Transmission strategies for high-speed access over Category-7A copper wiring

Enteshari, Ali; Kavehrad, M.

doi:10.1109/ccece.2008.4564700

Cited by 8 publications

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“…The cable industry is promoting the use of CAT-7A cable and more convenient CAT-8 cable to support these demanding applications. State-of-the-art digital signal processors (DSP) will be used to cancel impairments in the twisted-pair cable to ensure adequate signal-to-noise ratio (SNR) to achieve a suggested target average bit error rate of 10 -12 at data rates of 40 Gbps and beyond.This paper is basically the continuation of the work presented in [3]. The feasibility of data rates of 40 Gbps and 100 Gbps transmission over CAT-7A copper wire was investigated in [3].…”

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confidence: 98%

“…We show that these rate optimization methods achieve the same bandwidth as they both try to minimize the gap to capacity. The coding gain of about 5 dB which can be obtained by 4 dimensional trellis coded modulation was considered in [3]. In this paper, we consider a worst case scenario for background noise in which the noise from mixed-signal circuits is assumed to be the dominant noise.…”

Section: Introductionmentioning

confidence: 99%

“…The feasibility of data rates of 40 Gbps and 100 Gbps transmission over CAT-7A copper wire was investigated in [3]. This assessment was based on single-input single-output (SISO) capacity analysis, assuming crosstalk signals are adequately attenuated by the corresponding cancellers.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the proper shielding of CAT-7A cable, the alien nearend crosstalk is negligible, although if its power is significant, it can be simply included in our model. Figure 2 shows the insertion loss and return loss measurements of the blue pair (h 1,1 and g 1,1 ) along with the NEXT and FEXT interference signals from the brown pair (h 1,2 and g 1,2 ) as functions of the frequency [3].Although all our results are based on actual measurements and characterization made by Nexans, for interested readers who want to evaluate/duplicate some of the results, we adopted the following equation which can model the insertion loss of a 50 m CAT-7 cable very well up to 3 GHz (f is in MHz in this equation): III. Capacity Bounds…”

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confidence: 99%

“…The communication system, therefore, comprises four transceiver pairs on both ends. The matrices signifying channel responses at time kT and the corresponding tap-voltage vectors have the following relationship as given in [3]:whereis the k-th sample of vector signal, which is the input signal to the channel H(t).is the k-th sample of vector signalwhich is the interfering signal from the near-end transmitters.• H k =H(kT) is the discrete matrix impulse response of the vector channel that describes the signal attenuation (insertion loss) and electromagnetic coupling between the twisted pairs (FEXT) [3].• G k =G(kT) is the discrete matrix impulse response of interfering channels representing return loss (RL) and nearend crosstalk (NEXT). It is assumed that, without loss of generality, all the elements of H (G) have the same channel order n H (n G ), and …”

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confidence: 99%

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High-Speed Access over Copper: Rate Optimization and Signal Construction

Enteshari¹,

Fadlullah²,

Kavehrad³

2009

ETRI J

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This paper focuses on assessment and design of transmission systems for distribution of digital signals over standard Category-7A copper cables at speeds beyond 10 Gbps. The main contribution of this paper is on the technical feasibility and system design for data rates of 40 Gbps and 100 Gbps over copper. Based on capacity analysis and rate optimization algorithms, system parameters are obtained and the design implementation trade-offs are discussed. Our simulation results confirm that with the aid of a decision-feedback equalizer and powerful coding techniques, namely, TCM or LDPC code, 40 Gbps transmission is feasible over 50 m of CAT-7A copper cable. These results also indicate that 100 Gbps transmission can be achieved over 15 m cables. Keywords: 40GBASE-T, single-carrier capacity, SISO, MIMO.Manuscript received Apr. 30, 2009; accepted July 8, 2009. This work was supported by Berk Tek-Nexans, New Holland PA, USA. Ali Enteshari (phone: +1 814 865 0183, email: enteshari@psu.edu), Jarir M. Fadlullah (email: jmf414@psu.edu), and Mohsen Kavehrad (email: mkavehrad@psu.edu) are with the Department of Electrical Engineering, Pennsylvania State University, University Park, PA, USA.doi:10.4218/etrij.09.0109.0231 I. IntroductionIn the commercial market, the extension of fiber into access networks in small businesses and dense metropolitan areas is a new challenge. It has been known for some time that a major bottleneck in delivering multimedia services to computer users is the low-capacity of LANs. With ever-increasing demand for higher capacities, the need for broadband access is transformed from a convenience to a necessity. So far, data communication has been the main driving force behind increased traffic on the communication networks. Applications stemming from a wide range of disciplines, such as high-performance computing, consumer multimedia, teleconferencing, and telemedicine, are just a few examples that require data rates in the gigabits per second range. To keep up with this explosive growth, ultra highcapacity networks were required, and thus optical networks with terabit capacities have dominated the network core. To enable the end user to take full advantage of this core, reliable high-speed LAN access is required. Providing service in a broadband access LAN using a copper cable approach has the advantages of the network being highly-dependable and cost-effective. This will benefit the providers of service over campus settings, such as hospitals, industry compounds, or universities, with facilities spread over several buildings, in that a quick service upgrade could extend new service offerings. Also, within server farms and data centers, short copper connectors are preferable.After the release of 10GBASE-T, which supports data rates of 10 Gbps up to a distance of 100 meters (for connecting work areas to a telecommunications room), many IEEE members recognized the potential for higher speed and are currently thinking of ways to deliver tens of Gigabits per second over copper cables. The 10GBASE-T standa...

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confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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High-Speed Access over Copper: Rate Optimization and Signal Construction

Enteshari¹,

Fadlullah²,

Kavehrad³

2009

ETRI J

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Signal construction for high-speed access over copper wiring

Enteshari

Kavehrad

Fadlullah

2009

2009 Canadian Conference on Electrical and Computer Engineering

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In this paper, we present signal construction for the future IEEE 40GBASE-T standard. The LDPC assisted coded modulation and demodulation is presented. A code achieving 6dB gain, which is literally high enough to satisfy reliability constraints for data transmission at a rate of 40 Gbps over 50m Cat-7A (class FA) copper cable, is designed and the simulation results are presented. The main objective of the presented work is to extensively reduce the power and implementation complexities of a 40GBASE-T system.

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Channel equalization for multi-gigabit ethernet over copper

Fadlullah

Enteshari

Kavehrad

2009

2009 Canadian Conference on Electrical and Computer Engineering

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We present formulations and simulation results for infiniteand finite-length MIMO decision feedback equalization and compare with finite-length SISO equalizer/FEXT canceller for an improved version of Cat-6 cable. Intuitively, far-end crosstalk contains useful information, and instead of being cancelled, could be jointly processed to improve performance. Conversely, a simpler system could be designed for a given transmission rate. A SISO equalizer/canceller is compared with a MIMO equalizer to investigate possible improvement in decision point SNR and filter lengths.Index Terms-Decision feedback equalizers, local area networks, MIMO, wire communication interferences.

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Transmission strategies for high-speed access over Category-7A copper wiring

Cited by 8 publications

References 5 publications

High-Speed Access over Copper: Rate Optimization and Signal Construction

High-Speed Access over Copper: Rate Optimization and Signal Construction

Signal construction for high-speed access over copper wiring

Channel equalization for multi-gigabit ethernet over copper

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