1. April 2009
doc.: IEEE /xxxxr0
March 2011
IEEE TGaf Resolution of PHY CID’s on adjacent channel center frequency
Date:
Authors:
Krishna Sankar M, Broadcom
xxx, yyy

2. March 2011
Abstract
The presentation address the following CID’s from Letter Ballot 171 in TGaf Draft 1.0
Adjacent channel center frequency is not well defined
CID154, CID263, CID1193, CID1259, CID1260, CID791, CID792
Non adjacent channel center frequency is not well defined
CID870, CID155, CID264, CID1194, CID1261, CID1262, CID793, CID794
Bandwidth of the ACI signal is not specified
CID156, CID871, CID1195
Krishna Sankar M, Broadcom

3. Center frequency of adjacent channel
March 2011
Center frequency of adjacent channel
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
154
82.00
The actual adjacent channel center frequency is not specified for TVWS band operation, making spec compliance dependent on the regulatory domain (and open to interpretation). The intention may be to mirror the distinction between testing systems for 2.4 GHz and 5 GHz operation based on the center frequency spacing being different in the two bands, but the wording seems needlessly imprecise.
change lines "In the TVWS band, the adjacent channel center frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the adjacent channel center frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated by 20 MHz, 10 MHz or 5 MHz, respectively, or the nearest greater value possible according to the channel spacing defined by the regulatory authority." Also change lines from "In the TVWS band, the adjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the adjacent channel center frequencies shall be separated by 40 MHz or the nearest greater value possible according to the channel spacing defined by the regulatory authority."
Agree in principle
(duplicate of CID1193)
Krishna Sankar M, Broadcom

4. Center frequency of adjacent channel (cont)
March 2011
Center frequency of adjacent channel (cont)
CID
Clause
Comment
Proposed Change
Proposed Resolution
263
The specification for adjacent channel center frequency is vague: "In the TVWS band, the adjacent channel center frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority. Given that the TVWS band has a channel spacing of 6MHz, the spec as of now, is specifying an adjacent channel 6MHz away for all possible transmission bandwidths. Its not desirable and can potentially constraints implementation choices.
For each transmission signal band width, keep the adjacent channel center frequency to be at least away by the signal bandwidth. Change "In the TVWS band, the adjacent channel center frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the adjacent channel center frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated by at least 20MHz/ 10MHz/ 5MHz respectively away and in accordance to the channel spacing defined by the regulatory authority." For 40MHz case Change "In the TVWS band, the adjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the adjacent channel center frequencies shall be separated by at least 40MHz away and in accordance to the channel spacing defined by the regulatory authority."
Agree in principle
Krishna Sankar M, Broadcom

5. Center frequency of adjacent channel (cont)
March 2011
Center frequency of adjacent channel (cont)
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
1259
82.14
Ambiguous description of adjacent channel separation
Agree in principle
1260
82.25
791
82.13
the "regulatory authority" probably allows 100s of MHz separation.
I think this should be modified to "the minimum channel spacing"
792
82.26
Krishna Sankar M, Broadcom

6. Proposed Resolution Proposed Resolution : Agree in Principle
March 2011
Proposed Resolution
Proposed Resolution : Agree in Principle
Instruction to Editor: In Section Adjacent channel rejection, page 82, lines 13-16, please modify the text as follows:
In the TVWS band, the adjacent channel center frequencies for
transmission in W MHz channel width (where W is 40, 20, 10, 5)
20 MHz / 10 MHz / 5 MHz shall be separated by
according to the where is the minimum channel spacing defined by the regulatory authority.
is the smallest integer greater than or equal to .
Krishna Sankar M, Broadcom

7. March 2011
Proposed Resolution
Instruction to Editor: In Section Adjacent channel rejection, page 82, lines 25-27, please delete the text as follows:
In the TVWS band, the adjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority.
Krishna Sankar M, Broadcom

8. Non adjacent channel center frequency
March 2011
Non adjacent channel center frequency
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
870
82.41
The actual adjacent channel center frequency is not specified for nonadjacent channel rejection, making spec compliance dependent on the regulatory domain. The description should be more precise.
Change lines "In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated by 40 MHz / 20 MHz / 10 MHz respectively or the nearest greater value possible according to the channel spacing defined by the regulatory authority." Also change lines "In the TVWS band, the nonadjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the nonadjacent channel center frequencies shall be separated by 80 MHz or the nearest greater value posible according to the channel spacing defined by the regulatory authority."
Agree in principle
(duplicate of CID155)
Krishna Sankar M, Broadcom

9. Non adjacent channel center frequency (cont)
April 2009
doc.: IEEE /xxxxr0
March 2011
Non adjacent channel center frequency (cont)
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
264
82.42
The specification for non adjacent channel center frequency is vague: - The spec points to FCC ruling for adjacent channel definition. However, FCC ruling does not provide a definition of adjacent channel. "In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority." FCC ruling does not strictly mention a non-adjacent channel.
Change ""In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated by at least 40MHz/20MHz/10MHz respectively and in accordance to the channel spacing defined by the regulatory authority." For 40MHz case, Change "In the TVWS band, the nonadjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the nonadjacent channel center frequencies shall be separated by atleast 80MHz away and in accordance to the channel spacing defined by the regulatory authority."
Agree in principle
Krishna Sankar M, Broadcom
xxx, yyy

10. Non adjacent channel center frequency (cont)
March 2011
Non adjacent channel center frequency (cont)
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
1194
82.00
same as previous comment, only concerned with the nonadjacent channel rejection
Change lines "In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the nonadjacent channel frequencies for 20 MHz / 10 MHz / 5 MHz shall be separated by 40 MHz / 20 MHz / 10 MHz respectively or the nearest greater value possible according to the channel spacing defined by the regulatory authority." Also change lines "In the TVWS band, the nonadjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority." to "In the TVWS band, the nonadjacent channel center frequencies shall be separated by 80 MHz or the nearest greater value posible according to the channel spacing defined by the regulatory authority."
Agree in principle
Krishna Sankar M, Broadcom

11. Non adjacent channel center frequency (cont)
March 2011
Non adjacent channel center frequency (cont)
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
1261
82.41
Ambiguous description of nonadjacent channel separation
Agree in principle
1262
82.54
793
82.42
the "regulatory authority" probably allows 100s of MHz separation.
I think this should be modified to "the minimum channel spacing plus one channel"
794
82.55
Krishna Sankar M, Broadcom

12. Proposed Resolution Proposed Resolution : Agree in Principle
March 2011
Proposed Resolution
Proposed Resolution : Agree in Principle
Instruction to Editor: In Section Non Adjacent channel rejection, page 82, lines 41-44, please modify the text as follows:
In the TVWS band, the nonadjacent channel center frequencies for
transmission in W MHz channel width (where W is 40, 20, 10, 5)
20 MHz / 10 MHz / 5 MHz shall be separated by
according to the where is the minimum channel spacing defined by the regulatory authority.
is the smallest integer greater than or equal to .
Krishna Sankar M, Broadcom

13. March 2011
Proposed Resolution
Instruction to Editor: In Section Nonadjacent channel rejection, page 82, lines please delete the text as follows :
In the TVWS band, the nonadjacent channel center frequencies shall be separated according to the channel spacing defined by the regulatory authority.
Krishna Sankar M, Broadcom

14. Bandwidth of ACI signal
March 2011
Bandwidth of ACI signal
CID
Page
Clause
Comment
Proposed Change
Proposed Resolution
156
82.00
The bandwith of the interfering signal is not specified. The approach of specifying the bandwith seems cleaner, be it as a parameter "W" or by spelling it out, and less open to interpretation.
Either add another sentence specifying the interference in 20 MHz / 10 MHz / 5 MHz terms (and 40 MHz), or introduce the signal bandwidth W and rewrite the previous change and add specification of interfering signal using W
Accept in principle
871
82.41
The nonadjacent channel rejection is not specified. The definition should specify the bandwith. It could be as a parameter "W" or by spelling it out. This would make it less open to interpretation.
Add another sentence specifying the interference in 20 MHz / 10 MHz / 5 MHz terms (and 40 MHz), or introduce the signal bandwidth W and rewrite the previous clause and add specification of interfering signal using W
1195
Krishna Sankar M, Broadcom

15. Proposed Resolution March 2011
Instruction to Editor: In Section Adjacent channel rejection, page 1296, lines please modify the text as follows (Reference to TGmb Draft 6.05) :
The interfering signal in the adjacent channel shall be a conformant OFDM signal, having the same bandwidth as the signal in the channel under test and unsynchronized with the signal in the channel under test.
Instruction to Editor: In section Nonadjacent channel rejection, page 1297, line 15-20, please modify the text as follows (Reference to TGmb Draft 6.05) :
The interfering signal in the nonadjacent channel shall be a conformant OFDM signal, having the same bandwidth as the signal in the channel under test and unsynchronized with the signal in the channel under test.
Krishna Sankar M, Broadcom