Channel gain change detection and channel profile selection in a multicarrier system

Salvekar, A.A.; Aldana, C.; Tellado, J.; Cioffi, J.M.

doi:10.1109/glocom.1999.829950

Cited by 2 publications

(3 citation statements)

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“…In addition to the presence of crosstalkers, in some DSL systems, the user of interest's channel can change in a deterministic way. For instance in splitterless ADSL, when a phone goes on-hook/off-hook, the channel characteristics change in a welldefined manner [12]. This deterministic channel gain change can also be included in the channel profile definition.…”

Section: Channel Profilesmentioning

confidence: 99%

“…Once the state of the system is ascertained, then the corresponding transmission parameters can be loaded. To determine the system's state, we describe the general profile detection problem, first studied in [12], [13]. Consider a block of sampled output data where is the th sample of the output, is the block size, and represents transpose.…”

Section: Channel Profilesmentioning

confidence: 99%

“…In bandlimiting case 1), ignoring the effects of the synchronization sequences, is not a function of since the autocorrelation is not a function of , as shown in Appendix A. The bandlimited GML detector becomes (12) where is given by (10) when there is no known sequence. We shall call this bandlimited maximum likelihood detection (BMLD).…”

Section: A Bandlimited Maximum Likelihood Detectionmentioning

confidence: 99%

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Profile detection in multiuser digital subscriber line systems

Salvekar

Louveaux

Aldana

et al. 2002

IEEE J. Select. Areas Commun.

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Multiuser transmission methods for digital subscriber line (DSL) systems have become of interest with the potential for increased data rate and loop reach. These methods often assume that the set of crosstalk interferers, called the crosstalk profile, and their associated channel responses are known. For DSL systems, the interferers are often uncoordinated, so that in a dynamic environment where DSL transmitters can energize and deenergize, the crosstalk profile cannot be transmitted to the user of interest. While the crosstalk channel estimation problem in a dynamic environment can be intractable for general transmission systems, channel and crosstalk analysis can make use of the specific DSL environment. Namely, the physical channels in a DSL system do not change rapidly, and hence estimates of the crosstalk channel can be saved for future reference. For this reason, we introduce the concept of a channel profile. We develop several algorithms to detect the crosstalk profile and investigate the asymptotic behavior of the new algorithms. Simulations show that for typical crosstalk interference scenarios, the observation time to determine the correct crosstalk profile at probability of error less than 10 3 can be less than 2 ms.

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Section: Channel Profilesmentioning

confidence: 99%

Section: Channel Profilesmentioning

confidence: 99%

Section: A Bandlimited Maximum Likelihood Detectionmentioning

confidence: 99%

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