—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)
promising downlink transmission scheme. This scheme is capable of supporting ubiquitous communications over diverse communication environments without BER performance degradation.
– 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)
— A novel sequential estimation method is proposed for the initial synchronization of pseudonoise (PN) signals derived from m-sequences. This sequential estimation method is designed based on the principle of iterative soft-in-soft-out (SISO) decoding , and hence we refer to it as the Recursive Soft Sequential Estimation (RSSE) acquisition scheme. The RSSE… (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)
In this contribution nonlinear coding theory is invoked in order to study redundant residue number system (RRNS) based channel codes. We analyse some unsolved problems of RRNS codes, exploring their weight-distribution, distance-distribution and coding performance. The conventional algorithms used for error-detection and error-correction in RRNS codes are… (More)