This paper addresses some primary performance impacts of non-stationary noise on DSL systems. First, this paper points out some erroneous assumptions used in “Selected Measurement on Non-Stationary and Stationary Crosstalk Effects upon FDM ADSL” [1]. Additionally, a description is given of how the burst nature of EtherLoop allows the modem to continue to operate in the presence of wideband burs...

This paper is focused on the description of the physical layer of a new acoustic modem called ITACA. The modem architecture includes as a major novelty an ultra-low power asynchronous wake-up system implementation for underwater acoustic transmission that is based on a low-cost off-the-shelf RFID peripheral integrated circuit. This feature enables a reduced power dissipation of 10 μW in stand-b...

Soft Modems use the main processor to execute modem functions traditionally performed by hardware on the modem card. To function correctly, soft modems require that ongoing signal processing computations be performed on the host CPU in a timely manner. Thus, signal processing is a commonly occurring background real-time application—one running on systems that were not designed to support predic...

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The exponentially-growing mobile data traffic imposes significant demands on the capacity of the mobile network. Fiber optic and microwave links are two main solutions for the mobile backhaul network, which provides connectivity between radio base station (RBS) sites and the switch sites. As compared to fiber, a microwave solution is much easier to deploy, however, its capacity is lower. This t...

Cable networks have evolved from offering broadcast services to providing high rate two-way data services. In the next step, cable operators intend to use Voice over IP (VoIP) to provide cable telephony services. In a cable network the users are connected to the headend through a cable modem. The headend is responsible for allocating upstream bandwidth to the various cable modems. Each cable mo...

ALGORITHM FOR A NARROWBAND WIRELESS MODEM J. H. Grimm, R. N. Kumar, J. Kusuma, and J. V. Krogmeier School of Electrical and Computer Engineering Purdue University West Lafayette, IN 47907-1285 http://yake.ecn.purdue.edu/ cominfo/ ABSTRACT This paper examines some of the complexity issues arising in the real time implementation of the symbol timing subsystem of a narrowband wireless modem. The m...

Space Engineering SpA has recently developed a multi-processor, multi-FPGA (Field Programmable Gate Array), compact platform, including a multiple analog interface based on high-speed and high-accuracy ADC (Analog to Digital Converter) and DAC (Digital to Analog Converter). The platform with related software is intended to be a potentially powerful development system for the implementation of s...