This paper proposes a novel VLSI architecture for the demodulator for processing satellite data communication. The overall receiver algorithm is divided into two parts: one to be implemented on an FPGA and the other on a DSP processor. A new distributed arithmetic based architecture for implementing a Sampling Rate Converter is also proposed. The main advantage of this architecture is that it d...

In this thesis, a number of coded Gaussian minimum-shift keying (GMSK) transceiver systems using the Laurent representation and iterative decoding are proposcd and evaluated. First, a Cstate reduced-complexity linear demodulator is shown to perfom close to the optimal 16-state demodulator for BT=0.3. This reduced-complexity receiver is used with a coded GMSK system, and a mode1 for considering ...

We present a full image reconstruction methodology in frequency-domain photoacoustic (PA) microscopy using low-cost I/Q demodulator for the recording of amplitude and phase signals. By modulating intensity continuous-wave diode laser at 10 MHz, we have been able to provide accurate optical absorption images surface reconstructions phantom samples, comparing also extracted results with standard ...

In this report we propose a sensor architecture and a corresponding read-out technique on silicon for the detection of dynamic capacitance change. This approach can be applied to rapid particle counting and single particle sensing in a fluidic system. The sensing principle is based on capacitance variation of an interdigitated electrode (IDE) structure embedded in an oscillator circuit. The cap...

Two key operations required of a receiver in a direct-sequence (DS) code division multiple access (CDMA) system are the timing acquisition of transmissions that are starting up or have lost synchronization, and the demodulation of transmissions that have been acquired. The reliability of both these operations is limited by multiple-access interference, especially for conventional matched filter...

We determine the bit-error rate (BER) of multilevel quadrature amplitude modulation (M-QAM) in flat Rayleigh fading with imperfect channel estimates. Despite its high spectral efficiency, M-QAM is not commonly used over fading channels because of the channel amplitude and phase variation. Since the decision regions of the demodulator depend on the channel fading, estimation error of the channel...

A noncoherent two-way relaying system is developed using physical-layer network coding for improved throughput over conventional relaying in a fading channel. Energyefficient noncoherent operation is achieved using multitone frequency shift keying (FSK). A novel soft-output demodulator is developed for the relay, and corresponding achievable exchange rates are found for Rayleigh fading and AWGN...

This paper presents a new signal demodulator for ultra-high frequency (UHF) radio identification (RFID) tag chips. The is used to demodulate amplitude shift keying (ASK) modulated signals with the advantages of high noise immunity, large input range and low power consumption. consists charge pump, an envelope detector, comparator. In particular, provides hysteresis comparator through two detect...