A novel photonic vector THz-wave signal generation at terahertz-wave (THz-wave) band by Mach Zendell modulator (MZM) -based optical frequency comb and in-phase quadrature (IQ) for modulation scheme is proposed. And we demonstrate 16 quadrature-amplitude-modulation (QAM) transmission simulation. The IQ driven a 2-Gbaud/3-Gbaud 16-QAM-modulated baseband signal.The MZM radio the of 30 GHz to gener...

In this paper we estimate the performance of 2*3 MIMO-MC-CDMA system using convolution code in MATLAB which highly reduces BER by increasing the efficiency of system. MIMO and MC-CDMA system combination is used to reduce bit error rate and also for forming a new system called MC-CDMA which is multi user and multiple access schemes used to increase the performance of the system. MC-CDMA system i...

The denoise-and-forward (DNF) method of physical-layer network coding (PNC) is a promising approach for wireless relaying networks. Most related work in the literature focuses on low-level modulations, such as binary phase-shift keying (BPSK) or quadrature phase-shift keying (QPSK). In this paper, we consider DNF-based PNC with high-level modulations, specifically the M-ary quadrature amplitude...

In this paper, we derive for the first time the analytical expression of the CramerRao lower bound (CRLB) for non-data-aided (NDA) carrier phase estimation from quadrature amplitude modulated (QAM) signals over flat Rayleigh fading channel (FRFC), where the fading gain is not constant during the observation window. The second derivative of the neperian logarithm of the probability density funct...

This paper discusses the design and field programmable gate array (FPGA) implementation of a configurable 18-tap fractionally-spaced blind adaptive equalizer intellectual property (IP) core for quadrature amplitude modulation (QAM) signals. The design can be configured to implement the constant modulus algorithm (CMA), multimodulus algorithm (MMA), radius-adjusted modified-multimodulus algorith...

This paper deals with low maximum-likelihood (ML)-decoding complexity, full-rate and full-diversity space-time block codes (STBCs), which also offer large coding gain, for the 2 transmit antenna, 2 receive antenna (2 2) and the 4 transmit antenna, 2 receive antenna (4 2) MIMO systems. Presently, the best known STBC for the 2 2 system is the Golden code and that for the 4 2 system is the DjABBA ...

In any communication systems, transceiver is used to transmit and receive the modulated signal. Modulation and demodulation is the process to change and recover the original message signals. In recent times, quadrature amplitude modulation (QAM) and Differential phase shift keying (DPSK) modulation scheme has been used in the wide range of applications, because of high data rate and Spectral ef...

Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) approach using UWB signals with short duration of pulses provide unique advantages in short-range high data rate wireless applications which include easy penetration through obstacles, high precision ranging and low processing power. In this paper a performance study on MB-OFDM is attempted for high data rate ultra wideband (UWB) WP...

A new distance-adjusted approach is proposed in which static square contours are defined around an estimated symbol in a QAM constellation, which create regions that correspond to fixed step sizes and weighting factors. As a result, the equalizer tap adjustment consists of a linearly weighted sum of adaptation criteria that is scaled by a variable step size. This approach is the basis of two ne...