RTL8821AE Combo module User Manual
Single-Chip 802.11b/g/n/ac 1T1R WLAN Controller
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Track ID: JATR-3375-16 Rev. 0.1
1. General Description
The Realtek RTL8821AE is a highly integrated single-chip 802.11b/g/n/ac 1T1R WLAN PCI Express
network interface controller with integrated Bluetooth 2.1/3/0/4.0 USB interface controller. It combines a
WLAN MAC, a 1T1R capable WLAN baseband, BT Protocol Stack (LM, LL, and LE), BT Baseband,
modem, and WLAN/BT RF in a single chip. The RTL8821AE provides a complete solution for a high
throughput performance integrated wireless LAN and Bluetooth device.
The RTL8821AE WLAN baseband implements Orthogonal Frequency Division Multiplexing (OFDM)
with 1 transmit and 1 receive path and is compatible with the 802.11ac specification. Features include one
spatial stream transmission, short guard interval (GI) of 400ns, spatial spreading, and transmission over
20MHz , 40MHz and 80MHz channel bandwidth.
For legacy compatibility, Direct Sequence Spread Spectrum (DSSS), Complementary Code Keying (CCK)
and OFDM baseband processing are included to support all 802.11b and 802.11g data rates. Differential
phase shift keying modulation schemes, DBPSK and DQPSK with data scrambling capability, are available,
and CCK provides support for legacy data rates, with long or short preamble. The high-speed FFT/IFFT
paths, combined with BPSK, QPSK, 16QAM, 64QAM and 256-QAM modulation of the individual
subcarriers and rate compatible punctured convolutional coding with coding rate of 1/2, 2/3, 3/4, and 5/6,
provide up to 433.3Mbps for 802.11ac OFDM.
A RTL8821AE built-in enhanced signal detector, adaptive frequency domain equalizer, and a soft-decision
Viterbi decoder help to alleviate multi-path effects and mutual interference in the reception of multiple
streams. Robust interference detection and suppression are provided to protect against Bluetooth, cordless
phone, and microwave oven interference.
Efficient IQ-imbalance, DC offset, phase noise, frequency offset, and timing offset compensations are
provided for the radio frequency front-end. Selectable digital transmit and receive FIR filters are provided
to meet transmit spectrum mask requirements and to reject adjacent channel interference, respectively.
The RTL8821AE WLAN Controller supports fast receiver Automatic Gain Control (AGC) with
synchronous and asynchronous control loops among antennas, antenna diversity functions, and adaptive
transmit power control function to obtain better performance in the analog portions of the transceiver.
The RTL8821AE WLAN MAC supports 802.11e for multimedia applications, 802.11i for security, and
802.11n/802.11ac Draft 2.0 for enhanced MAC protocol efficiency. Using packet aggregation techniques
such as A-MPDU with BA and A-MSDU, protocol efficiency is significantly improved. Power saving
mechanisms such as Legacy Power Save, and U-APSD, reduce the power wasted during idle time, and
compensate for the extra power required to transmit OFDM. The RTL8821AE provides simple legacy and
20MHz/40MHz/80MHz co-existence mechanisms to ensure backward and network compatibility.
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