Hi,
all
Since we already have “slot”
as a unit of 48 data subcarrier, it would be better
if we confine the usage of “subchannel”, only to divide
subcarriers in “1-dim” frequency domain.
If not, we still have confusion in using “subchannel
offset” related with this issue.
Then, we need to replace “subchannel” – which is used to represent a group of 48 data subcarrier
in the text – with “slot”.
è Examples: pp. 572 “The subchannel slot is
constructed from 6 uplink tiles”
We also need to replace “slot” – which is
used to represent subcarrier division in “1-dim” frequency domain –
with “subchannel”.
è Examples: pp. 621 “3. Starting Logical Slot Subchannel offset
= 6” (Using subchannel offset value of 6 for initialization vector
of randomizer, we could obtain the exact same result as in the
example. Of course the example is not entirely correct as somebody
already mentioned in the corrigenda group)
If I am wrong, please anyone correct me.
Jungnam
-----Original Message-----
From: owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On
Behalf Of Sean Cai
Sent: Friday, November 05, 2004 9:52 AM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
subchannel is a 1 dimension or 2 dimension allocation unit?
Hongmei,
Can we simply define that
a subchannel unit to be 48 data subcarrier-symbols?
Just think that a
subchannel unit is consisted of 48 data subcarrier-symbols. Therefore, no
matter how you look at it, physically it can be different sizes and shapes. The
smaller number of data subcarriers are defined in a subchannel unit, the more
symbols are grouped (like a “slot”) to come up with the same unit
of 48 data subcarrier-symbols, such as FUSC: (48+pilots)x1, PUSC:
(24+pilots)x2, AMC: (16+pilots)x3, or AMC: (6+pilots)x6, etc. This concept is
applied to both UL and DL. Maybe that is another way to look at your “2
dim” definition.
Regards,
Sean Cai
ZTE
-----Original Message-----
From:
owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org] On
Behalf Of Sun, Hongmei
Sent: Friday, November 05, 2004 1:53 AM
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16] subchannel
is a 1 dimension or 2 dimension allocation unit?
Dear all,
Based
on discussion for AMC permutation and DL PUSC permutation these days, I'd like
to speak out my doubts about the definition of
subchannel in
.16d/.16e Spec. here. Hope to get your opinion about this issue. Thanks~
I just want to confirm the Definition of Subchannel
in spec.
It is a 1 dimension allocation unit or 2
dimension allocation unit on earth? or it depends on different case?
For
example: "Tile" in UL PUSC is a block with size of 4 subcarrier
x 3 symbol, so we can regard it as a 2 dimension allocation unit. And
totally there are 4*3=12 subcarrier per Tile in UL PUSC case. Actually
"12" is some kind of logical number because only 4 physical
subcarriers are allocated here. And also for subchannel in this case
(6 Tiles make 1 subchannel), we say 48 data subcarriers per subchannel,
which is also a kind of logical number, right?
But in
DL FUSC case, seems subchannel is a 1 dimension allocation unit, because it has
48 physical subcarriers per subchannel (without consideration of time domain).
So
totally, we can conclude the definition of subchannel of all cases as below:
DL
FUSC/OFUSC: 1 dim. allocation unit with 48 subcarriers per subchannel
DL
PUSC: 1 dim. concept if say 24 subcarriers or 2 dim. concept if say
48 subcarrier per subchannel
UL
PUSC/OPUSC: 2 dim. allocation unit with totally 48 subcarriers per subchannel
AMC: 2
dim. allocation unit with 48 subcarriers per subchannel
I was
perplexed by this problem for a long time, really hope you can help me to make
this clear.
Thanks
a lot in advance!
Hongmei
SUN