A multiuser demodulation algorithm for the uplink of an asynchronous multicarrier code division multiple access (MC-CDMA) based wireless communication system is derived. The estimation of the multipath channel parameters and the symbol detection are incorporated in a joint demodulation scheme which employs a space-alternating generalized expectation-maximization (SAGE) algorithm for the iterati...

The paper presents an empirical model of emphatic word detection, as an alternative to conventional machine-learning-based methods. The model is based on the Probabilistic Amplitude Demodulation (PAD) that is iteratively applied for getting syllable and stress modulations, i.e., using the cascaded PAD method. The emphatic words are detected by prominent peaks of the stress modulation and by con...

We consider a signaling format where information is modulated via a superposition of independent data streams. Each data stream is formed by error-correction encoding, constellation mapping, replication and permutation of symbols, and application of signature sequences. The relations between data bits and the modulation symbols transmitted over the channel can be represented in the form of a sp...

This paper designs an underwater acoustic communication system based on tamed spread spectrum and Frequency Hopping Multiple Access (FHMA) for multiple underwater vehicles. In this system, multiple underwater vehicles can communicate with the console on the water surface simultaneously successfully. The communication system is composed of tamed spread spectrum modulation and demodulation, frequ...

This paper aims at designing a selective demodulation scheme based on Log-likelihood Ratio threshold (SDLT) instead of the conventional adaptive demodulation (ADM) scheme, by using rateless codes. The major difference is that the Log-likelihood ratio (LLR) threshold is identified as a key factor to control the demodulation rate, while the ADM uses decision region set (DRS) to adjust the bit rat...

A receiver structure suitable for coded M-ary DPSK signals on static and time-varying channels is investigated. The transmitter consists of a convolutional code, an interleaver, and a diierential encoder, and hence represents a type of \serial turbo code". In the receiver, the kernel is an a posteriori probability (APP) demodulator. A priori information is accepted and reliability outputs are p...

A simple method to demodulate the resolver signal is introduced in this article. The proposed method can provide the demodulated resolver quadrature signals, sine and cosine, without requiring the resolver excitation signal as the carrier signal. Therefore, the phase delay between the stator winding and the rotor winding is avoided. The configuration of this approach consists of commercial avar...

In recent years, physical layer security (PLS), which utilizes the inherent randomness of wireless signals to perform encryption at layer, has attracted attention. We propose chaos modulation as a PLS technique. addition, method for using special encoder polar codes been proposed (PLS-polar), in can be easily achieved by encrypting frozen bits code. Previously, we chaos-modulated code transmiss...

This paper proposes a new method for parameter estimation of distorted single phase signals, through an improved demodulation-based phase tracking incorporated with a frequency adaptation mechanism. The simulation results demonstrate the superiority of the proposed method compared to the conventional SOGI (Second-Order Generalized Integrator)-based approach, in spite of the dc-offset and harmon...

In this paper, we consider the demodulation and equalization problem of differential Impulse Radio (IR) UltraWideBand (UWB) Systems with Inter-Symbol-Interference (ISI). The differential IR UWB systems have been extensively discussed recently [2], [4], [7], [9], [10], [17], [20]. The advantage of differential IR UWB systems include simple receiver frontend structure. One challenge in the demodu...