SDR Radio Front-End

'Software-Defined Radio' (SDR) ist ein neuer Ansatz für mobile Kommunikationsarchitekturen. Die Idee hinter dem Ansatz besteht darin, spezielle analoge Hardwarekomponenten durch FPGAs, DSPs und "general purpose processors" (GPPs) zu ersetzen. Dadurch wird ein schnelles Prototyping auf einer flexiblen Plattform ermöglicht. SDR ist die Enabling-Technologie für Green IT und unterstützt mehrere Funkstandards wodurch diese flexibel und energieeffizient ist. SDR-basierte Systeme sind rekonfigurierbar und reduzieren die Entwicklungszeit und -kosten im Vergleich zu Spezialprozessoren.

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The Software Defined Radio (Wikipedia) Frontend is a flexible radio platform consisting of a stacked digital card and an analog radio front-end. This reconfigurable remote radio head supports 2, 4 or 8 transceivers and operates with variable signal bandwidths, carrier frequencies and transmit powers. The compact hardware is uTCA compliant and supports optical (e.g. CPRI) as well as Ethernet high-speed interfaces to baseband real-time processing platforms.

SDR is a platform able to support different communication standards with variable signal bandwidths, carrier frequencies and transmit power. It has capabilities for Multiband, MIMO and beamforming operation using several radio units connected and synchronized via optical fiber.

Block diagramm of the SDR transceiver (software defined radio hardware architecture)

The SDR consists of two stacked cards digital interface and radio frequency front-end. It communicates through optical baseband interface and it is equipped with two radio frequency transceivers. The printed circuit boards (PCB) built based on Advanced Mezzanine Cards (AMC) form factor standards.

Technische Informationen

Features

Supporting CPRI 4.1
Optical SFP baseband interface
2-antenna duplex operation
Wide carrier frequency range
Different reference clock sources
FDD and TDD operation
Variable bandpass RF filter

Specifications

Baseband CPRI data rate of 2457.6 Mbit/s
Xilinx Spartan-6 FPGA
Configurability via RS232 and terminal program or with vendor data from CPRI
2-antenna duplex operation with variable RF signal bandwith ranging from 3 MHz to 50 MHz
400 MHz – 4000 MHz carrier frequency range
Maximal output power (RMS, CW) of 31 dBm at 2.65 GHz
Duplex components (filters, diplexers and/or TDD switches) on extra plug-on modules