Recent work on Direct-Sequence (DS) Code Division Multiple Access (CDMA) has shown that blind adaptive interference suppression techniques can be used for reliable demodulation, provided that the timing of the desired signal is known. The blind demodulator has since been used as a building block for a scheme for joint timing acquisition and demodulation. In this paper, we consider a blind adapt...

Both the Radio Frequency Identification (RFID) and Wireless Fidelity (WiFi) are popular and ubiquitous technologies. However, RFID is lagging behind due to vendor specific solutions and excessive reader cost. A WiFi compatible IEEE 802.11 RFID tag can eliminate the reader. A digital modulator and demodulator for the reader-less RFID tag in IEEE 802.11 protocol employing Direct Sequence Spread S...

Multiple-symbol differential detection is known to fill the gap between conventional differential detection of PSK ( -DPSK) and coherent detection of -PSK with differential encoding ( -DEPSK). Emphasis has been so far on soft-input/hard-output detectors applied in uncoded systems. In this paper, we investigate a receiver structure suitable for coded DPSK signals on static and time-varying chann...

Developments in vector quantization based joint source-channel coding have produced codes which efficiently and reliably transmit data signals over noisy channels. Further advancements through soft-decision decoding have shown improvements in signal-to-distortion ratio (SDR) over hard-decoding. We present a q-bit soft decision demodulator for the vector quantization of Gaussian and Gauss-Markov...

It is well known that spatial phase shifting interferometry (SPSI) may be used to demodulate two-dimensional (2D) spatial-carrier interferograms. In these cases the application of SPSI is straightforward because the modulating phase is a monotonic increasing function of space. However, this is not true when we apply SPSI to demodulate a single-image interferogram containing closed fringes. This...

This paper investigated the performance of Mary DPSK on Rayleigh Channel on the basis of Bit Error Rate (BER). BER is calculated by using simulation of system model consisting of source, modulator, channel and demodulator on MATLAB platform.

Chaotic modulation is a useful technique for spread spectrum communication. In this paper, an on-line adaptive chaotic demodulator based on a radial-basis-function (RBF) neural network is proposed and designed. The demodulator is implemented by an on-line adaptive learning algorithm, which takes advantage of the good approximation capability of the RBF network and the tracking ability of the ex...