Ambient backscatter communication (AmBC) is an emerging technology enabling green Internet of Things deployments. The widespread acceptance this paradigm limited by the low signal-to-interference-plus-noise ratio (SINR) signal impinging on receiver antenna due to strong direct path interference and unknown ambient signal. adverse impact these two factors can be mitigated using noncoherent multi...

The problem of synchronous multiuser receiver design in the case of direct-sequence single-antenna code division multiple access (DS-CDMA) uplink networks is studied over frequency selective fading channels. An exact expression for the bit error rate (BER) is derived in the case of BPSK signaling. Moreover, an algorithm is proposed for finding the finite impulse response (FIR) receiver filters ...

This paper studies the effect of using higher order modulation formats in the performance of minimum mean-squared error (MMSE) receiver based direct-sequence (DS) code-division multiple access (CDMA) systems in terms of bit error rate (BER) at different loading levels in additive white Gaussian noise (AWGN) and slow fading channels. The performance of BPSK, QPSK, and 16QAM modulation formats ar...

We describe two classes of simple, effective techniques for reducing the average optical power requirement in intensity-modulated optical systems using multiple BPSK or QPSK subcarriers. The first class of techniques involves block coding between the information bits to be transmitted and the symbol amplitudes modulated onto the subcarriers in order to increase the minimum value of the multiple...

Wireless Sensor Network (WSN) holds the potential to open domains to distributed data acquisition. Minimizing the consumption of energy in a wireless sensor network application is crucial for effective realization of the intended application in terms of cost, li fetime and functionality. In this paper, we have tried to find out the average lifetime of the batteries calculated for BPSK, QPSK and...

The integration of wide variety of communication services is made possible with invention of 3G technology. Code Division Multiple Access 2000 operates on various RF channel bandwidths 1.2288 or 3.6864 Mcps (1x or 3x systems). It is a 3G system which offers high bandwidth and wireless broadband services but its efficiency is lowered due to various factors like fading, interference, scattering, ...

This paper addresses the estimation of carrier frequency for cyclostationary AM, BPSK, and QPSK signals in the presence of interfering signals and α-stable impulsive noise. The performance of conventional DFT algorithms suffers from severe degradation in impulsive noise environments. By fusing cyclostationarity and fractional lower-order statistics, we introduce a signal selective carrier frequ...

In this paper, a comprehensive study has been made on the performance evaluation of a two-layer spreading scheme based MC-CDMA wireless communication system. The 1⁄2-rated convolutionally encoded system under present study incorporates three linear signal detection techniques (Equalizers) such as Minimum Mean Square Error (MMSE), Zero Forcing (ZF) and Sphere Decoding (SD) under BPSK, DPSK, QPSK...

We report a novel real-time homodyne coherent receiver based on a DPSK optical-electrical-optical (OEO) regenerator used to extract a carrier from carrier-less phase modulated signals based on feed-forward based modulation stripping. The performance of this non-DSP based coherent receiver was evaluated for 10.66 Gbit/s BPSK signals. Self-homodyne coherent detection and homodyne detection with a...