Works (13)

Updated: August 16th, 2024 13:37

2011 journal article

Near-Far Resistant Synchronization for UWB Communications

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 10(2), 519–529.

By: L. Li* & K. Townsend n

author keywords: UWB; near-far problem; coarse acquisition; dimension detection
TL;DR: Simulation results are provided that show the improved performance of the near-far resistant synchronization procedure proposed in this paper for up to two high-power and four equal-power interfering users when compared to the best alternative from the literature. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2010 journal article

M-ary PPM for Transmitted Reference Ultra-Wideband Communications

IEEE TRANSACTIONS ON COMMUNICATIONS, 58(7), 1912–1917.

By: L. Li n & J. Townsend n

author keywords: Ultra-wideband; M-ary PPM; transmitted reference; multiple-access interference; chip discrimination
TL;DR: A new method for deriving the variance of the Gaussian random variable resulting from multiple-access interference (MAI) is developed using the power delay profile (PDP) of the channel. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2008 article

Multiple-Access Performance of Transmitted Reference UWB Communications with M-ary PPM

GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE.

By: L. Li n, J. Townsend n & R. Ulman*

TL;DR: To increase the data rate for transmitted reference (TR) ultra-wideband (UWB) systems, M-ary pulse position modulation (PPM) is used in this paper and a new method to derive the variance of the Gaussian random variable resulted from multiple-access interference (MAI) is developed using the power delay profile (PDP) of the channel. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2008 article

Transmitted Reference Ultra-Wideband Communications with M-ary PPM

GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE.

By: L. Li n, J. Townsend n & R. Ulman*

TL;DR: Analysis and numerical results show that TR UWB systems with M-ary PPM using chip discrimination is robust against high-power interfering users in wireless networks where centralized power control is infeasible, such as ad-hoc networks. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2005 article

Threshold discrimination and blanking for large near-far power ratios in UWB networks

Lovelace, W. M., & Townsend, J. K. (2005, September). IEEE TRANSACTIONS ON COMMUNICATIONS, Vol. 53, pp. 1447–1450.

By: W. Lovelace n & J. Townsend n

author keywords: impulse radio (IR); interference; networks; ultrawideband (UWB) radio
TL;DR: It is found that even a small number of very near interferers can greatly reduce the performance of a system without blanking or discrimination, and a statistical model is developed that predicts bit-error performance for binary offset pulse position modulation as a function of near-far density and power for varying discrimination thresholds. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2002 journal article

Efficient simulation of rare jitter probabilities in atm switches

TR (Center for Advanced Computing and Communication), (4).

By: A. Akyamac n & J. Townsend*

TL;DR: A novel importance sampling simulation methodology is presented to estimate the 1-Point CDV for CBR sources in the presence of background VBR traffic and it is observed from experimental results that the improvement in simulation efficiency is inversely proportional to the probability being estimated. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

2002 journal article

The effects of timing jitter and tracking on the performance of impulse radio

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, 20(9), 1646–1651.

By: W. Lovelace* & J. Townsend*

author keywords: impulse radio (IR); medium access control (MAC) layer; network; timing jitter; tracking; ultra-wideband (UWB) radio; wireless
TL;DR: The performance of IR is very sensitive to timing jitter and tracking, at least in part due to the very narrow pulses, and orthogonal 4-ary pulse position modulation out performs binary offset PPM at all jitter levels in thermal and pulse noise. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

1999 journal article

Efficient simulation of QoS in ATM switches using connection traffic descriptors

Performance Evaluation, 38(2), 105–132.

By: A. Akyamac n, J. Freebersyser* & J. Townsend n

TL;DR: The efficient simulation methods developed here are suitable for the design and testing of the switches and connection admission control algorithms planned for use in ATM networks, and develop importance sampling techniques to increase the efficiency of the simulation for ATM networks with heterogeneous input traffic classes. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

1999 conference paper

Rare event simulation of delay in packet switching networks using DPR-based splitting

1999 Winter Simulation Conference: proceedings: Pointe Hilton Squaw Peak Resort, Phoenix, AZ, U.S.A., 5-8 December 1999, 1, 402–410.

By: Z. Haraszti* & J. Townsend n

Source: NC State University Libraries
Added: August 6, 2018

1998 journal article

Simulation of rare events in communications networks

IEEE COMMUNICATIONS MAGAZINE, 36(8), 36–41.

By: J. Townsend n, Z. Haraszti*, J. Freebersyser* & M. Devetsikiotis*

TL;DR: An overview of importance sampling techniques and how they can be used to provide orders of magnitude speedup for many network problems is provided. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

1997 article

A stochastic importance sampling methodology for the efficient simulation of adaptive systems in frequency nonselective Rayleigh fading channels

AlQaq, W. A., & Townsend, J. K. (1997, May). IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, Vol. 15, pp. 614–625.

By: W. AlQaq* & J. Townsend n

author keywords: adaptive systems; importance sampling; Rayleigh fading; stochastic optimization; wireless communications
TL;DR: An IS stochastic technique for the efficient simulation of adaptive systems which employ diversity in the presence of frequency nonselective slow Rayleigh fading and additive, white, Gaussian noise is presented. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

1997 journal article

Guest editorial: Computer-aided modeling, analysis, and design of communication links

IEEE Journal on Selected Areas in Communications, 15(4), 593–596.

By: K. Benletaief, E. Biglieri, T. Rappaport, J. Townsend & T. P.

Source: NC State University Libraries
Added: August 6, 2018

1997 journal article

Performance of local power control in peer-to-peer impulse radio networks with bursty traffic

TR (Center for Advanced Computing and Communication), (5).

By: S. Kolenchery, J. Townsend & G. Bilbro

Source: NC State University Libraries
Added: August 6, 2018

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