ to 10/sup -7/ using receivers of moderate complexity.
214 citations
••
18 Sep 2011TL;DR: In this article, the effect of in-band crosstalk on several advanced optical modulation formats, including QPSK, 16-QAM, and 64 QAM, was quantified through simulations and experiments.
Abstract: We quantify, through simulations and experiments at 21.4 GBaud, the effect of in-band crosstalk on several advanced optical modulation formats, showing a 1-dB penalty at a bit-error ratio of 1×10−3 from a crosstalk of −18 dB, −24 dB, and −32 dB for QPSK, 16-QAM, and 64-QAM, respectively.
210 citations