[STDS-802-16] Sub-carrier spacing calculation in 802.16
Greetings,
Regarding the carrier spacing, it is desired, and technically
feasible, to have a single carrier spacing across all bandwidths
(1.25MHz, 2.5MHz, 5MHz, 10MHz and 20MHz) for the ease of
inter-operability among different networks. However, when
using the formula provided in IEEE802.16d (section 8.4.2.4),
it turns out that the carrier spacing is different, depending
on the bandwidth:
Band width Sub-carrier spacing
------------------------------------------------
1.25MHz 11125Hz
2.5MHz 11156.25Hz
5MHz 11156.25Hz
10MHz 11156.25Hz
20MHz 11160.1563Hz
It is evident that only bandwidth 2.5MHz, 5MHz and 10MHz
have the same carrier spacing (11.15625kHz).
The question is why the 1.25MHz and 20MHz are excluded
from the scope of this inter-operability(same carrier spacing),
or the formula for the carrier spacing calculation should be
interpreted differently ?
Best regards
Herbert Ruck
Cell: 817-235-9599
hruck@navini.com; herbert.ruck@ieee.org