室內(nèi)定位被稱為室外GPS定位技術(shù)的延展，室內(nèi)定位主要用于人員的管理、被標(biāo)簽物的追蹤等等，可實現(xiàn)非可視內(nèi)容的可視化，在現(xiàn)實生活中有著重要的實際意義。 基于藍(lán)牙beacon的室內(nèi)定位技術(shù)以其藍(lán)牙beacon基站的低功耗、低成本、易部署、體積小、續(xù)航時間長、精度較高等優(yōu)點被廣泛應(yīng)用于室內(nèi)定位領(lǐng)域。

　　1. General Description The RTL8822BS-CG is a highly integrated single with Multi-user MIMO （Multiple-Input， Multiple controller， SDIO （SDIO 1.1/2.0/3.0） interface， and HS WLAN MAC， a 2T2R capable WLAN baseband， and RF in s single chip. The RTL8822BS provides a complete solution for a high The RTL8822BS-CG baseband implements Multi MIMO） Orthogonal Frequency Division Multiplexing （OFDM） with two transmit paths （2T2R）。 Features include two spatial stream transmissions， short Guard Interval （GI） of 400ns， spatial spreading， and support for variant channel bandwidth. Moreover， RTL8822BS provides one spatial stream space-time Low Density Parity Check （LDPC） to extend the range and good minimum sensitivity is achieved by having the recipient， the RTL8822BS-CG also supports explicit sounding senders with beamforming capability. For legacy compatibility， Direct Sequence Spread Spectrum （DSSS）， Complementary Code Keying （CCK） and OFDM baseband processing are included to support 802.11g and 802.11a data rates.Differential phase shift keying modulation schemes， DBPSK and DQPSK with data scrambling capability rates， with long or short preamble. The high speed 16QAM， 64QAM and 256QAM modulation of the coding rate of 1/2， 2/3， 3/4， and 5/6， provide up to 866.7Mbps The RTL8822BS-CG builds in an enhan equalizer， and a soft-decision Viterbi decoder to alleviate severe multi interference in the reception of multiple streams. For better detection quality， receive diversity with Maximal-Ratio-Combine （MRC） interference detection and suppression are and microwave oven interference. Receive vector diversity for multi-stream app MIMO channel. Efficient IQ-imbalance， DC offset， phase noise， frequency offset， and timing offset compensations are provided for the radio frequency front The RTL8822BS-CG supports fast receive 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. The RTL8822BS-CG MAC supports 802.11e for multimedia applications， 802.11i and WAPI （Wireless Authentication Privacy Infrastructure） for security， and 802.11n/802.11ac for enhanced MAC protocol efficiency. Using packet aggregation techniques such as A General Description CG is a highly integrated single-chip that support 2-stream 802.11ac solutions Input， Multiple-Output） with integrated Bluetooth 2.1/3.0/4.1 SDIO （SDIO 1.1/2.0/3.0） interface， and HS-UART mixed interface. It combines a capable WLAN baseband， and RF in s single chip. The RTL8822BS high-performance integrated wireless and Bluetooth device. CG baseband implements Multi-user Multiple Input， Multiple Output （MU Orthogonal Frequency Division Multiplexing （OFDM） with two transmit and two receive Features include two spatial stream transmissions， short Guard Interval （GI） of support for variant channel bandwidth. Moreover， RTL8822BS 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 CG also supports explicit sounding packet feedback that helps senders with beamforming capability. For legacy compatibility， Direct Sequence Spread Spectrum （DSSS）， Complementary Code 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. CG builds in an enhanced signal detector， an adaptive frequency domain decision Viterbi decoder to alleviate severe multi-path effects and mutual of multiple streams. For better detection quality， receive diversity Combine （MRC） applying up to two receive paths is implemented. Robust interference detection and suppression are provided to protect against Bluetooth， cordless phone， stream application is implemented for efficient utilization of the imbalance， DC offset， phase noise， frequency offset， and timing are provided for the radio frequency front-end. CG supports fast receiver Automatic Gain Control （AGC） with synchronous and asynchronous control loops among antennas， antenna diversity functions， and adaptive transmit control functions to obtain better performance in the analog portions of the transceiver. CG MAC supports 802.11e for multimedia applications， 802.11i and WAPI Authentication Privacy Infrastructure） for security， and 802.11n/802.11ac for enhanced efficiency. Using packet aggregation techniques such as A-MPDU with BA and stream 802.11ac solutions Output） with integrated Bluetooth 2.1/3.0/4.1 UART mixed interface. It combines a capable WLAN baseband， and RF in s single chip. The RTL8822BS-CG performance integrated wireless and Bluetooth device. user Multiple Input， Multiple Output （MU and two receive Features include two spatial stream transmissions， short Guard Interval （GI） of support for variant channel bandwidth. Moreover， RTL8822BS-CG （STBC）， Transmit Beamforming （TxBF） and range of transmission. At the receiver， extended receiver diversity up to 2 antennas. As packet feedback that helps For legacy compatibility， Direct Sequence Spread Spectrum （DSSS）， Complementary Code all IEEE 802.11b， 802.11g and 802.11a data rates.Differential phase shift keying modulation schemes， DBPSK and are available， and CCK provides support for legacy data FFT/IFFT paths， combined with BPSK， QPSK， individual subcarriers， and rate compatible for IEEE 802.11ac MIMO OFDM. ced signal detector， an adaptive frequency domain path effects and mutual of multiple streams. For better detection quality， receive diversity applying up to two receive paths is implemented. Robust provided to protect against Bluetooth， cordless phone， lication is implemented for efficient utilization of the imbalance， DC offset， phase noise， frequency offset， and timing r Automatic Gain Control （AGC） with synchronous and asynchronous control loops among antennas， antenna diversity functions， and adaptive transmit control functions to obtain better performance in the analog portions of the transceiver. CG MAC supports 802.11e for multimedia applications， 802.11i and WAPI Authentication Privacy Infrastructure） for security， and 802.11n/802.11ac for enhanced MPDU with BA and A-MSDU， protocol efficiency is significantly improved. Power saving mechanisms such as Legacy Power Save， U-APSD， and MIMO power saving reduce the power wasted during idle time， and compensate for the extra power provides simple legacy， 20MHz/40MHz/80MHz and network compatibility.