Journal ArticleDOI
Adaptive Reduced-Rank Processing Based on Joint and Iterative Interpolation, Decimation, and Filtering
TLDR
An iterative least squares (LS) procedure to jointly optimize the interpolation, decimation and filtering tasks for reduced-rank adaptive filtering for interference suppression in code-division multiple-access (CDMA) systems is described.Abstract:
We present an adaptive reduced-rank signal processing technique for performing dimensionality reduction in general adaptive filtering problems. The proposed method is based on the concept of joint and iterative interpolation, decimation and filtering. We describe an iterative least squares (LS) procedure to jointly optimize the interpolation, decimation and filtering tasks for reduced-rank adaptive filtering. In order to design the decimation unit, we present the optimal decimation scheme and also propose low-complexity decimation structures. We then develop low-complexity least-mean squares (LMS) and recursive least squares (RLS) algorithms for the proposed scheme along with automatic rank and branch adaptation techniques. An analysis of the convergence properties and issues of the proposed algorithms is carried out and the key features of the optimization problem such as the existence of multiple solutions are discussed. We consider the application of the proposed algorithms to interference suppression in code-division multiple-access (CDMA) systems. Simulations results show that the proposed algorithms outperform the best known reduced-rank schemes with lower complexity.read more
Citations
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Journal ArticleDOI
Orthogonal Space Projection (OSP) Processing for Adaptive Interference Cancellation
TL;DR: An Orthogonal Space Projection processing methodology is introduced that achieves interference cancellation within a single time compression interval, e.g. pulse interval for fast time or dwell interval for slow time.
Posted Content
Study of Opportunistic Cooperation Techniques using Jamming and Relays for Physical-Layer Security in Buffer-aided Relay Networks.
Xiaotao Lu,Rodrigo C. de Lamare +1 more
TL;DR: A hybrid algorithm to set a signal-to-interference and noise ratio (SINR) threshold at the node to determine the type of signal stored at the relay node is proposed and obtained a significant improvement in secrecy rate over previously reported algorithms.
Proceedings ArticleDOI
A structure-based subspace fitting approach for interference rejection in moving uniform linear array
Shun He,Guoming Li +1 more
TL;DR: A structure-based two-stage signal subspace reconstruction is performed to obtain an accurate estimate of the interference subspace with small training-data support and the performance of the proposed approach is evaluated based on numerically simulation.
Posted Content
Review of Buffer-Aided Distributed Space-Time Coding Schemes and Algorithms for Cooperative Wireless Systems
Jiaqi Gu,Rodrigo C. de Lamare +1 more
TL;DR: Simulation results show that the proposed dynamic buffer-aided DSTC schemes and algorithms outperform prior art.
Journal ArticleDOI
Adaptive constrained CM-based multicarrier-CDMA receivers in multipath fading channels
Jun-Da Chen,Ye-Shun Shen +1 more
TL;DR: Two blind adaptive receivers, based on constrained constant modulus (CM) algorithms, are investigated for the detection of the multicarrier code division multiple access (MC-CDMA) system in the multiuser and multipath channels and the symbol error rate (SER) performance of the full-Tap receiver is better than that of the reduced-tap receiver in severe interference environments.
References
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Book
Adaptive Filter Theory
TL;DR: In this paper, the authors propose a recursive least square adaptive filter (RLF) based on the Kalman filter, which is used as the unifying base for RLS Filters.