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IEEE Communications Letters

Issue 10 • Date Oct. 2000

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Displaying Results 1 - 8 of 8
  • MRC performance for M-ary modulation in arbitrarily correlated Nakagami fading channels

    Publication Year: 2000, Page(s):301 - 303
    Cited by:  Papers (73)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    We derive the symbol error probability for coherent detection of several types of M-ary modulation schemes using maximal ratio combining. We consider Nakagami fading channels, where the instantaneous signal-to-noise ratios of the diversity branches are not necessarily independent or identically distributed. The proposed problem is made analytically tractable by transforming the correlated physical... View full abstract»

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  • A recursive algorithm for the error probability evaluation of M-QAM

    Publication Year: 2000, Page(s):304 - 306
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    A general recursive algorithm for the efficient and accurate computation of the bit error rate (BER) of square-shaped M-QAM constellations over additive white Gaussian noise (AWGN) channels is derived. We take advantage of the relationship amongst different square-shaped M-QAM constellations using Gray coded bit mapping. View full abstract»

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  • Exact conditions for the symmetry of a loop

    Publication Year: 2000, Page(s):307 - 309
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    It is well known that a loop looks the same from both ends provided that its topology is approximately symmetrical with respect to the midpoint of the line. However, to the best of the author's knowledge, no explicit proof has ever been given to confirm or refute this property. In this article, it is mathematically proved for the first time that a telephone line, regardless of its topology, is alw... View full abstract»

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  • Flat fading approximation error

    Publication Year: 2000, Page(s):310 - 311
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (45 KB)

    Flat fading approximation assumes that the system bandwidth is small compared to the coherence bandwidth. An upper bound is derived for an approximation to the error involved in flat fading approximation thereby giving us a measure of the degradation. The bound is found to vary as the square of the system bandwidth to coherence bandwidth ratio. View full abstract»

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  • Time-variant distortions in OFDM

    Publication Year: 2000, Page(s):312 - 314
    Cited by:  Papers (53)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    We analyze the degradation of orthogonal frequency division multiplexing (OFDM) signals from time-variant distortions like carrier and sampling frequency offset, Doppler spread and oscillator phase noise. We propose a novel analytical framework in the discrete-time domain based on the FFT demodulation of a single OFDM symbol and unify previous methods with some new results. Exact definitions of th... View full abstract»

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  • Stabilized precoder for indoor radio communications

    Publication Year: 2000, Page(s):315 - 317
    Cited by:  Papers (3)  |  Patents (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    A low complexity, stabilized precoder for broadband indoor radio is presented, which uses radial root reduction for stability, and so avoids the use of a module operator. Simulations show that the stabilized precoder has comparable performance to Tomlinson-Harashima (1971) precoding with perfect automatic gain control (AGC), and is immune to AGC fluctuations which degrade the performance of TH pre... View full abstract»

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  • Forward error correction of FSK alphabets for noncoherent transmissions over AWGN channel

    Publication Year: 2000, Page(s):318 - 320
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    We show that several coding schemes, in particular turbo encoding, dramatically improve the performance of a noncoherently detected frequency shift-keying modulation with correlated signals. The proposed a posteriori probability (APP) decoder based on bit-by-bit decisions proves to be highly flexible and more efficient than a classical block decisions decoding scheme. Moreover, the choice of the F... View full abstract»

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  • Efficient rank-ordered mean (ROM) techniques for the recovery of isolated losses in highly corrupted images

    Publication Year: 2000, Page(s):321 - 322
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (41 KB)

    This paper proposes two efficient rank-ordered mean (ROM)-based techniques to conceal isolated losses in any image. The first technique is an iterative ROM-based technique while the second one is a modified version of ROM filtering. Both techniques have better performances than the SD-ROM technique especially for high loss percentages. View full abstract»

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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