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In this paper, we investigate the optimal power allocation scheme for relay networks with finite-alphabet constraints. It has been shown that the previous work utilizing various design criteria with the Gaussian inputs assumption may lead to significant loss for a practical system with finite constellation set constraint, especially when signal-to-noise ratio (SNR) is in medium-to-high regions, or...
For modulation recognition and demodulation of non-cooperative digital signals, the symbol rate is an unknown but important parameter. After an investigation of present methods in this active research area, this paper proposes a new symbol rate estimation algorithm, namely ??MORAL??, based on Morlet wavelet transform and autocorrelation, in which the time-frequency features of Phase Shift Keying (PSK)...
In this paper, a novel chirp based modulation and detection strategy for wireless communication systems using fractional Fourier transform (FrFT) is presented. In this scheme, the input data are mapped onto two chirp signals which have different initial frequencies and the same chirp rate, the received signals are detected and extracted by using FrFT. We evaluate the performance of proposed system...
In this paper, we study a MB-OFDM UWB system using reduced complexity decoding algorithm for LDPC codes. Focusing on the system simulation and performance analysis, we design a high rate MB-OFDM UWB system and run a complete simulation for such system over the additive white Gaussian noise(AWGN) channel and IEEE UWB channel. Simulation results show that the bit error rate (BER) performance of such...
A new scheme of the extended irregular repeat- accumulate (eIRA) coded tamed frequency modulation (TFM) for deep space communications is introduced in this paper. It is mainly based on the optimal concatenation of the eIRA code and the continuous phase encoder (CPE) decomposed from TFM. In order to obtain good performance of the eIRA coded TFM, the main principle of our scheme is to jointly optimize...
Signal-to-noise ratio (SNR) estimation is an important issue in many communication systems. This paper proposed a new non-data-aided (NDA) SNR estimator for BPSK and QPSK modulated signals. The estimation is based on pseudo-error probability (PEP), which can be estimated without additional cost for sampled systems. The performance of the proposed estimator is examined numerically in terms of its bias...
This paper introduces a new parallel scheme of Godard's constant modulus algorithm which can be easily implemented by hardware. With the criterion of Godard's constant modulus, stochastic gradient decency and block minimum mean square error, it realizes a parallel equalizer by adaptively adjusting the tap-weight vector. From numeric analysis and simulation, it is manifested that our scheme for quadrature...
Network coding is a new concept to realize efficient transmission in multimedia communication network. The basic idea is that intermediate nodes in a network are allowed not only to perform routing but also to encourage certain functions on its received data. In this paper, we present a new transmission diversity scheme which employs network coding to provide energy efficient multimedia transmission...
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