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*To*: "P.J. Sallaway" <pj@myricanetworks.com>*Subject*: RE: [10GBASE-T] question about the complexity reduction of MIMO*From*: "William Jones" <wjones@solarflare.com>*Date*: Tue, 21 Jan 2003 19:10:01 -0800*Cc*: <xichen@marvell.com>, <stds-802-3-10gbt@ieee.org>*Sender*: owner-stds-802-3-10gbt@majordomo.ieee.org*Thread-Index*: AcLBekeoFHT27WRQQi2KHI4/8qzG/QANl3qA*Thread-Topic*: [10GBASE-T] question about the complexity reduction of MIMO

PJ, Answering your question first, the metric used in the tutorial was operations/second. Regarding your comment, I agree that the complexity of a realization is a concern for the group, but, not the realization itself. This distinction avoids excessive consideration for vendor dependent issues which was what I was trying to get at. So, I think it is not whether MIMO can achieve a 4x or 16x reduction, but rather, that there exists at least one possible realization of a particular technology that can achieve an acceptable level of complexity. In the tutorial, we made the comparison to a multi-port 1000BASE-T part. One can then argue feasibility by extension to a realized solution. This leads to a question for the group. What strategy or steps are needed to get to an agreement on technical feasibility? Bill -----Original Message----- From: P.J. Sallaway [mailto:pj@myricanetworks.com] Sent: Tuesday, January 21, 2003 10:24 AM To: William Jones Cc: xichen@marvell.com; stds-802-3-10gbt@ieee.org Subject: RE: [10GBASE-T] question about the complexity reduction of MIMO Bill, I believe the complexity of a practical realization is important to the group as we look at the feasibility of 10 gigabits/second over Cat-5 and the role that different line codes play. I am curious as to what complexity measure you are using when discussing the 16x reduction using MIMO. Is it power dissipation for a given technology? Multiplies per second? Gate count? Thanks, ...PJ On Mon, 2003-01-20 at 13:44, William Jones wrote: > Xiaopeng > > I would claim the maximum is a 16x reduction. So, a practical realization is in the range 4x to 16x. Our approach is somewhere around 7x. Note, a MIMO realization is not unique. But, this is not a concern for the study group. > > Bill > > -----Original Message----- > From: xichen@marvell.com [mailto:xichen@marvell.com] > Sent: Monday, January 20, 2003 10:24 AM > To: William Jones > Cc: stds-802-3-10gbt@ieee.org > Subject: [10GBASE-T] question about the complexity reduction of MIMO > > > > Bill, > > I have a quick question about MIMO. In your presentation, you stated that > the MIMO architecture can help to reduce the DSP complexity from 10 to 1.5. > > For a 4x4 MIMO system, the maximum complexity reduction is 4 times if I am > not wrong. In this extreme case, a one-channel DSP engine can be reused > for 4 channels without any modification. However even in such a case, the > DSP complexity is still 2.5. > > Xiaopeng > > -- P.J. Sallaway <pj@myricanetworks.com> Myrica Networks Inc.

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