Добавил:
Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Литература / 802.16-2001+.pdf
Скачиваний:
25
Добавлен:
16.04.2013
Размер:
2.61 Mб
Скачать

AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

Table 109 illustrates the format of the Uplink_Burst_Profile, which is encoded with a Type of 1.

Table 109—Uplink_Burst_Profile format

Syntax

Size

Notes

 

 

 

Type=1

8 bits

 

 

 

 

Length

Variable

 

 

 

 

reserved

4 bits

shall be set to zero

 

 

 

UIUC

4 bits

 

 

 

 

TLV encoded information

Variable

TLV specific

 

 

 

Within each Uplink_Burst_Profile is an unordered list of PHY attributes, encoded as TLV values (see 11.1.1.2).

8.2.6.2 Uplink transmission CS

The uplink transmission CS operation shall be identical to the downlink transmission CS operation, as described in 8.2.5.3.

8.2.6.3 Uplink PHY medium dependent sublayer

The uplink PHY coding and modulation are summarized in the block diagram shown in Figure 124.

Data

Randomization

 

 

FEC

 

 

Preamble

 

 

Symbol

 

 

Baseband

 

 

Modulator

To RF

 

 

 

 

 

 

 

 

 

 

Channel

 

 

 

Encoder

 

 

Prepend

 

 

Mapper

 

 

Pulse

 

 

and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shaping

 

 

Physical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Interface

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Subscriber Station

From RF

Physical

 

 

Matched

 

 

Symbol

 

 

FEC

 

 

De-Randomization

Data

Channel

Interface

 

 

Filter

 

 

Demapper

 

 

Decoder

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Burst Demod

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Base Station

Figure 124—Conceptual block diagram of the uplink PHY

8.2.6.3.1 Randomization for spectrum shaping

The uplink modulator shall implement a randomizer using the polynomial x15+x14+1 with the 15-bit programmable Scrambler Seed. At the beginning of each burst, the register is cleared and the Scrambler Seed value is loaded. The Scrambler Seed value shall be used to calculate the scrambler bit, which is combined in

Copyright © 2002 IEEE. All rights reserved.

251

Соседние файлы в папке Литература