Based on a novel class of orthogonal pulse pairs, new full-response quadrature-quadrature phase-shift keying (QPSK) signal format is proposed in the paper. The proposed full-response QPSK signals can provide higher spectral compactness than conventional fullresponse QPSK signal, minimum-shift keying signal and quadrature phase-shift keying signal.

Binary phase shift keying (BPSK) and quadrature phase shift Keying (QPSK) modulation techniques are often proposed for satellite communications and band-limited communication channels; however, both modulations are important in high speed data communications. High speed data communications are implemented on high speed hardware in wireless systems. The paper presents the design of a QPSK and BP...

In this paper Bit Error Rate performance of QPSK modulation and OFDM -QPSK System over AWGN and Rayleigh fading channel is analyzed. The performance of BER of QPSK over AWGN and Rayleigh channel is compared. OFDM is an orthogonal frequency division multiplexing to reduce intersymbol interference problem. Simulation of QPSK signals is carried with both AWGN and Rayleigh channel. Finally simulati...

We experimentally demonstrate a reconfigurable optical tapped delay line in conjunction with coherent detection to search multiple patterns among quadrature phase shift keying (QPSK) symbols in 20 Gbaud data channel and also to equalize 20 and 31 Gbaud QPSK, 20 Gbaud 8 phase shift keying (PSK), and 16 QAM signals. Multiple patterns are searched successfully on QPSK signals, and correlation peak...

Using this assumption, the Bit Error Rate BER for BPSK, QPSK, 4PAM. The same case is between 64QAM and 16 QAM6db difference. Http:www.nxp.comacrobatdownloadapplicationnotesAN970471.pdfSince this scheme depends on the difference between successive phases, it is. In this latter case, the BER of QPSK is exactly the same as the BER of BPSK.Conditional pdf. Encode the information in phase difference...

In this paper, we have evaluated Bit Error Rate (BER) performance of interleave-division multiple-access (IDMA) systems with BPSK & QPSK modulation techniques when the system is subjected to Additive White Gaussian Noise (AWGN) in the channel. The BPSK and QPSK modulation techniques are already well trusted techniques with codedivision multiple-access (CDMA) systems however, IDMA scheme is refe...

This paper presents performance comparison of various modulation techniques in almouti scheme with Rayleigh fading channel. In the comparison, the space time coding has been used. The performance comparison are made on the basis of symbol error rate(SER) performance matrices over Rayleigh fading channel with 16-PSK,QPSK,PAM,16-QAM,64-QAM modulation technique. The comparison results show that in...

QPSK or Quadrature Phase-Shift Keying is a higher order modulation scheme used in digital modulation. A direct injection locked QPSK modulator uses VCO for minimize the area of the conventional modulator. In this project injection locking scheme is used since injection locking has an advantage inphase-noise reduction ofoscillators withavery simplecircuittopology. By using proposed simple modula...

Benefiting from the high spectrum efficiency and power efficiency, 6PolSK-QPSK (6-ary polarization-shift keying quadrature phase-shift keying) is a promising modulation format in coherent optical communication. We proposed a novel structure to generate the 6PolSK-QPSK with two dual-drive MZMs. Simulation results show that the proposed structure can generate 6PolSK-QPSK effectively and the perfo...

Analogous to multiple-symbol differential detection of quadrature phase-shift keying (QPSK), a multiple-bit differential detection scheme is described for offset QPSK that also exhibits continuous improvement in performance with an increasing observation interval. Being derived from maximum-likelihood (ML) considerations, the proposed scheme is purported to be the most power-efficient scheme fo...