In this work we consider a multiple-input multiple-output (MIMO) dual-function radar-communication (DFRC) system, which senses multiple spatial directions and serves users. Upon resorting to an orthogonal frequency division multiplexing (OFDM) transmission format differential phase shift keying (DPSK) modulation, study the design of radiated waveforms receive filters employed by radar The appro...

In this paper, a new cryptographic system is constructed using a combination of a hyperelliptic curve of genus g 1⁄4 2 over the Galois field GF(2) and a Reed–Solomon code (N, K) over the Galois field GF(2) and this system uses a smaller key than the elliptic curves cryptosystem and the Rivest, Shamir, and Adleman cryptosystem. The design criterion for the combination can be expressed as the dat...

There has been a significant improvement in high-speed electronics and optical components over the past few years, and this is one of the key enabling factors for high data rate transmission. Moreover, multilevel modulation formats, which encode information onto the carrier’s amplitude and phase, are necessary to increase the spectral efficiency of communication systems. For short-haul low cost...

The bit error rate (BER) expression and performance of free-space optical communication link in clear but turbulent atmosphere using subcarrier intensity modulation (SIM) with differential phase shift keying (DPSK) is presented. The practical linear combining technique suitable for differentially modulated data (selection combining) is considered and its performance evaluated under weak atmosph...

Application of a spectrally efficient coded modulation technique called Trellis Coded Modulation (TCM) to optical Differential Quadrature Phase Shift Keying (oDQPSK) is discussed. Symbol Error Rate (SER) performance of the resultant system in the presence of Amplified Spontaneous Emission (ASE) noise is evaluated using the Karhunene Loeve Series Expansion (KLSE) method. Optical Signal to Noise ...

The objective of this paper is to compare the performance of coherent and non-coherent modulation schemes with the use of error correcting codes and Artificial Neural Network (ANN) assisted equalization as an aid to Maximal Ratio Combining (MRC) in order to improve bit error rate (BER) values of demodulated signals in wireless channels. The wireless channels are assumed to have both Gaussian an...

In this paper, the gamma–gamma probability distribution is used to model turbulent channels. The bit error rate (BER) performance of free space optical (FSO) communication systems employing on-off keying (OOK) or subcarrier binary phase-shift keying (BPSK) modulation format is derived. A tip-tilt adaptive optics system is also incorporated with a FSO system using the above modulation formats. T...

This paper describes a modification of the conventional M-ary Differential Phase Shift Keying MDPSK scheme. This method reduces the number of phases which improves the performance of the system by applying a mathematical method from the combinatorial theory called Balanced Incomplete Block Design BIB-design. It is a coding modulation technique in which the signal is represented by a set of phas...