Wireless Base Station

Wireless Basestation Design Using Reconfigurable AMCs

Kristen Zaffini, Marketing Manager, BittWare Inc.
Ron Huizen, VP of Technology, BittWare Inc.
December, 2007

Wireless Basestation Architecture

A wireless basestation is a good example of how one reconfigurable AMC can be used to provide the many building blocks of a complex wireless system. The system architecture of a wireless basestation is comprised of four pieces. The radio interface provides an analog signal or digital Intermediate Frequency (IF) to the system. Next is the physical layer processing (PHY), which provides the baseband processing (and modem). The last two blocks in the system are data link layer processing (media access controller (MAC)), and the networkinterface. BittWare’s GXAMC is an FPGA-based AMC that can be used for both the radio interface and the physical layer processing. If a DSP is required, BittWare’s hybrid signal processing AMC - the B2-AMC - can be used for the PHY processing. Both boards provide a reconfigurable interface that can be tailored to the required task.

Radio Interface

The radio interface is the interface between the radio and the physical layer processing. Analog IF requires A/D converters (ADCs) and Digital Down Converters (DDCs) for the receive path. On the transmit path, analog IF requires Digital Up Converters (DUC) and D/A Converters (DACs). If the interface is digital IF, the requirements depend on the protocol being employed. For CPRI or OBSAI, SerDes tranceivers - many times optical - are needed. If there is a proprietary protocol being employed, then the transceivers can be SerDes,LVDS, or DIO.

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 Wireless Basestation Design Using Reconfigurable AMCs