نتایج جستجو برای: qpsk
تعداد نتایج: 1430 فیلتر نتایج به سال:
We demonstrate experimentally the transmission of single carrier 56 Gbaud 16-QAM, 8-QAM and QPSK optically modulated signals over 320, 960 and 2,880 km, respectively, using a fully packaged InP IQ modulator and a Stokes vector direct detection (SV-DD) receiver realized using discrete optics. Results show that by optimizing the carrier-to-signal-power ratio, the total throughput-times-distance p...
Modern wireless communication system demands high data rate with acceptable error rate transmission and reception. OFDM a multi-carrier modulation technique will provide the solution for next generation wireless communication, so that it has been employed in numerous wireless standards. This paper presents new technique for the error rate of OFDM-QPSK system over Nakagami-m and Nakagami-n (Rice...
In this paper impact of Reed Solomon coding over convolutional coding is analyzed for the different modulation techniques. In this paper communication system model employing GMSK, QPSK, and BPSK modulation techniques are implemented assuming the channel to be AWGN in nature. The simulation results obtained shows that GMSK using Reed Solomon encoding and decoding schemes gives improvement in Bit...
This paper presents the simulation results of digital modulation schemes BPSK and QPSK. Digital modulation is less complex, more secure and more efficient in long distance transmission. The noise detection and correction in digital is more efficient than analog. So it has more importance in modern communication system. These digital modulation schemes can be realized using FPGA ( Field Programm...
Practical realizations of the optimum closed loop structure for coherent demodulation of QPSK signals demands the approximation of the hyperbolic tangent nonlinearity (Tanh) with simpler and more easily implementable functions. This paper compares the commonly considered approximations to this nonlinearity and the practical structures which result, with an alternative in which the hyperbolic ta...
Orthogonal Frequency Division Multiplexing (OFDM) is one of the Strong candidate for Transmission of high data rate due to Multicarrier Modulation. One of the challenging Issue of OFDM is its high Peak to Average Power Ratio (PAPR or PAR). This Paper discusses different PAPR Reduction techniques in OFDM. The Classical Clipping, Selective Mapping, Tone reservation and Partial Transmit sequence T...
Recently, there has been a surge of interests, e.g., [2,3], in the design of so called “space-time” codes which take adv;antage of both the spatial diversity provided by multiple antennas and the temporal diversity available with time-varying fading. Design criteria [3-51 have been proposed for space-time codes in a variety of environments. In quasi-static Rayleigh fading channel, each possible...
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