RE: [10GBASE-T] question about the complexity reduction of MIMO
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?
From: P.J. Sallaway [mailto:firstname.lastname@example.org]
Sent: Tuesday, January 21, 2003 10:24 AM
To: William Jones
Cc: email@example.com; firstname.lastname@example.org
Subject: RE: [10GBASE-T] question about the complexity reduction of MIMO
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?
On Mon, 2003-01-20 at 13:44, William Jones wrote:
> 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.
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org]
> Sent: Monday, January 20, 2003 10:24 AM
> To: William Jones
> Cc: email@example.com
> Subject: [10GBASE-T] question about the complexity reduction of MIMO
> 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.
P.J. Sallaway <firstname.lastname@example.org>
Myrica Networks Inc.