Introduction
RTL8723DU is a highly integrated single-chip 802.11b/g/n 1T1R WLAN and integrated Bluetooth 2.1/4.2 single-chip with a USB 2.0 multi-function interface. It integrates a WLAN MAC, a 1T1R-capable WLAN baseband, Bluetooth protocol stack, Bluetooth baseband, modem, and WLAN/Bluetooth RF all in a single chip. The chip provides a complete solution for high-performance integrated WLAN and Bluetooth controllers. Its WLAN baseband implements OFDM technology with a 1T1R path, compliant with the 802.11n specification. Features include single spatial stream transmission, 400ns short guard interval, space extension, and transmission over 20MHz and 40MHz bandwidths.
To maintain backward compatibility, the chip incorporates DSSS, CCK, and OFDM baseband processing to support all 802.11b and 802.11g data rates. Available DPSK modulation schemes include DBPSK and DQPSK with data scrambling capability; CCK supports legacy data rates using either long or short preambles. A high-speed FFT/IFFT path, combined with BPSK, QPSK, 16-QAM, and 64-QAM modulation on individual subcarriers, along with rate-compatible punctured convolutional coding at code rates of 1/2, 2/3, 3/4, and 5/6, provides higher data rates of 54Mbps and 150Mbps for 802.11g and 802.11n OFDM, respectively.
The built-in enhanced signal detector, adaptive frequency-domain equalizer, and soft-decision Viterbi decoder help mitigate multipath effects and mutual interference when receiving multiple streams. The chip provides robust interference detection and suppression against Bluetooth, cordless phone, and microwave oven interference.
Efficient IQ imbalance, DC offset, phase noise, frequency offset, and timing offset compensation are provided for the RF front end. Optional digital transmit and receive FIR filters are available to meet transmit spectrum mask requirements and suppress adjacent channel interference, respectively.
The WLAN controller supports fast receive AGC with synchronous and asynchronous control loops between antennas, antenna diversity, and adaptive transmit power control for improved performance of the transceiver analog section.
The WLAN MAC supports 802.11e for multimedia applications, 802.11i for security, and 802.11n for enhanced MAC protocol efficiency. Protocol efficiency is significantly improved through the use of packet aggregation techniques such as A-MPDU with block acknowledgment and A-MSDU.
