In this paper we transmit different complimentary codes using QPSK (Quadrature phase shift keying) modulation technique. The signal which is transmitted is scattered back from the target and send to the receiver for the demodulation. Using matlab a digital processing algorithm is designed for resolving range resolution and Doppler localization of a target using different complimentary codes lik...

The transmission performance of coherent dual-polarization multi-band OFDM (DP-MB-OFDM) and QPSK (DP-QPSK) are experimentally compared for 100 Gb/s long-haul transport over legacy infrastructure combining G.652 fiber and 10 Gb/s WDM system. It is shown that DP-MB-OFDM and DP-QPSK have nearly the same performance at 100 Gb/s after transmission over a 10 × 100-km fiber line. Furthermore, the orig...

We present an 8-dimensional trellis-coded 8PSK with a symbol transition constraint that is similar to that of =4-shift quadrature phase shift keying(QPSK). This scheme can achieve a coding gain of 1.6 to 2.4 dB at the same rate of =4shift QPSK on Gaussian channel, and it has also an immunity against the integer multiples of 90 phase ambiguities. In order to label the constellation of the propos...

The authors present theoretical performance analysis and simulation results for Quadrature-Quadrature Phase Shift Keying (QPSK), Constant Envelope (CE) QPSK, and trelliscoded 16D CEQPSK in ideal bandlimited channels of various bandwidths. The performance of receivers with and without channel estimation is reported. Spectral analysis is presented for each system, in addition to MSK and expanded ...

We experimentally demonstrate a tunable optical correlator to search for multiple patterns among QPSK symbols. We utilize an optical frequency comb to generate the coherent signals and multiplex them coherently in a single PPLN waveguide. Multiple patterns with different lengths are successfully searched within QPSK symbols in a 40-Gb/s signal.

This paper presents the advantage of using a new modulation scheme called dual carrier Modulation (DCM) compared to classical Quadrature Phase Shift Keying (QPSK) modulation. This comparison is done at data transmission broadband in Multiband OFDM system (MBOFDM) based on Ultra Wide Band UWB. Simulation results show that the use of the modulation DCM for high data rates is more efficient compar...

Quadrature Phase Shift Keying (QPSK) is one of the important and commonly used modulation formats. Phase precoding was recently proposed as a new approach to achieve blind recovery of co-channel QPSK signals in the CDMA context. In this paper, we propose a new blind receiver for phase precoded QPSK signals, whose performance is significantly better, and close to that of anMMSE receiver. The rec...