User's Manual

RTL8822CE

Datasheet

Single-Chip 802.11 ac/a/b/g/n 2T2R WLAN Controller

with PCI-E Interface

Track ID: Rev. 0.1

1. General Description

The Realtek RTL8822CE is a highly integrated single-chip that support 2-stream 802.11ac solutions with

Multi-user MIMO (Multiple-Input , Multiple-Output) with Wireless LAN (WLAN) PCI Express network

interface controller with integrated Bluetooth 5 USB interface controller. It combines a WLAN MAC, a

2T2R capable WLAN baseband, and RF in single chip. The RTL8822CE-CG provides a complete solution

for a high-performance integrated wireless and Bluetooth device.

The RTL8822CE baseband implements Multi-user Multiple Input, Multiple Output (MU-MIMO)

Orthogonal Frequency Division Multiplexing (OFDM) with two transmit and two receive paths (2T2R).

Features include two spatial stream transmissions, short Guard Interval (GI) of 400ns, spatial spreading,

and support for variant channel bandwidth. Moreover, RTL8822CE provides one spatial stream space-time

block code (STBC), Transmit Beamforming (TxBF) and Low Density Parity Check (LDPC) to extend the

range of transmission. At the receiver, extended range and good minimum sensitivity is achieved by having

receiver diversity up to 2 antennas. As the recipient, the RTL8822CE also supports explicit sounding packet

feedback that helps senders with beamforming capability.

For legacy compatibility, Direct Sequence Spread Spectrum (DSSS), Complementary Code Keying (CCK)

and OFDM baseband processing are included to support all IEEE 802.11b, 802.11g and 802.11a 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 256QAM modulation of the

individual subcarriers, and rate compatible coding rate of 1/2, 2/3, 3/4, and 5/6, provide up to 866.7Mbps

for IEEE 802.11ac MIMO OFDM.

The RTL8822CE builds in an enhanced signal detector, an adaptive frequency domain equalizer, and a

soft-decision Viterbi decoder to alleviate severe multi-path effects and mutual interference in the reception

of multiple streams. For better detection quality, receive diversity with Maximal-Ratio-Combine (MRC)

applying up to two receive paths, and Maximum-Likelihood Detection (MLD) are implemented. Robust

interference detection and suppression are provided to protect against Bluetooth, cordless phone, and

microwave oven interference.

Receive vector diversity for multi-stream application is implemented for efficient utilization of the MIMO

channel. Efficient IQ-imbalance, DC offset, phase noise, frequency offset, and timing offset compensations

are provided for the radio frequency front-end.

The RTL8822CE supports fast receiver Automatic Gain Control (AGC) with synchronous and

asynchronous control loops among antennas, antenna diversity functions, and adaptive transmit power

control functions to obtain better performance in the analog portions of the transceiver.