Adaptive Equalization in Oversampled Subbands
نویسنده
چکیده
The potential presence of fractional delays, non-minimum phase parts, and a colouring of the channel output can require adaptive equalizers to adapt very long lters, which can have slow convergence for LMS-type adaptive algorithms. This paper presents a novel oversampled subband approach to adaptive equalization, which can both signi cantly reduce computational complexity, and improve convergence speed.
منابع مشابه
Efficient Subband Adaptive Filtering with Oversampled Gdft Filter Banks
This paper addresses the numerical efficiency of adaptive filtering implemented in subbands. Our approach first focuses on oversampled GDFT filter banks and their potential benefits over other possible subband decompositions. Although the subband filters presented use complex arithmetic, the discussed method allows factorization into a real valued polyphase network, followed by a complex GDFT m...
متن کاملExperimental Results of a Modified Architecture for Oversampled, Subband Acoustic Echo Cancellers
The motivation for adaptive filtering in subbands stems from two well-known problems in LMS-based fullband adaptive filtering. First, the convergence and tracking can be very slow if the input correlation matrix is ill conditioned such as that found in speech. Second, very high order adaptive filters are computationally expensive. Adaptive filtering in subbands has been proposed to overcome the...
متن کاملA Filterbank Design for Oversampled Filter Banks without Aliasing in the Subbands
In this paper we propose a new strategy for the design of real-valued lterbanks which avoids aliasing in the subbands (\inband aliasing") such that applications where two subband signals have to be compared become possible. One example for such an application is subband adap-tive ltering, where, with the proposed lter-bank structure, the traditionally required cross-term adaptive lters between ...
متن کاملFilter Bank Based Frequency Domain Equalizer in Single Carrier Modulation
This paper is concerned with the use of complexmodulated oversampled filter bank for frequency domain equalization in single carrier systems. A novel equalizer structure consisting of a low order linear phase FIR and an all-pass filter is applied in subband-wise compensation of channel amplitude and phase distortions separately. The performance of the proposed filter bank based frequency domain...
متن کاملTh2A.33 A Fully-Blind Fractionally-Oversampled Frequency Domain Adaptive Equalizer
A frequency domain adaptive equalizer, operating with fewer than 2 Sa/Symbol is investigated. Steady state performance and dynamic operation are demonstrated without equalizer training. We find that the equalizer exhibits no penalty as low as 1.1 Sa/Symbol. OCIS codes: (060.4510) Optical communications, (060.1660) Coherent communication.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998