Posedge WLAN - 802.11 a/b/g/n/ac
A
wireless local area network (
WLAN) links two or more devices using some wireless distribution method (typically spread-spectrum or OFDM radio), and usually providing a connection through an access point to the wider internet.
IEEE 802.11 defines the physical layer (PHY) and MAC (Media Access Control) layers based on CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance). The 802.11 specification includes provisions designed to minimize collisions.
The 802.11 has two basic modes of operation: Ad hoc mode enables peer-to-peer transmission between mobile units. Infrastructure mode in which mobile units communicate through an access point that serves as a bridge to a wired network infrastructure is the more common wireless LAN application the one being covered. Since wireless communication uses a more open medium for communication in comparison to wired LANs, the 802.11 designers also included shared-key encryption mechanisms: Wired equivalent privacy (WEP), Wi-Fi protected access (WPA, WPA2), to secure wireless computer networks.
A Wireless Distribution System allows a wireless network to be expanded using multiple access points without the need for a wired backbone to link. The notable advantage of WDS over other solutions is that it preserves the MAC addresses of client packets across links between access points.
Posedge WLAN product portfolio includes:
- 2x2 MIMO WLAN MAC/Baseband.
- 2x2 MIMO WLAN RF Transceiver.
The Posedge WLAN Baseband Processor (PE-BB-4220) is a low-cost, low-power, high-performance, and a highly-integrated solution for 802.11a/b/g/n, designed to support high throughputs for next generation Wireless LAN applications. It is a complete solution with Software, Firmware and RTL, to enable wireless connectivity to laptops, phones, TVs.
Block diagram of the Wireless LAN System
The Posedge WLAN RF Transceiver (PE-RF-2220) is a low-cost, low-power, high-performance, and a highly-integrated RF transceiver for 802.11b/g/n with two RF chains in both Transmit and Receive to support 2x2 MIMO. The high efficiency embedded Power Amplifier is optimal for both high power and low power reducing the BOM cost.
2x2 RF Transceiver High Level Block Diagram
Benefits:
- Highly integrated and saves BOM Cost
- Very Low Power implementation with different modes
- Sensitivity exceeds far beyond Specification
- Tight Power Control with TSSI indication
- Very Low Noise Figure
- IQ Imbalance calibration
- High Performance PAPD algorithms
- LO Leakage Control
- Fast AGC convergence
- Antenna Tuning Module.
- Radar Detection Support
- Very Low Gate Count (and Low power)
- Very Low Host MIPS requirement
- TCP level throughput of about 200 Mbps
Deliverables:
- Verilog Source Code
- GDS-II for RF
- Synthesis Scripts
- Simulation Environment
- Software Drivers
- Documentation
- FPGA validation scripts
- Integration Manual
- Reference Schematics
- Wi-Fi Alliance Suite
- Production Vectors
- Silicon Vectors
- Manufacturing Tests
Applications:
- Wireless Access Points / Routers
- Wireless Stations in Desktops
- Mobile Devices
- Networked TVs
- Network Attached Storage.
