User's Manual Chapter 13

Table Of Contents

Base FCC Regulatory Test Report

7-96

AT&T Wireless Services

FCC Type Acceptance Application

10991 Rev. 1.0 7/6/99

Figure 7.10—PWAN Subband Allocation

The PWAN utilizes a total of 320 OFDM tones per 1 MHz subband on

both the downlink and uplink. Of the 320 available tones, 16 clusters of

18 tones each are allocated in the frequency-domain as airlink

Frequency Division Multiple Access (FDMA) slots (refer to

Figure 7.11—). Each FDMA slot is delineated by the presence of a

synchronization pilot tone on each side of the slot, bringing the total

number of energized tones to 305. The remaining 15 OFDM tones in

the 320-tone suite are not energized; they represent the first seven tones

at the low frequency end of subband and eight tones at the high end.

The allocation of tones is identical between the uplink and downlink.

Figure 7.11—PWAN FDMA Structure

5 MHz PCS Block

1 MHz

500 kHz

Guardband

500 kHz

Guardband

Subband A

Subband B

Subband C

Subband D

Lower Band

1 MHz

Upper Band

1 MHz

80 MHz

Base Tx Band 1MHz

Base Rx Band 1MHz

320 Tone Bins

base

Tch

NAC

Tch

7 8

Pilot

1/burst period (s)

Traffic Bearer Tones