User Guide

AB-Access Config & User Guide 5.5 Axxcelera Broadband Wireless
July 27, 2004 Company Confidential Page 27 of 129
5.6 RF Channels spacing and output power
0 5.735 29
1 5.750 29
2 5.765 29
3 5.780 29
4 5.825 29
5 5.840 28
ETSI Out
p
ut Power for AB-Access
5.7 TDD (Time Division Duplex)
The AB-Access system uses TDD (Time Division Duplex) to transfer data across the
wireless link as opposed to FDD (Frequency Division Duplex). The AB-Access implementation of
the TDD architecture allows the TDD frame to dynamically vary in size according to the offered
load: short frames when fewer users are sharing the channel, longer frames when there are many
simultaneous users. The TDD guard time is also adaptive, as it is set to round trip propagation delay
to the farthest SU. TDD has a number of advantages over a FDD system. These include:
Channel Center Freq EIRP
# (GHz) (dBm)
-----------------------------------------------
0* 5.17 19
1* 5.185 19
2* 5.2 19
3* 5.215 19
4* 5.230 19
-----------------------------------------------
55.2726
65.28526
75.326
85.31526
95.3326
-----------------------------------------------
10 5.745 32
11 5.76 32
12 5.775 32
13 5.79 32
14 5.805 32
15 5.820 32
16 5.835 32
-18.5dB
-18.5dB
Low Band * Indoor Only
Middle Band
UNII & ISM Frequency Spacing
for AB-Access 5-6GHz
Band Edge
Guard
5.7605.745 5.775 5.790 5.805
5.8505.725
5.820 5.835
-18.5dB
High Band
5.35
5.25
5.2855.27 5.3 5.315 5.33
5.1855.17 5.2 5.215 5.230
5.25
5.15