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software defined radios

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  1. 1. Software Defined Radio Technology The term software defined radios (SDRs) is used to describe radios that: •provide software control of a variety of modulation techniques, •wide-band or narrow-band operation, •communications security functions, and •waveform requirements of •current and evolving standards •over a broad frequency range. SDR is an enabling technology applicable across a wide range of areas within the wireless industry that provides efficient and comparatively inexpensive solutions to several constraints posed in current and evolving systems. High-level hierarchical model of wireless communication and its main allocated functions Input and output Human interface, narrowband conversion Service and network support Multiplexing, setup and control, internetworking Source coding and decoding Audio, data, video and fax interfaces Information security Authentication, data integrity Transmission security Hopping, spreading Modem and IF processing Channel waveforms, predistortion, beamforming RF access Antenna, diversity, RF conversion Channel sets Simultaneity, multiband propagation Information Transfer Thread A Information Security Fron End Processing Information Processing and I/O Control B RF Link Processor Modem Information Security (TRANSEC) Channel set(s) (INFOSEC) C Coding Networking I/O Control RF specific modules Modem specific modules TRSEC specific modules ISEC specific modules Coding specific modules User I/O specific modules Common software Common software Common software Common software Common software Common software Common software OS OS OS OS OS OS OS Radio infrastructure Antenna specific modules Radio solution SDR architectural and application model Solution (software) Vendor #1 Firmware Firmware Firmware Firmware Firmware Antenna hardware RF hardware Modem hardware TRANSEC hardware INFOSEC hardware Coding hardware User I/O hardware Hardware platform Firmware Solution (software) Vendor #n Common (Standard) Application Programming Interface Platform (hardware) Vendor #1 Firmware Solution (software) Vendor #2 Platform (hardware) Vendor #2 Platform (hardware) Vendor #n One of the idea behind SDR technology is that different applications from different vendors could run on different platforms trough a standard API Channel sets RF BB real/com dig/ana RF AUX I/O AUX I Antenna AIR I/O AUX I/O I RF I C C Bits CypherT FlowC AUX I/O I I/O AUX I INFO SEC C C Bits PlainT FlowC AUX TRAN SEC Modem C C Bits CypherT FlowC C C Msg Proc and I/O Remote Control Voice Data FlowC C Routing C Control C: Control/Status I: Information BB: Baseband FlowC: Flow Control Source sets SDR functional interface diagram and SDR implementation levels Network C Common User Control Software Object interface Power Clock 0. Hardware radio no provision is made for any changes of system attributes 1. Software controlled radio control functionality implemented in software, but do not have the ability to change attributes 2. Software defined radio provides a broad operational range wide-band or narrow-band operation, communications security functions and meet the waveform performance requirements of relevant legacy systems 3. Ideal software defined radio eliminates analog amplification or heterodyne mixing prior to digital-analog conversion For more information visit: www.sagax . Sagax, Ltd. Sagax, Ltd. Haller u. 11-13. 1096 Budapest, HUNGARY