K. W. Cheong, J. M. Cioffi, "Coexistence of 1 Mbps HPNA and DMT VDSL via Multiuser Detection and Code Division Multiplexing," TIE1.4/99-120, March 8, 1999.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....cases of DSL application, where coexists asymmetric and symmetric services. A proposed multiuser channel model has been derived, and the enhancement on the DMT ADSL receiver is introduced to mitigate crosstalk from the SDSL services. Some important simplification algorithms, such as tone zeroing [14], and multi stage joint maximum likelihood detection for multiuser DMT ADSL are derived, which can largely reduce the multiuser DMT ADSL receiver complexity. Our proposed sub optimal approach, multi stage JMLSE with feedback section has a reasonable computational complexity, and also improves ....

....when the interference structure is taken into account. 55 C, Blog[l P ] riB] 5.1.2.13) User C2 C2 Rate Figure 5.1.2.3: Channel Capacity Single vs. Multiuser Channels An alternate, we can derive the same conclusion of a better performance in multiuser DMT ADSL model using [14]. As shown in Fig. 5.1.1, the signal y represents the sum of all the data signals and R is the signal at the ADSL receiver. The mutual information I(x, y) cannot exceed the mutual information between the aggregate data signal R and the channel output y, I(R, y) 58] 59] Also, if each user has ....

K. W. Cheong, J. M. Cioffi, "Coexistence of 1 Mbps HPNA and DMT VDSL via Multiuser Detection and Code Division Multiplexing," TIE1.4/99-120, March 8, 1999.

....Thus, the interference between VDSL and HPL seemed a good first candidate for multiuser detection, although by no means is it the only situation in which benefit could be derived. Thus, some earlier work has investigated this specific area of multiuser detection in contribution T1E1.4 99 120 [2]. Temporary Document T1E1.4 99 120 addresses crosstalk between 1 Mbps Home PNA systems [3] and VDSL. This current contribution provides updated information for future higher speed HPL transmission systems that transmit from 2 10 Mbps in the same band. The second generation HPL system tested used ....

....of early deployed Home PNA have unusually inefficient use of spectrum, thus actually detracting more from a multiuser detection system than a higher speed system using more efficient modulation methods, like QAM, even if the PPM is lower speed. This document provides graphs similar to Figure 5 of [2] for the HPL in Section 2. Further, Section 3 suggests discusses graceful trade of complexity for performance improvement through both tone zeroing and iterative decoding concepts. The proposed sub issue of VDSL scalability is investigated within this context to motivate a graceful trade off ....

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K. Cheong and J. Cioffi, "Coexistence of 1 Mbps HPNA and DMT VDSL via Multiuser Detection and Code-Division Access," ANSI Contribution T1E1.4/99-120, Costa Mesa, CA, March 8, 1999.

....U. Stanford, CA 94305 cioffi stanford.edu , 1 650 723 2150, F: 1 650 723 8473 Thanks to co source research supporters: AMD, GTE (GS) IBM, Intel, Samsung AIT, SK Telecom, and TI Date: August 23, 1999 Dist n: T1E1.4 Abstract: Previous contributions [1] [2] have reported on the performance of a maximum likelihood based joint detection of VDSL signals and Home LAN signals that share the frequency band between 5 and 10 MHz. The methods described were promising in that they show it is possible to mitigate the effect of a Home LAN signal on VDSL almost ....

....depends on H and can lead to computational requirements that are on the order of the complexity of the FFT in practice. More precise calculation of compexity is highly vendor algorithm dependent, but basically this technique is in the range of immediate practice for VDSL, unlike the ML methods in [2] that were used to justify and motivate the search for suboptimum methods as studied here. 4. Conclusion QAM Home LAN signals and DMT VDSL signals are fundamentally separable with little loss in VDSL performance. Iterative decoding methods for the simultaneous detection of both signals where ....

K.W. Cheong and J. Cioffi, "Coexistence of 1 Mbps HPNA and DMT VDSL via Multiuser Detection and Code Division Multiple Access," ITU SG15/Q4 Contribution MA-033, Melbourne, Australia, March 31, 1999.

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