In this paper, a low-complexity joint compensation scheme of carrier recovery (JCSCR) for coherent free-space optical (CFSO) communication is proposed. We applied the approach to CFSO system in quadrature phase shift keying (QPSK) modulation format. A signal-preprocessing stage, which effectively avoided repetitive operations found traditional schemes, was Unlike existing algorithms, modulated ...

A detail analysis of the performance of an orthogonal frequency division multiplexing (OFDM) transmission with different digital modulation techniques such as BPSK, QPSK and QAM has been carried out. BER performance has been determined for Additive white Gaussian Noise (AWGN) channel. The simulation results for the performance of OFDM using different digital modulation schemes BPSK, QPSK and QA...

In this paper, we propose an optical millimetre wave radio-over-fibre (mm-wave RoF) system that uses a dual drive Mach Zehnder modulator (DD-MZM), which is biased at the maximum transmission biasing point, to generate an optical double sideband-suppressed carrier. The input to the DD-MZM are binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 8-phase shift keying (8-PSK) and...

Joint Source-Channel Coding (JSCC) is a powerful technique that allows for the efficient transmission of information by simultaneously considering characteristics both source and channel. The recently proposed Exponential Golomb Error Correction (ExpGEC) Rice (REC) codes provide generalized JSCC schemes near capacity coding symbols drawn from large or infinite alphabets. Yet these require impra...

This paper describes the use of orthogonal space-time block codes to overcome the performance and complexity difficulties associated with the use of Shaped Offset QPSK (SOQPSK) modulation, a ternary continuous phase modulation (CPM), in multiple-input multiple-output telemetry systems. The orthogonal space-time block code is applied to SOQPSK waveforms in the same way it would be applied to sym...

The technique of equalization to compensate for the effect of the channel which causes distortion in transmitted signal. Different kinds of equalizers are used depending upon the application of the system and upon the kind of communication channel. The pro channel environment. The purpose of equalization system is to compensate for transmission as signal affected as frequency depended phase or ...