RTL8192E-GR Просмотр технического описания (PDF) - Realtek Semiconductor
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RTL8192E-GR Datasheet PDF : 3 Pages
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Realtek RTL8192E
IEEE 802.11a/b/g/n WLAN Controller with PCI-Express Interface
General Description
The Realtek RTL8192E-GR is a highly integrated MIMO (Multiple In, Multiple Out) Wireless LAN (WLAN) solution
complying with the IEEE 802.11n Draft specification 2.0. It combines a MAC and 2T2R capable baseband in a
single chip. When coupled with Realtek’s RF IC’s (RTL8256 at 2.4GHz), the RTL8192E-GR provides a complete
solution for a high-performance wireless client.
The RTL8192E-GR baseband implements 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 both 20MHz and 40MHz channel bandwidth. The RTL8192E-GR
provides spatial stream Space-Time Block Code (STBC) to extend transmission range. As a receiver, extended
range and good minimum sensitivity is achieved by having receiver diversity via 2 antennas. The RTL8192E-GR
also supports explicit ‘sounding packet’ feedback that helps senders with beamforming capability. With two
independent RF ICs, the RTL8192E-GR can perform fast roaming without link interruption.
For backward compatibility, Direct Sequence Spread Spectrum (DSSS), Complementary Code Keying (CCK) and
OFDM baseband processing are included to support all IEEE 802.11a, 802.11b, 802.11g and 802.11j 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, and 64QAM 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 the higher data
rates of 54Mbps and 300Mbps for IEEE 802.11a/g and 802.11n MIMO OFDM respectively.
The RTL8192E-GR 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 is implemented. Robust interference detection and suppression are provided to protect
against Bluetooth, cordless phone, and microwave oven interference. Radar detection and Dynamic Frequency
Selection (DFS) are supported to further protect against 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. Selectable digital transmit and receive FIR filters are provided to
meet transmit spectrum mask requirements and to reject adjacent channel interference, respectively.
The RTL8192E-GR 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.
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