IEE Proceedings - Communications
Volume 144, Issue 5, October 1997
Volumes & issues:
Volume 144, Issue 5
October 1997
-
- Author(s): M.K. Loze ; B.K. Middleton ; A. Ryley
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 289 –294
- DOI: 10.1049/ip-com:19971522
- Type: Article
- + Show details - Hide details
-
p.
289
–294
(6)
A simple model is developed for the recording performance of a complete digital magnetic recording system using peak detection and an instrumentation tape recorder operating in the low/mid speed range of its capabilities. Results obtained using this model are compared with a wide variety of experimental data. Studies are made of channel and equaliser output pulses and also probability of error as a function of record current amplitude, packing density and replay equaliser parameters. Predictions are found to be of acceptable accuracy and justify the use of this type of modelling as a tool in recording system design. - Author(s): Z. Fan and P. Mars
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 295 –300
- DOI: 10.1049/ip-com:19971408
- Type: Article
- + Show details - Hide details
-
p.
295
–300
(6)
The authors propose a new approach to the problem of congestion control arising at the user network interface (UNI) of ATM-based broadband networks. The access flow control mechanism operates on the principle of feedback control. It uses a finite impulse response (FIR) neural network to accurately predict the traffic arrival patterns. The predicted output in conjunction with the current queue information of the buffer can be used as a measure of congestion. When the congestion level is reached, a control signal is generated to throttle the input arrival rate. The FIR multilayer perceptron model and its training algorithm are discussed. Simulation results presented in the paper suggest that the scheme provides a simple and efficient traffic management for ATM networks. - Author(s): H. Lee and Y. Nemoto
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 301 –306
- DOI: 10.1049/ip-com:19971409
- Type: Article
- + Show details - Hide details
-
p.
301
–306
(6)
The authors present a new approach to evaluating the loss periods in the output multiplexer of ATM switch. First, they present a model for the output multiplexer using a discrete time finite capacity queueing system model with a threshold in the queue and priority in the bursty incoming cells. In modelling the loss period, they divide the queue space into a nonloss region, a half-loss region and a full-loss region, and define their corresponding time periods as the nonloss period, half-loss period and full-loss period, respectively. Next, they derive a general formula for the mean sojourn time for which a queue stays in a region. They derive formulae for the loss period, cell loss rate due to buffer overflow, discard rate for low priority cell and cell waiting time. Finally, they present the results of numerical experiments. - Author(s): C.H. Ng ; L. Bai ; B.H. Soong
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 307 –310
- DOI: 10.1049/ip-com:19971509
- Type: Article
- + Show details - Hide details
-
p.
307
–310
(4)
The Markov-modulated Bernoulli process (MMBP) is widely used in modelling traffic sources. The authors propose a so-called high-low (H/L) model, a two-state Markov chain, to characterise multimedia traffic on ATM-based broadband networks. The H/L model has two nonzero-valued states corresponding to the high-activity and the low-activity level of multimedia traffic. The queue-length distribution of an ATM switch fed with N identical MMBP sources was derived using a probability generating function coupled with a matrix geometric approach. By decomposing matrices into their spectral representation forms the queue length can be evaluated by considering the roots of its characteristic function. Numerical results for the case of two MMBPs are also presented. - Author(s): M.H. Lee ; Y.S. Mun ; B.G. Kim
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 311 –315
- DOI: 10.1049/ip-com:19971508
- Type: Article
- + Show details - Hide details
-
p.
311
–315
(5)
The authors propose a new mechanism to handle delay and loss requirements of ATM traffic simultaneously. It is designed to satisfy the different levels of cell-loss performance for two classes of heterogeneous nonreal-time ATM traffics as well as the delay and loss requirements of real-time traffics simultaneously. The cell arrivals of input streams are modelled by MMPP. Both a real-time buffer and a nonreal-time buffer are served by a common server. The buffer occupancies of each traffic are controlled by the partial buffer sharing scheme. The steady-state probabilities of queue-length distributions are obtained using the stochastic integral approach. - Author(s): J.-G. Zhang
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 316 –321
- DOI: 10.1049/ip-com:19971454
- Type: Article
- + Show details - Hide details
-
p.
316
–321
(6)
In code-division multiple-access (CDMA) systems using all-optical signal processing, the optical multiple-access interference (OMAI) degrades the system performance and can ultimately limit the number of active users. To reduce the effect of OMAI, error-correction codes are used in both asynchronous and synchronous fibre-optic CDMA systems. It is shown that the use of asymmetric error-correction binary block codes can not only effectively reduce the bit-error rate, but also increase the maximum number of active users in a constant-bandwidth network more efficiently than using symmetric error-correction binary block codes. Therefore, this permits implementation of a cost-effective fibre-optic CDMA network. - Author(s): J.J. Shi and J.P. Fonseka
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 322 –330
- DOI: 10.1049/ip-com:19971507
- Type: Article
- + Show details - Hide details
-
p.
322
–330
(9)
The analysis and design of mesh restorable and self-healing ring networks is considered. A general class of traffic-based survivability measures to analyse telecommunications networks is proposed. These measures calculate the average traffic-carrying capability of a network over all possible failure states. Traffic-based survivability measures are proposed to analyse mesh networks with and without restoration scheme. For the design of mesh restorable networks the network configuration and working capacity assignment are combined to minimise the cost before restoration is added into the network. Path restoration in spare capacity assignment is considered. A joint approach that combines configuration, working and spare capacity assignments altogether is addressed. A new architecture is proposed called the dual-homing hierarchical self-healing ring (DH-HSHR) architecture to interconnect self-healing rings. A heuristic algorithm for single-homing HSHRs is modified to find near optimum DH-HSHR configurations. Numerical results are given and the two restoration strategies, mesh and ring, compared in terms of survivability and cost. - Author(s): F.L. Lo ; T.S. Ng ; T.I. Yuk
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 331 –335
- DOI: 10.1049/ip-com:19971523
- Type: Article
- + Show details - Hide details
-
p.
331
–335
(5)
When many stations need to communicate with a central server, the simplest way to allow them to transmit messages to the server is to use a non-centralised contention access protocol. One of the most efficient of these protocols is channel sense multiple access with collision detection (CSMA/CD). Exact analyses of single-channel CSMA/CD networks have been done, but, so far, all the analyses of multichannel CSMA/CD networks in the literature have used approximations to simplify the process of finding the transition matrix. The paper presents an exact Markov analysis of a multichannel CSMA/CD network. It is shown that such a multichannel system performs better than an equivalent network having just one channel. - Author(s): H.M. Alkussayer ; Y.J. Guo ; S.K. Barton
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 336 –340
- DOI: 10.1049/ip-com:19971246
- Type: Article
- + Show details - Hide details
-
p.
336
–340
(5)
A novel multiuser detector for asynchronous code division multiple access (CDMA) system is presented. Using a new type of spreading sequences and shortened correlators with linear combining, an unbiased one-shot suboptimum detection is achieved without increasing the receiver complexity. Two decorrelating algorithms, the direct and the recursive methods, are given for the proposed detector configuration. Theoretical and simulation results show that the receiver performs well in severe near–far environments. - Author(s): J.P. Aldis ; A.H. Kemp ; S.K. Barton
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 341 –348
- DOI: 10.1049/ip-com:19971503
- Type: Article
- + Show details - Hide details
-
p.
341
–348
(8)
A CDMA mobile radio demonstration system has been created by a joint industry/university project in the UK. The paper describes the engineering of the reverse link (from mobile to base station). The link hardware is described. The main features of interest are the power control mechanism and the all-digital rake receiver. Results presented illustrate the BER performance over a multipath channel simulator and the power control mechanism performance. - Author(s): D.W. Bennett ; P.B. Kenington ; R.J. Wilkinson
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 349 –356
- DOI: 10.1049/ip-com:19971502
- Type: Article
- + Show details - Hide details
-
p.
349
–356
(8)
The feasibility of reducing the peak power rating of a multichannel amplifier by limiting the peak-to-mean ratio of its input signal is examined in terms of the resulting intermodulation distortion levels. A number of current modulation schemes are examined and the effects of limiting are highlighted in each case. In addition, both ideal and practical limiter characteristics are assessed and the differences illustrated. These results indicate that a controlled amount of limiting is permissible in many cases, while still ensuring that the overall system specifications are met. This leads to considerable benefits in terms of power and cost savings in the design of a base station or satellite transmitter. - Author(s): S.M. Brunt ; M. Darnell ; M. Grayson
- Source: IEE Proceedings - Communications, Volume 144, Issue 5, p. 357 –360
- DOI: 10.1049/ip-com:19971501
- Type: Article
- + Show details - Hide details
-
p.
357
–360
(4)
The first-order phase-locked loop is a standard feedback device commonly used to provide both carrier and clock synchronisation in digital transmission systems. At low signal-to-noise ratios increased jitter on the timing estimates results in a raised probability of symbol error and an increased likelihood of synchroniser symbol slips; in the latter case, symbols are either deleted from or inserted into the received data stream. The paper re-examines the full transient modulo-2π and nonmodulo-2π phase error process and demonstrates that the probability of cycle-slipping with time can be expressed in terms of the loop cycle-slipping frequency as determined from a previous stationary analysis of the loop.
Computer model for analysing digital magnetic recording systems
Access flow control scheme for ATM networks using neural-network-based traffic prediction
Loss periods in ATM output multiplexer
Modelling multimedia traffic over ATM using MMBP
Performance analysis of delay-loss priority mechanism using Markov modulated arrival stream
Performance improvement of fibre-optic code-division multiple-access systems by using error-correction codes
Analysis and design of survivable telecommunications networks
Markov analysis of multichannel star-connected network with channel sensing and collision detection
New multiuser detector for asynchronous CDMA
Engineering of a CDMA radio uplink for a mobile radio demonstration system
Distortion effects of multicarrier envelope limiting
Cycle-slipping probability of first-order phase-locked loop using transient analysis
Most viewed content for this Journal
Article
content/journals/ip-com
Journal
5
Most cited content for this Journal
We currently have no most cited data available for this content.