An approach to the performance analyses of signal-to-interference (SIR) based selection combining (SC) operating over the correlated Rayleigh fading channels experiencing an arbitrary number of correlated multiple, co-channel interferers is presented. General analysis of multibranch SC where each correlated branch experiences an arbitrary number of multiple correlated co-channel interferers. In...

An efficient mixed-mode Gaussian frequency-shift keying (GFSK) demodulator with a frequency offset cancellation circuit is presented. The structure is suitable for a low-IF Bluetooth receiver and can also be applied to other receivers involving continuous phase shift keying (CPSK) signals. The demodulator implementation is robust to tolerate process variations without requiring calibration. It ...

Orthogonal frequency-division multiplexing (OFDM) modulation is a promising technique for achieving the high bit rates required for a wireless multimedia service. Without channel estimation and tracking, OFDM systems have to use differential phase-shift keying (DPSK), which has a 3-dB signalto-noise ratio (SNR) loss compared with coherent phase-shift keying (PSK). To improve the performance of ...

This paper investigates the bit error rate (BER) performance of a radio-overfibre (RoF) system utilizing the binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) at a radio frequency (RF) of 5 GHz. The RF signal is externally modulated using the Mach-Zehnder modulator (MZM). The effects of noise sources and channels for the RoF link at distances of 30, 60, 90, 120 and 200 k...

Implanted medical devices are very important electronic devices because of their usefulness in monitoring and diagnosis, safety and comfort for patients. Since 1950s, remarkable efforts have been undertaken for the development of bio-medical implanted and wireless telemetry bio-devices. Issues such as design of suitable modulation methods, use of power and monitoring devices, transfer energy fr...

The impact of quantization on the energy efficiency of phase and frequency modulation is investigated. Transmission over the additive white Gaussian noise (AWGN) channel, and coherent and noncoherent fading channels is considered. It is assumed that the receiver quantizes the received signals by performing hard-decision detection. Closed-form expressions for the first and second derivatives of ...

The aim of the paper is to design a digital BPSK modulator for Ground Penetrating Radar applications. . The BPSK (Binary Phase Shift Keying) is one of the three basic binary modulation techniques. It has as a result only two phases of the carrier, at the same frequency, but separated by 180o. In this paper we took modulation as a main stream and analyzed about BPSK modulation technique on Xilin...

In this paper, the design of a wideband RF signal generator for demodulator/receiver testing is presented. The design of test generator is based on direct digital synthesizer (DDS) and voltage-controlled oscillator (VCO), controlled by microprocessor. It provides generation of arbitrary waveform signal up to 4.5 GHz. Output signal level is adjustable with precision of 0.5 dB. Dynamic range of R...

Underwater acoustic communication plays an important role in underwater wireless sensor network. Different from terrestrial radio channel, modeling of channel is very challenging due to its unique and dynamic characteristics. In order verify the proposed algorithms, a general emulation platform which can reduce verification cost has wide application prospect. this paper, we design hardware loop...