Pii: S0141-9331(99)00006-x
نویسنده
چکیده
Broadcast digital subscriber lines (BDSL) can provide a cost-effective architecture to deploy digital broadcast services in the near future by utilizing the in-place unshielded twisted-pairs. In the BDSL system, all broadcasting channels can share the same transmitter to reduce the cost. Because all twisted-pairs transmit the same BDSL signal in the downstream direction, both nearand far-end crosstalk can be eliminated. While HDSL and Asymmetrical Digital Subscriber Lines (ADSL) signals are carried at low frequency band, BDSL signals can be transmitted at higher frequency band. A discrete multitone based modulation method is used to increase the efficiency of BDSL. Compared to scheme employing identical modulation for all subchannels, the channel though-put of low frequency subchannels can be increased because of their smaller channel losses and the high frequency subchannels can be utilized even if their signal-to-noise ratios are small. The combination of HDSL, ADSL, and BDSL can provide subscribers many digital one-to-one and broadcasting broadband services. q 1999 Elsevier Science B.V. All rights reserved.
منابع مشابه
High-performance implementation of wavelet algorithms on a standard PC
In this paper, we discuss the issue of implementing signal processing algorithms on a standard PC. As an example, we present a software implementation of a wavelet-based image processing algorithm. The implementation has been optimized for the Pentium III processor. Based on a careful analysis of the problem, we show that the implementation performance is limited by the memory bandwidth. This i...
متن کاملDetermination of processor allocation in the design of processor arrays
This paper deals with the design of processor arrays for algorithms which can be represented as systems of uniform recurrence equations. We present an approach to determine allocation functions as part of this design. The objective of our approach is to generate allocation functions minimizing the necessary chip area for a hardware implementation of a processor array. At first, we propose an al...
متن کاملQoS management for MPEG-4 flows in wireless environment
QoS represents one of the most crucial issues as it involves many different aspects and directly impacts the user satisfaction. In this paper we will tackle the very complex and challenging issue to develop a comprehensive architecture to allow mobile wireless user to acces MPEG4 flows while moving and at a given level of QoS. We will assume that network resources are managed according to the G...
متن کاملA guide to migrating from microprocessor to FPGA coping with the support tool limitations
Eduardo Augusto Bezerra and Michael Paul Gough Abstract Microprocessors have been used as the main processing elements of embedded systems mainly because of their low cost, flexibility for system upgrade at the software level and because of the availability of efficient support tools. The configurable computing technology brought the software flexibility to the hardware level, but the limitatio...
متن کامل