ViewSonic VS17337 Users Manual

使用手冊

User’s Manual

產品名稱: RF Module

廠牌: ViewSonic

型號: VS17803

1. General Description

The VS17803 is a highly-integrated IEEE 802.11 a/b/g/n/acMAC/Baseband/RF WLAN and Bluetooth Baseband/RF
single chip. For Wireless LAN (WLAN) operation, it supports 1-stream 802.11ac solution with Multi-user MIMO (Multiple­Input, Multiple-Output) STA mode with USB2.0 network interface controller. For Bluetooth operation, it supports
Bluetooth 2.1/4.2 with USB interface controller.

The VS17803 baseband implements multiuser Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division
Multiplexing (OFDM) STA mode with one transmit and one receive path (1T1R). Features include one spatial stream
transmission, short Guard Interval (GI) of 400ns, spatial spreading, and support for variant channel bandwidths.
Moreover, RTL8821CU-CG
provides one spatial stream Space-Time Block Code (STBC) and Low Density Parity Check (LDPC) to extend the range
of transmission. As the recipient, the RTL8821CU-CG 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 802.11a, 802.11b and 802.11g data rates. Differential phase shift
keying modulation schemes, DBPSK and DQPSK with data scrambling capability, are available. CCK provides support
for legacy data rates, with long or short preamble. The high speed FFT/IFFT paths are combined with BPSK, QPSK,
16QAM, 64QAM and 256QAM modulation of the individual subcarriers. The compatible coding rate of 1/2, 2/3, 3/4, and
5/6 provides up to 433.3Mbps for IEEE 802.11ac with MIMO-OFDM.

The VS17803 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.
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 VS17803 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.

The VS17803 MAC supports 802.11e for multimedia applications, 802.11i and WAPI (Wireless Authentication Privacy
Infrastructure) for security, and 802.11n/ac for enhanced MAC protocol efficiency. Protocol efficiency is significantly
improved by using packet aggregation techniques, such as A-MPDU with BA and A-MSDU. Power saving mechanisms,
such as Legacy Power Save, U-APSD, and MIMO, can reduce the power wasted during idle time. They can also
compensate for the extra power required to transmit MIMO-OFDM. The RTL8821CU-CG provides simple legacy and
20MHz/40MHz/80MHz co-existence mechanism to ensure backward and network compatibility.

The VS17803 Bluetooth controller complies with Bluetooth core specification v4.2, and supports dual mode (BR/EDR +
AMP + Low Energy Controllers). It is backward compatible with previous versions including v2.1 + EDR and v3.0 + HS.
For BR/EDR, it can support scatternet topology up to four active links in slave mode, and seven active links in master
mode. For Low Energy, it supports multiple states and allows eight active links in master mode. Both BR/EDR and LE
can operate simultaneously.

2. Features

3. General Specification

4. DC Characteristics