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This paper describes a new approach for locating signals, such as promoter sequences, in nucleic acid sequences. Transcription factor (TF) binding to its DNA target site is a fundamental regulatory interaction. The most common model used to represent TF binding specificities is a position weight matrix (PWM), which assumes independence between binding positions. However, in many cases, this simplifying...
This paper proposes a low-complexity equalizer for orthogonal frequency division multiplexing (OFDM) systems under time-varying frequency-selective fading environments. The equalization uses suboptimum maximum likelihood sequence estimation (MLSE) in cooperation with semi-blind linear prediction (SBLP) in the estimation of the channel frequency responses. When the number of pilot subcarriers is far...
Multiple input multiple output (MIMO) space time codes are used to increase the diversity or the number of degrees of freedom for improving the capacity (data rate) and reliability (error rate) of wireless communication over fading channels. In this paper, we propose a new structure of space time code designed for non-stationary constant-amplitude modulation formats using polynomial phase signals...
Gene and regulatory sequence identification is the first step in the functional annotation of any genome. Identification and annotation of such elements in the genome is a fundamental challenge in genomics and computational biology. Since regulatory elements are often short and variable, their identification and discovery using computational algorithms is difficult. However, significant advances have...
Processing of biomolecular sequences using communication theory techniques provides powerful approaches for solving highly relevant problems in bioinformatics by properly mapping character strings into numerical sequences. We provide an optimized procedure for predicting protein-coding regions in DNA sequences based on the period-3 property of coding region. We present a digital correlating and filtering...
Orthogonal frequency division multiplexing (OFDM) is a technique that provides high data rate communications, but it is sensitive to the carrier frequency offset (CFO) caused by the misalignment in carrier frequencies between transmitter and receiver, which results in Inter-Carrier Interference (ICI) among the sub-carriers and degrades the Carrier-to-Interference Ratio (CIR). In this paper, we propose...
Orthogonal frequency division multiplexing (OFDM) has become one of the promising technologies for the next-generation communication systems to support high-data-rate transmission. However, conventional OFDM systems are sensitive to both the carrier frequency offset (CFO) and the in-phase and quadrature (IQ) imbalance, which cause the inter-carrier interference (ICI) and greatly degrade the performance...
Orthogonal frequency division multiplexing (OFDM) has become one of the promising technologies for the next-generation communications systems to support high-speed high-quality digital transmission and reception. However, the frequency misalignment between transmitter and receiver results in the inter-carrier interference (ICI), which degrades the performance. In this paper, we propose to apply On-Off-Keying...
A new digital phase modulation format is proposed which uses polynomial functions of time to phase modulate a sinusoidal carrier. Information bits from the source are mapped to the coefficients of the polynomial. The receiver decodes information by estimating the coefficients of the polynomial and mapping the estimates back to the corresponding bits. A transmitter and receiver structure for the polynomial...
The Internet Protocol Television (IPTV) service is becoming more and more popular among telecommunications companies because it can deliver TV programs anytime anywhere. Based on IP protocol, IPTV features advantages like bandwidth efficiency and ease of management. IPTV supports both broadcast and unicast services like LiveTV and VideoOnDemand. WiMAX wireless system, capable of ensuring high bandwidths...
Modern wireless communication systems require an efficient use of the spectrum. Here we introduce the use of permutation codes (PC) as a combined source coding and channel modulation system using M-ary phase shift keying as the modulation formats. We combine the features of a permutation code vector quantizer and a permutation code as channel modulator. For source coding the permutation code is a...
The paper analyses the sensitivity of the receiver of an optical PPM system, considering both wrong-slot error and false-alarm error. Coded optical PPM systems with direct and heterodyne detection are analysed. The performances of Reed-Solomon codes with different code rates are considered. Relations between bit-error probability P/sub b/ and the optimum efficiency rho for the uncoded and coded systems...
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