The Realtek RTL8189ETV is a highly integrated single-chip 802.11n Wireless LAN （WLAN）

　　network SDIO interface （SDIO 1.1/ 2.0/ 3.0 compliant） controller. It is a WLAN MAC， a 1T1R

　　capable WLAN baseband， and WLAN RF in a single chip. The RTL8189ETV provides a

　　complete solution for a high throughput performance integrated wireless LAN device.

　　The RTL8189ETV WLAN baseband implements Orthogonal Frequency Division Multiplexing

　?。∣FDM）with 1 transmit and 1 receive path and is compatible with the IEEE 802.11n

　　specification. Features include one spatial stream transmission， short guard interval （GI） of 400ns，

　　spatial spreading， and transmission over20MHz and 40MHz bandwidth.

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

　　Keying （CCK）and OFDM baseband processing are included to support all IEEE 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， 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 higher data rates of

　　54Mbps and 150Mbps for IEEE 802.11g and 802.11n OFDM respectively.

　　The RTL8189ETV WLAN Controller 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. 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 RTL8189ETV 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 the better performance in the analog

　　portions of the transceiver.

　　The RTL8189ETV WLAN MAC supports 802.11e for multimedia applications， 802.11i for

　　security， and 802.11n 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 compensates for the extra power required to transmit OFDM.

　　The RTL8189ETV provides simple legacy and 20MHz/40MHz co-existence mechanisms to

　　ensure backward and network compatibility.