RTL8812AEBT Combo module User Manual
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General Description
The Realtek RTL8812AE is a highly integrated single-chip 802.11b/g/n/ac 2T2R WLAN PCI Express
network interface controller, and RTL8761AU is a integrated Bluetooth 2.1/3/0/4.0 USB interface
controller. It combines a WLAN MAC, a 2T2R capable WLAN baseband, BT Protocol Stack (LM, LL, and
LE), BT Baseband, modem, and WLAN/BT RF in a single module. The RTL8812AE with RTL8761AU
provide a complete solution for a high throughput performance integrated wireless LAN and Bluetooth
device.
The RTL8812AE 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 866.6Mbps for 802.11ac OFDM.
A RTL8812AE 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 RTL8812AE 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 RTL8812AE 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