Results 241 to 250 of about 204,888 (292)

Rprop and improved Rprop+ based constant modulus type (RCMT) blind channel equalization algorithm for QAM signal

Journal of Information and Optimization Sciences, 2019
The aim of paper is to address the issues such as poor convergence, moderate BER, residual ISI associated with unsupervised (blind) weight adaptation technique employed for channel equalization.
Prakhar Priyadarshi, C. Rai, Gobind Singh Inderprastha   +2 more
semanticscholar   +1 more source

Efficient reinitialization of the prewhitened constant modulus algorithm

IEEE Communications Letters, 2001
We present a reinitialization scheme for blind equalizers adapted via the constant modulus algorithm (CMA) when an all-pole prefilter is included to whiten the received signal. The mechanism exploits the special structure of the minimum mean squared error (MMSE) equalizers and their relation with CMA equalizers. A heuristic rule for blind determination
Roberto López-Valcarce, Fernando Pérez-González   +1 more
openaire   +1 more source

On the Design of Multi-Spectrally Constrained Constant Modulus Radar Signals

IEEE Transactions on Signal Processing, 2020
This paper deals with the synthesis of constant modulus waveforms that optimize radar performance while satisfying multiple spectral compatibility constraints.
A. Aubry, A. De Maio, Mark A. Govoni, Lorenzo Martino   +3 more
semanticscholar   +1 more source

Incorporation of linear constraints into the constant modulus algorithm

International Conference on Acoustics, Speech, and Signal Processing, 2003
A linearly constrained version of the constant modulus algorithm (CMA) is developed. It is based on the decomposition property of the generalized sidelobe canceller (GSC) filter structure. When they can be specified, linear constraints are an effective means of incorporating a priori information into the constant modulus algorithm. Exploitation of this
Michael J. Rude, Lloyd J. Griffiths
openaire   +1 more source

The dithered signed-error constant modulus algorithm

Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), 2002
Adaptive blind equalization has gained widespread use in communication systems that operate without training signals. In particular, the constant modulus algorithm (CMA) has become a favorite of practitioners due to its LMS-like complexity and desirable robustness properties.
Philip Schniter, C. Richard Johnson Jr.
openaire   +1 more source

Fixed point analysis of the constant modulus algorithm

2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002
The steady-state performance of adaptive equalizers can significantly vary when they are implemented in finite precision arithmetic, which makes it vital to analyze their performance in a quantized environment. We present a fixed point analysis for the steady-state mean square error (MSE) of a blind adaptive equalizer and the optimal value of the step ...
Yousef, Nabil R, Sayed, Ali H.
openaire   +1 more source

A Supervised Constant Modulus Algorithm for Blind Equalization

Wireless Personal Communications, 2010
Blind equalization is a technique for adaptive equalization of a communication channel without the aid of the usual training sequence. Although the Constant Modulus Algorithm (CMA) is one of the most popular adaptive blind equalization algorithms, it suffers from slow convergence rate. A novel enhanced blind equalization technique based on a supervised
Ali Özen, Ismail Kaya, Birol Soysal
openaire   +2 more sources

A normalized constant-modulus algorithm

Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers, 2002
The constant-modulus algorithm (CMA), while the most commonly used blind equalization technique, converges very slowly. We propose a "normalized" constant-modulus algorithm (analogous to the widely used normalized LMS algorithm) with an adjustable step size that greatly increases the convergence rate for noise colorings with large eigenvalue spreads ...
openaire   +1 more source

A real-arithmetic implementation of the constant modulus algorithm

ICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
An earlier paper [1] presented the Constant Modulus Algorithm, an adaptive filtering algorithm which can be employed to remove interference and equalize propagation anomolies that impair communications via constant envelope signals, such as FM and QPSK.
John R. Treichler, Michael G. Larimore
openaire   +1 more source

Spectrally Compatible MIMO Radar Beampattern Design Under Constant Modulus Constraints

IEEE Transactions on Aerospace and Electronic Systems, 2020
In this article, we propose a new algorithm that designs a transmit beampattern for multiple-input multiple-output (MIMO) radar considering coexistence with other wireless systems.
Khaled Alhujaili, Xianxiang Yu, G. Cui, V. Monga   +3 more
semanticscholar   +1 more source