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Re: stds-80220-requirements: Antenna Diversity Requirement, 4.1.1 2



Title: RE: stds-80220-requirements: Antenna Diversity Requirement, 4.1.12
Joseph, while a 2x2 antenna configuration with Alamouti coding may be a good design point, we would want to avoid that type of specification unless it could be reasonably shown that this was the only antenna configuration that could lead to a useful solution set. 
 
Generally, we must all be on our guard to specify requirements that are as independent of implementations as possible.  Let's try to stick with the application requirements and then test our proposed solutions against these requirements.
 
Best regards,
 
Robert D. Love
President, LAN Connect Consultants
7105 Leveret Circle     Raleigh, NC 27615
Phone: 919 848-6773       Mobile: 919 810-7816
email: rdlove@ieee.org          Fax: 208 978-1187
----- Original Message -----
Sent: Friday, August 08, 2003 4:17 PM
Subject: RE: stds-80220-requirements: Antenna Diversity Requirement, 4.1.1 2

Hi Khurram and Shigeru,

I agree with Joanne regarding a requirement that terminals support diversity: diversity antennas should not be a mandatory requirement.  What I suggest is that if antenna diversity in the terminal is provided, then specific performance and/or processing requirements shall be met.  An example is 2x2 antenna configuration with Alamouti coding. 

Joseph Cleveland

-----Original Message-----
From: Joanne Wilson [mailto:joanne@arraycomm.com]
Sent: Friday, August 08, 2003 2:25 PM
To: Sheikh, Khurram P [GMG]; shigeru kimura; 802-20 IEEE requirements list
Subject: RE: stds-80220-requirements: Antenna Diversity Requirement, 4.1.12



Dear Khurram,

I don't understand your argument for requiring that 802.20 terminals have antenna diversity.  As you stated, existing systems have these capabilities in the pipeline.  Therefore, in the future there will be mobile terminals with and without antenna diversity.  I don't believe that existing systems will stop supporting terminals with a single antenna.  As you know, market needs vary for many reasons in different places and with different market segments, often requiring tradeoffs between performance, cost and other factors like terminal size.  I believe what Kimura-san is proposing is that 802.20 support having terminals with multiple antennas, but that terminals with single antennas would also be allowed.  This seems extremely reasonable and it should be in both the operators' and the consumers' interest.  I also support Samir's proposal to use the term "multi-antenna processing" instead of antenna diversity as it is broader in scope.

Best regards,

Joanne Wilson
ArrayComm, Inc.
joanne@arraycomm.com


-----Original Message-----
From: owner-stds-80220-requirements@majordomo.ieee.org
[mailto:owner-stds-80220-requirements@majordomo.ieee.org]On Behalf Of Sheikh, Khurram P [GMG]
Sent: Friday, August 08, 2003 12:19 AM
To: shigeru kimura; 802-20 IEEE requirements list
Subject: RE: stds-80220-requirements: Antenna Diversity Requirement, 4.1.12




Dear Mr. Kimura

I have to disagree with your notion of not putting a minimum requirement on antenna diversity. Current generation systems have these capabilities in the pipeline, so it seems very illogical not to shoot for higher performance by putting at least a minimum requirement for antenna diversity.

Bets Regards


Khurram P. Sheikh
Chief Technology Advisor
Sprint- Broadband Wireless
Tel (SM): 650-513-2056
Tel(KC): 913-762-1645
Mobile: 650-906-8989
khurram.p.sheikh@mail.sprint.com


-----Original Message-----
From: shigeru kimura [mailto:shigeru_kimura@csg.kyocera.co.jp]
Sent: Thursday, August 07, 2003 10:23 PM
To: 802-20 IEEE requirements list
Cc: Shigeru_Kimura@csg.kyocera.co.jp
Subject: stds-80220-requirements: Antenna Diversity Requirement, 4.1.12


Dear ALL

  This is Shigeru Kimura.


  I want to propose to remove the section 4.1.12 of Rev 5.





  Section 4.1.12 - Antenna Diversity


  Current text

  At a minimum, both the Base Station and the Mobile Terminal shall
  provide two element diversity. Diversity may be an integral part of
  an advanced antenna solution.
  Proposed New text
  N/A(Delete section)


  Rationale

  Support for multiple antenna capability is described section 4.1.11.
  Section 4.1.12 defines a minimum antenna number for
  Base Station and Mobile Terminal.
  There is a contradiction between 4.1.11 and 4.1.12.
  Only  section  4.1.11  description is enough for multiple antenna capability I
  think.
  And the antenna number of Mobile Terminal should not be defined in the
  Requirements Document.
  The important thing is the system performance with cost.

  Thank you.

               Kimura