Anthony D. Fagan

Learn More
We reformulate the minimum mean squared error (MMSE) solution for time domain equalization (TEQ) in multitone transceivers. We show that the maximum shortening signal-to-noise ratio (MSSNR) and minimum intersymbol interference (min-ISI) TEQs are particular cases of our new formulation. With good channel estimation, the MMSE-TEQ achieves near-optimal rate(More)
In this paper we propose a new approach for adaptive echo cancellation: the Gauss-Seidel Pseudo Affine Projection algorithm (GSPAP). It is proved by simulations that it is stable, fast convergent and has good tracking abilities. The computational complexity of the GSPAP algorithm is evaluated. It is shown that its simplified and division-less version(More)
In this paper we propose a new stable Fast Affine Projection algorithm based on Gauss-Seidel iterations (GSFAP). We investigate its implementation using the logarithmic number system (LNS) and compare it with other two FAP algorithms. A method to simplify its implementation is also proposed. We show that the 32-bit or 20-bit LNS implementation of the GSFAP(More)
A novel pilot-based channel estimation scheme is proposed for frequency selective Rayleigh fading channels which works in conjunction with the existing paradigm of turbo-equalization. The iterative nature of the channel estimation technique provides substantial gain over non-iterative methods, and makes it a suitable choice for iterative equalization and(More)
We propose a novel, high speed, low memory fully programable FPGA decoder architecture to decode quasi-cyclic LDPC codes. By performing optimizations at the code construction, algorithmic and architecture levels we are able to achieve significant throughput and memory storage advantages over current FPGA decoder implementations. Our decoder employs the(More)
—This paper presents a system architecture for low-density parity-check (LDPC) codes that allows dynamic switching of LDPC codes within the encoder and decoder without hardware modification of these modules. Thus, rate compatibility is facilitated without the performance degradation inherent in a puncture-based system. This versatility also allows the LDPC(More)
Melsa et al. [1] presented a channel shortening technique for Discrete M ultitone transceivers that reduces Intersymbol Interference (ISI) by forcing the effective channel's impulse response to lie within a window of v+1 consecutive samples. Arslan et al. [2] claim that although this method is intuitive, no previous study has been made on its optimality.(More)
—A pilot-based channel estimation scheme is proposed for frequency selective Rayleigh fading channels which works in conjunction with the existing paradigm of turbo equalization. The iterative nature of the channel estimation technique provides substantial gain over noniterative methods and makes it a suitable choice for iterative equalization and decoding.(More)
Wavelet Packet Modulation (WPM) uses an arbitrary time-frequency plane tiling to create orthogonal subchannels of different bandwidths and symbol rates in a multichannel system. The Wavelet Packet Tree is implemented by iterating a perfect reconstruction two channel transmultiplexer. We derive operating conditions for the capacity-optimal tree for a given(More)