MKG-16487 Ver. 5.0

9

Qualcomm Atheros, Inc.

MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION

AR4100 System in Package 802.11n– General Availability Data Sheet

Features Summary

2.9 802.11n

The AR4100 incorporates the latest generation of 802.11n technology from Qualcomm Atheros.

The AR4100 is 802.11n compliant and features frame aggregation, reduced inter-frame spacing

(RIFS) and half guard intervals for improved throughput and space time block codes (STBC) on

downlink receptions and Low Density Parity Check (LDPC) codes on uplink transmissions for

improved robustness over range. Table 2-1 shows 802.11n (PHY layer) throughput at different

modulations.

The AR4100 features hardware-based AES, AES-CCMP, and TKIP engines for faster data

encryption, and supports industry leading security features including WPS 2.0, along with

standard WEP/WPA/WPA2 for personal environments.

2.10 Host Offloading (WiFi)

The AR4100 integrates extensive hardware signal processing and an embedded on-chip CPU to

offload complete 11n MAC/BB/PHY processing to minimize host processor loading.

The AR4100 offloads the complete 802.11 b/g/n baseband and MAC functions as a standard

feature, including:



Link maintenance



802.11 frame transmission sequence to initiate the connection with an AP



Background scanning, including transmission of probe requests



Signal quality detection and automated maintenance of current AP list



Roaming to a new AP



Rate adaptation, including automatic retry



Encapsulation of 802.3 frames from the host to 802.11 frames



Decapsulation of the 802.11 frames to 802.3 frames



Encryption & decryption (hardware ciphers) for WEP/TKIP/AES-CCMP



IEEE PowerSave; periodic wakeup while in sleep mode to check for buffered traffic



Security negotiation



WiFi Protected Setup (WPS) 2.0

Table 2-1

802.11n (PHY layer) Throughput at Different Modulations

MCS

Modulation

Data Rate (Mbps)

20 MHz Bandwidth

Full Guard Interval

Half Guard Interval

0

BPSK

6.5

7.2

1

QPSK

13.0

14.4

2

QPSK

19.5

21.7

3

16-QAM

26.0

29.9

4

16-QAM

39.0

43.3

5

64-QAM

52.0

57.8

6

64-QAM

58.5

65.0

7

64-QAM

65.0

72.2