—This paper compares the mean acquisition time (MAT) performance of two serial search acquisition schemes over frequency-selective multipath Rayleigh fading channels. Both the conventional cell-by-cell detection and the novel joint two-cell detection are characterized. In contrast to the majority of published results considering only one correct timing… (More)
– Luby Transform codes (LT) were originally designed for the Binary Erasure Channel (BEC) encountered owing to randomly dropped packets in the statistical multiplexing aided classic wireline-based Internet, where transmitted packets are not affected by the fading or noise of the propagation environment of the wireless Internet. For the sake of transmitting… (More)
—We propose a generic algorithm for the construction of efficient reversible variable-length codes (RVLCs) and variable-length error-correcting (VLEC) codes, which optimizes the code-word length distribution. The algorithm may be applied to any existing codeword selection mechanism, and it is capable of generating codes of higher efficiency in comparison to… (More)
—Ultra-wideband (UWB) systems having a bandwidth on the order of gigahertz have recently received wide attention both in the U.S. and in Europe. The family of UWB systems may communicate either by generating ultra-wideband signals or with the aid of innovatively combining conventional narrowband, wideband, or broadband signals. At the time of writing, UWB… (More)
—In this contribution, adaptive rate transmissions are investigated in the context of direct-sequence code-division multiple access (DS-CDMA) systems using variable spreading factors (VSFs). In the context of the recently established family of adap-tive rate-transmission schemes, the transmission rate is typically adapted in response to the channel's… (More)
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract— Design of high-efficiency low-complexity detection schemes for ultrawide bandwidth (UWB) systems is highly challenging. This contribution proposes a reduced-rank adaptive multiuser… (More)
– Joint video-coding, channel-coding and modulation schemes based on a Constant Bit Rate (CBR) video codec, Variable Length Codes (VLCs) as well as Trellis Coded Modulation (TCM) and Turbo TCM (TTCM) schemes are proposed. These arrangements have a latency of a single video frame duration. A significant coding gain is achieved without bandwidth expansion… (More)
—A general recursive algorithm for the efficient and accurate computation of the bit error rate (BER) of square-shaped-QAM constellations over additive white Gaussian noise (AWGN) channels is derived. We take advantage of the relationship amongst different square-shaped-QAM constellations using Gray coded bit mapping.