Hi Hongemi,
In tables 308b/c/d there is a mistake in the description, it
should have been as in table
308 in the 802.16d: "
Number of data subcarriers in each symbol per subchannel"
which has no ambiguity.
48 subcarriers in a sunchannel, but for PUSC there are 24
subcarriers allocated per OFDMA symbol
(over 2 symbols gives you 48).
Regards,
Yossi
From:
owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On Behalf Of Sun, Hongmei
Sent: Thursday, November 04,
2004 11:43 AM
To:
STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
Regarding Band AMC--Mapping
Dear Panyuh Joo:
Thank
you so much for you reply. For AMC, I think I'm quite clear now.
For DL
PUSC, I think I can understand your meaning, but I do think description of
Spec is confusing.
For
example, in Table 308b, Table 308c and Table 308d of 802.16e/D4 (page
145~146),
there is
one row: "Number of carriers per subchannel: 24 "
So
doesn't that mean in DL PUSC, the each subchannel is composed of 24
subcarrier ?
But in
the other hand, in DL PUSC, 2 cluster makes 1 subchannel, but 1 cluster=12
subcarrier X 2 sym, right,
so from
this point, 1 subchannel has 48 subcarrier totally.
No
matter what this makes reader confusing at its first reading.
I think
the spec doesn't not explicitly seperate these 2 cases, whether the
subcarrier is counted focusing on freq. domain only, or countered
by taking both time domain and freq. domain altogether.
Hongmei
SUN
From:
owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On Behalf Of Panyuh Joo
Sent: Wednesday, November 03,
2004 4:15 PM
To:
STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
Regarding Band AMC--Mapping
Dear Hongmei Sun,
The reason of the following description
exist is for easier understanding the concept to the band.
“AMC subchannel consists of 6 contiguous bins in a same band."
And because the statement does not restrict
the use of 6 contiguous bins within one symbol, one may use 4 bin in first
symbol and the other 2 bin in the second symbol. If someone uses the
abbreviation on this structure as “4:2”
structures of AMC subchannel. Then the possible alternate definition of the
AMC subchannel could be 4:2 or 3:3 or 2:4 or 1:1:1:1:1:1. etc.
Maybe the word “contiguous”
give some wrong sense of instincts. If just forget the nuance of the word
“contiguous” as continuous in frequency domain, just read it as
Contiguous bin in Band. Then we may bend the thoughts as well as the words.
And also please just do not confuse by the
concept of the Band. It just gives you the concept of the AMC
subchannelization. And it is not used for BAND AMC MAPPIING procedure by
itself. The mapping of the data PDU is aligned only with definition of
subchannel.
I still do not see any mis-description in
the original statement in the specs.
And regarding to the DL PUSC, I think there
are some mis-understanding when you read the spec., it would be appreciated if
you can revisit the spec and read it carefully. I will do it too. If I found
the same problems, I will comeback with the answer. But currently, I do not
found any fault in the spec.
Hope this may help U.
Panyuh Joo
From: owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On Behalf Of Sun, Hongmei
Sent: Wednesday, November 03, 2004 4:07 PM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16] Regarding Band AMC--Mapping
Panyuh,
sorry,
but I'm still confused about this even after your explanation.
As you said,
4 Bins make one Band, and 6 Bins make one subchannel. So doesn't this
hint that each AMC subchannel must exist across Band? (My
understanding is: for each subchannel: 4 bins are from 1st Band, the
other 2 bins are from 2nd Band. Of course, these 6 bins are contiguous.)
In
addition,from my understanding, maybe PUSC DL permutation scheme is an
exception case in aspect of subchannel size, where each subchannel has
24 tones but not 48 tones.
Pls
feel free to revise me if my understanding is not right.
Hongmei
SUN
CTL,
Intel
From: owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On Behalf Of Panyuh Joo
Sent: Wednesday, November 03, 2004 2:31 PM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16] Regarding Band AMC--Mapping
Hi,
Varma and All,
Because
one Band only got 4bins and 4 Bin only can make 32 data subcarriers + 4 pilot
subcarriers. Any subchannel shoud have at least 48 tones(subcarriers),
if we do not restrict the definition of AMC subchannel into
one band. than any AMC subchannel can be exist accross the Band.
So,
the meaning of "AMC subchannel consists
of 6 contiguous bins in a same band"
==> one AMC subchannel should be confined with in the same band. This
definition would help the system exploits the Multi user diversity.
I hope this explanation would help you.
Panyuh Joo
|
--------
|
Panyuh Joo Ph.D.
Global Standards & Research Team
Telecommunication
R&D
Center
Telecommunication Network
SAMSUNG ELECTRONICS CO., LTD
TEL: 82-31-279-5096
FAX: 82-31-279-5130
Mobile :
82-16-9530-5096
panyuh@samsung.com
|
------- Original
Message -------
Sender : varma
indukuri<varma.ivs@gmail.com>
Date : 2004-11-03
14:46
Title : [STDS-802-16]
Regarding Band AMC--Mapping
Hi all,
Section8.4.6.3(P80216-REVd_D5):: Optional permutations for AAS and AMC
subchannels.
A bin was defined as the set of adjacent 9 subcarriers with pilot in
the middle as in Fig:238. But I couldn't understand the meaning of
"A group of 4 rows of bins is called a band. AMC subchannel consists
of 6 contiguous bins in a same band."?????
Can any one help me in this regard.
Regards
varma ivs
|