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IEEE Communications Letters

Issue 6 • Nov. 1997

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Displaying Results 1 - 8 of 8
  • Data transmission when the sampling frequency exceeds the Nyquist rate

    Publication Year: 1997, Page(s):157 - 159
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    We show that if a channel with a total spectral support of W Hz is sampled at a rate f/sub s/>2W Hz (exceeding the Nyquist condition), it is possible to find integers M, N such that only a certain subset, consisting of M members of the N integers, carries independent data which obey M/N/spl les/2W/f/sub s/. Not all integers M, N satisfying this inequality will work, and even for a working set of M... View full abstract»

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  • Impact of PCS handoff response time

    Publication Year: 1997, Page(s):160 - 162
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (83 KB)

    In a personal communications services (PCS) network, the network delay for a handoff request is limited by a timeout period. If the network fails to respond within the timeout period, the handoff call is forced terminated. We study the effect of the network response time on the performance (the call incompletion probability) of a PCS network. Our study indicates that at a small offered load, the n... View full abstract»

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  • A two-stage hybrid approach for CCI/ISI reduction with space-time processing

    Publication Year: 1997, Page(s):163 - 165
    Cited by:  Papers (44)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    We present a hybrid approach for separate cochannel interference (CCI) reduction and intersymbol interference (ISI) equalization in a slow Rayleigh fading channel. In this hybrid approach, a space-time filter is designed to maximize signal-to-interference-plus-noise ratio (SINR) by jointly optimizing the weight vector and the modified channel vector. A Viterbi equalizer then follows to equalize IS... View full abstract»

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  • Transmission energy allocation with low peak-to-average ratio

    Publication Year: 1997, Page(s):166 - 168
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    Transmission energy allocation (TEA) to bits according to their sensitivity is known to significantly enhance robustness to channel errors. These advantages are gained at the cost of high peak-to-average ratio (PAR) of the signal energy employed to transmit different bits. We show that, in the case of 4-QAM, appropriate grouping of bits allows achieving all the gains of optimal TEA while maintaini... View full abstract»

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  • Bit-interleaved coded modulation with iterative decoding

    Publication Year: 1997, Page(s):169 - 171
    Cited by:  Papers (196)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    A simple iterative decoding technique using hard-decision feedback is presented for bit-interleaved coded modulation (BICM). With an 8-state, rate-2/3 convolutional code, and 8-PSK modulation, the improvement over the conventional BICM scheme exceeds 1 dB for a fully-interleaved Rayleigh flat-fading channel and exceeds 1.5 dB for a channel with additive white Gaussian noise. This robust performanc... View full abstract»

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  • The estimation of signaling delay in ATM networks

    Publication Year: 1997, Page(s):172 - 174
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    In multimedia applications over ATM networks, more stringent quality of services are required, because these applications are especially sensitive to the time delay. In this letter, a simple estimation of signaling delay is presented using Erlang service models according to ITU-T "Q.2931". Additionally, the call blocking probability of a realistic network is considered. The simulation results show... View full abstract»

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  • Analysis of DQLT scheduling policy for an ATM multiplexer

    Publication Year: 1997, Page(s):175 - 177
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (99 KB)

    This letter suggests a modified priority scheduling policy for the asynchronous transfer mode (ATM) multiplexer, which is called DQLT. In the dual queue length threshold (DQLT) method, there exist two queues: (1) Q/sub 1/ is for nonreal-time traffic and (2) Q/sub 2/ is for real-time traffic and each queue has its own threshold to adaptively control the buffer congestion. If Q/sub 1/ is congested o... View full abstract»

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  • 1997 Index IEEE Communications Letters Vol. 1

    Publication Year: 1997, Page(s):178 - 185
    Request permission for commercial reuse | PDF file iconPDF (300 KB)
    Freely Available from IEEE

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IEEE Communications Letters publishes letters on the frontiers of research within the field of interest of the IEEE Communications Society in a timely manner.

 

 

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Editor-in-Chief
Octavia Dobre
Memorial University, Canada