Conferences related to Subscriber-line Modems

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ICC 2021 - IEEE International Conference on Communications

IEEE ICC is one of the two flagship IEEE conferences in the field of communications; Montreal is to host this conference in 2021. Each annual IEEE ICC conference typically attracts approximately 1,500-2,000 attendees, and will present over 1,000 research works over its duration. As well as being an opportunity to share pioneering research ideas and developments, the conference is also an excellent networking and publicity event, giving the opportunity for businesses and clients to link together, and presenting the scope for companies to publicize themselves and their products among the leaders of communications industries from all over the world.


GLOBECOM 2020 - 2020 IEEE Global Communications Conference

IEEE Global Communications Conference (GLOBECOM) is one of the IEEE Communications Society’s two flagship conferences dedicated to driving innovation in nearly every aspect of communications. Each year, more than 2,900 scientific researchers and their management submit proposals for program sessions to be held at the annual conference. After extensive peer review, the best of the proposals are selected for the conference program, which includes technical papers, tutorials, workshops and industry sessions designed specifically to advance technologies, systems and infrastructure that are continuing to reshape the world and provide all users with access to an unprecedented spectrum of high-speed, seamless and cost-effective global telecommunications services.


ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

The ICASSP meeting is the world's largest and most comprehensive technical conference focused on signal processing and its applications. The conference will feature world-class speakers, tutorials, exhibits, and over 50 lecture and poster sessions.


2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

The Conference focuses on all aspects of instrumentation and measurement science andtechnology research development and applications. The list of program topics includes but isnot limited to: Measurement Science & Education, Measurement Systems, Measurement DataAcquisition, Measurements of Physical Quantities, and Measurement Applications.


IEEE INFOCOM 2020 - IEEE Conference on Computer Communications

IEEE INFOCOM solicits research papers describing significant and innovative researchcontributions to the field of computer and data communication networks. We invite submissionson a wide range of research topics, spanning both theoretical and systems research.



Periodicals related to Subscriber-line Modems

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Communications Letters, IEEE

Covers topics in the scope of IEEE Transactions on Communications but in the form of very brief publication (maximum of 6column lengths, including all diagrams and tables.)


Communications Magazine, IEEE

IEEE Communications Magazine was the number three most-cited journal in telecommunications and the number eighteen cited journal in electrical and electronics engineering in 2004, according to the annual Journal Citation Report (2004 edition) published by the Institute for Scientific Information. Read more at http://www.ieee.org/products/citations.html. This magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications ...


Communications, IEEE Transactions on

Telephone, telegraphy, facsimile, and point-to-point television, by electromagnetic propagation, including radio; wire; aerial, underground, coaxial, and submarine cables; waveguides, communication satellites, and lasers; in marine, aeronautical, space and fixed station services; repeaters, radio relaying, signal storage, and regeneration; telecommunication error detection and correction; multiplexing and carrier techniques; communication switching systems; data communications; and communication theory. In addition to the above, ...


Computer

Computer, the flagship publication of the IEEE Computer Society, publishes peer-reviewed technical content that covers all aspects of computer science, computer engineering, technology, and applications. Computer is a resource that practitioners, researchers, and managers can rely on to provide timely information about current research developments, trends, best practices, and changes in the profession.


Instrumentation and Measurement, IEEE Transactions on

Measurements and instrumentation utilizing electrical and electronic techniques.



Most published Xplore authors for Subscriber-line Modems

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Xplore Articles related to Subscriber-line Modems

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Multi-user discrete bit-loading for DMT-based DSL systems

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE, 2002

This paper investigates the multiuser bit and power allocation problem in discrete multi-tone digital subscriber line modems. A spectrum-management center with knowledge of direct and crosstalk-coupled channel gains allocates the bits and the available power to the subchannels for all users in a common binder. The center uses a multiuser discrete bit-loading algorithm that attempts to minimize the total transmit ...


Chebyshev interpolation for DMT modems

2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004

Sampling clock synchronization in discrete multitone systems, such as digital subscriber line modems can be done with a phase locked loop. This requires expensive analog hardware, such as a voltage controlled oscillator. However, it is possible to use a cheaper free-running oscillator and tackle the problem in the digital domain. Using resampling or interpolation, the timing correction becomes transparent for ...


Development of an automation process for ADSL interoperability and reliability tests

Proceedings of the Thirty-Seventh Southeastern Symposium on System Theory, 2005. SSST '05., 2005

There are issues of interoperability with digital subscriber line (DSL) modems and digital subscriber line access multiplexer (DSLAM). We performed interoperability and reliability tests for asymmetric digital subscriber line (ADSL) system. We followed DSL forum defined standard TR-048 for ADSL interoperability tests [DSL Forum Technical Report, 2002]. This is an intensive and laborious test process. We developed an automation process ...


Effects of bursty crosstalk in DSL

IEEE Communications Letters, 2002

We propose a simple model for the bursty operation of digital subscriber line (DSL) modems. Based on this model, we derive the autocorrelation and the power spectrum density (PSD) of the bursty crosstalk. We analyze the effects of bursty operation in both the crosstalk PSD and the training of the DSL modem. This analysis suggests that both the duty cycle ...


Resource allocation in DMT transmitters with per-tone pulse shaping

2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 2008

Per-tone pulse shaping has been proposed as an alternative to time domain spectral shaping for DMT transmitters, e.g. VDSL modems. It shapes the spectrum of individual tones such that the stop band energy of each tone can be minimized. This in particular enables transmitter to use more tones without violating the PSD mask constraint for data transmission. In per-tone pulse ...



Educational Resources on Subscriber-line Modems

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IEEE-USA E-Books

  • Multi-user discrete bit-loading for DMT-based DSL systems

    This paper investigates the multiuser bit and power allocation problem in discrete multi-tone digital subscriber line modems. A spectrum-management center with knowledge of direct and crosstalk-coupled channel gains allocates the bits and the available power to the subchannels for all users in a common binder. The center uses a multiuser discrete bit-loading algorithm that attempts to minimize the total transmit power given a target sum-rate. This algorithm extends the greedy algorithm for the single-user channel to the multi-user channel. Simulation results for the upstream transmission in very high-speed digital subscriber line show that the total power can be reduced using the multi-user discrete bit-loading algorithm instead of applying. the single-user greedy algorithm iteratively.

  • Chebyshev interpolation for DMT modems

    Sampling clock synchronization in discrete multitone systems, such as digital subscriber line modems can be done with a phase locked loop. This requires expensive analog hardware, such as a voltage controlled oscillator. However, it is possible to use a cheaper free-running oscillator and tackle the problem in the digital domain. Using resampling or interpolation, the timing correction becomes transparent for subsequent equalizers. This article describes a novel resampling technique using Chebyshev polynomials.

  • Development of an automation process for ADSL interoperability and reliability tests

    There are issues of interoperability with digital subscriber line (DSL) modems and digital subscriber line access multiplexer (DSLAM). We performed interoperability and reliability tests for asymmetric digital subscriber line (ADSL) system. We followed DSL forum defined standard TR-048 for ADSL interoperability tests [DSL Forum Technical Report, 2002]. This is an intensive and laborious test process. We developed an automation process using TCL script. We also used Perl scripting for formatting data. We used Lucent's DSLAM, Spirent Communication's Line simulators and Traffic generators. For testing we used several vendor's ADSL modems. Our automation process saved time and thus testing cost. The automation process can be modified as needed and thus differs from the existing commercial test suite. Commercial test suite is hardware specific automation but we can modify our scripts any time depending on the hardware. Thus this automation can be used as a general platform and can be modified as needed.

  • Effects of bursty crosstalk in DSL

    We propose a simple model for the bursty operation of digital subscriber line (DSL) modems. Based on this model, we derive the autocorrelation and the power spectrum density (PSD) of the bursty crosstalk. We analyze the effects of bursty operation in both the crosstalk PSD and the training of the DSL modem. This analysis suggests that both the duty cycle and the bursty activity rate must be optimized when bursty crosstalk is used to increase the performance of crosstalk-limited systems.

  • Resource allocation in DMT transmitters with per-tone pulse shaping

    Per-tone pulse shaping has been proposed as an alternative to time domain spectral shaping for DMT transmitters, e.g. VDSL modems. It shapes the spectrum of individual tones such that the stop band energy of each tone can be minimized. This in particular enables transmitter to use more tones without violating the PSD mask constraint for data transmission. In per-tone pulse shaping based DMT transmitters a fixed length pulse shaping filter is typically used for every tone. The tones in the middle of the pass band however, contribute less to the overall stop band energy, so that using a high order pulse shaping filter for these tones does not result in a significant reduction of the stop band energy. As a result a significant number of pulse shaping filter taps are wasted on the tones in the middle of the pass band and do not bring any performance gain. Using a variable length pulse shaping filter which is designed such that the PSD mask constraint is not violated can then significantly reduce the total number of pulse shaping filter taps without compromising performance. In this paper, a resource allocation technique is presented for variable length pulse shaping filter design using a dual problem formulation. This optimally solves the problem of pulse shaping filter tap distribution over tones for given PSD mask constraints, with a relatively low complexity.

  • Analysis of bursty crosstalk in DSL

    We propose a simple model for the bursty operation of digital subscriber line (DSL) modems. Based on this model, we derive a power spectrum density (PSD) for the bursty crosstalk. This analysis suggests that both the duty cycle and the bursty activity rate must be optimized when bursty crosstalk is used to increase the performance of crosstalk-limited systems.

  • Henry Samueli

    With the explosion in the popularity of cable and digital subscriber line modems for high-speed Internet access, the odds are that there will be one of these broadband communications devices in many homes or offices. The odds are that the chips inside the modem will have been designed by Broadcom Corp., and be based on digital signal-processing (DSP) architectures conceived by Henry Samueli. The author presents a biography of Samueli from his school days through his work in the defense industry and his teaching career to the co- founding of, and work at, Broadcom.

  • A 70 dB MTPR Integrated Programmable Gain/Bandwidth Fourth-Order Chebyshev High-Pass Filter for ADSL/VDSL Receivers in 65 nm CMOS

    This paper presents a fourth-order Chebyshev high-pass filter (HPF) in 65 nm CMOS process with programmable gain and corner frequency to support ADSL and 5/6 band VDSL applications. The HPF improves noise performance by reducing the number of cascaded stages in the receive path and using capacitive feedback to minimize the total number of resistors in the filter. The choice of filter architecture and the optimization of the feedback structure reduce noise for a given total filter capacitance. It achieves a 70 dB MTPR and -161 dBm/Hz (2.8 nV/radicHz ) input-referred noise for ADSL mode. An IM3 of -80 dBc at 10 MHz is measured for VDSL mode. The HPF consumes 236 mW from 2.5 V power supply with active area of 3 mm<sup>2</sup>.

  • Enabling a Platform for Habitat and Marine Assessment with Real Time Monitoring and Synchronous Databasing

    Quality data is important in making estimates of the current state of marine environments. At the Center for Ocean Technology at the University of South Florida, we have developed the Camera Based Assessment Survey System (C-BASS) towbody by combining the ease of off the shelf components with a custom software framework. C-BASS entails the integration of custom software and hardware components, off the shelf instrumentation, and web servers to distribute this data real-time to the user while storing all the parameters vital to the research endeavor.Key choices made during the design phase encompassed three main areas of focus; first and foremost was the ease of use for the operators of C-BASS while ensuring the robustness of the data collected. The topside client interface is based on a RESTful web api interface, creating a familiar environment for users entailing a modern web- browser as the only topside software for operators. The data collection entails a database synchronized to a GPS ship clock, including all towbody video, sensors, and sonar, as well as ship-sourced data such as sonars, positioning, and attitude. Therefore, in analyzing the data complex operations and custom data tables can be created from the relational SQL database. Second, there was a focus on the use of commercial off the shelf hardware components (COTS), software libraries, and applications to speed development. The base communications link was realized with digital subscriber line (DSL) modems over cables as basic as three internal conductors and a conductive outer shielding as a fourth conductor. While limiting the data sent through the uplink, the DSL modems remove the need for fiber optic cables and the operational needs associated them. Thus, the paradigm of a high bandwidth local data collection on the towbody and a low bandwidth real time link for real time monitoring of data quality during deployments, led to the development of a client-server model. Control and monitoring are done on the client side interface, while a small form factor COTS computer running Ubuntu Linux acts as the C-BASS main processor handling the server side backend, requests, and data recording.Last, prioritization was given to the ability for streamlined future enhancements. These enhancements can include additional or better cameras, new sensors, or changes to the user interface (UI). While the use of COTS components eases initial development, it also serves to keep the system in a modular design which assists later modifications. Further, the ability to utilize a wide variety of sensor interfaces allows for these components, and for a client side code display tailored to the user. However, it is in keeping an eye on being easily expandable that led to the design of sensor readers, with much of the code inherited from a generic parent function, along with the separation of such in the software framework from the tasks of data logging and data display in the UI. This paper will discuss the design choices that were made as well as the reasons for our methodology.

  • Joint Transmit Power and Filter Tap Allocation in DMT Transmitters with Per-Tone Pulse Shaping

    Per-tone pulse shaping has been proposed as an alternative to time domain spectral shaping for discrete multi-tone (DMT) transmitters, e.g. VDSL modems. This enables the transmitter to use more tones without violating the power spectral density (PSD) mask constraint for data transmission. The computational complexity of the per-tone pulse shaping and transmit power is evenly distributed over tones, however, resources (computational complexity and power) can be better exploited by using different filter lengths for different tones and by resorting to power loading. For a fixed pulse shaping filter length, the contribution of a particular tone to the stop band energy depends on the power allocated to the tone and on the distance of the tone from the band edges. The use of high order pulse shaping filters for the tones at the band edges (as well as the use of lower power) will reduce their contribution to the out of band PSD, whereas for the tones at the middle of the band these factors will have less effect on the out of band PSD. Therefore, the combination of both power loading and a variable length pulse shaping filter can be used to achieve a high data rate under resource and PSD constraints. In this paper we present an algorithm to optimally allocate the resources i.e. power and filter taps, using a dual problem formulation. This solves the problem of optimally distributing power and filter taps over tones for a given PSD mask constraint, with a relatively low complexity.



Standards related to Subscriber-line Modems

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No standards are currently tagged "Subscriber-line Modems"