Software defined radio
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This document discusses the implementation of 4PSK modulation and demodulation for software defined radio using an FPGA. It begins by explaining what software defined radio is and how it differs from traditional hardware radios by implementing signal processing in software. The document then discusses the issues with traditional radios and how SDR provides a more flexible solution. It aims to develop and deploy a 4PSK waveform on an FPGA for an SDR platform and evaluate performance using BER, eye diagrams and constellation diagrams. The future scope of using SDR for both defense and commercial applications is also mentioned.
Software defined radio
- 1. FPGA IMPLEMENTATION OF 4PSK MODULATION AND DEMODULATION FOR SOFTWARE DEFINED RADIO
- 2. WHAT IS SOFTWARE DEFINED RADIO ? HOW IS IT DIFFERENT FROM TRADITIONAL HARDWARE RADIO? Software Defined Radio(SDR) is a wireless communication device in which all of the signal processing is implemented in software. SDR defines a collection of hardware and software technologies where some or all of the radio’s operating functions(also referred to as physical layer processing) are implemented through modifiable software or firmware operating on programmableprocessing technologies(FPGA,DSP,PSoC).
- 3. SUPERHETERODYNE RECEIVER (TRADITIONAL RADIO) SOFTWARE DEFINED RADIO
- 4. ISSUES WITH TRADITIONAL RADIO These Radio systems were designed to communicate using one or two waveforms. Two groups of people with different types of traditional radios were not able to communicate. Different set of H/W for different types of radio communications, which limit cross-functionality and can be only modified through physical intervention. This results in higher production costs and minimal flexibility in supporting multiple waveform standards. By contrast, Software Defined Radio(SDR) technology provides an efficient and comparatively in expensive solution to this problem , allowing multimode, multi-band and/or multi-functional wireless devices that can be enhanced using software upgrades.
- 5. AIM OF THE PROJECT Modulation (Mapper+D UC+Mixer) DATA IF(Digital) Digital to Analog convertor (DAC) IF (Analog) RF MODULE RF MODULE Analog to Digital convertor (ADC) IF (Analog) IF(Digital) Demodulati on (Mixer+DD C+Demapp er) DATA
- 6. APPROACH PSK is considered an efficient form of data modulation because it provides the lowest probability of error for a given received signal , when measured over one symbol period. Hence PSK finds widespread use in both military and commercial communication systems. The modulation scheme used for this project is Quadrature Phase-Shift Keying(4PSK) The 4PSK waveform will be developed using Xilinx system generator & Matlab , Simulink tools and implemented on the Virtex-6 Field Programmable Gate Array(FPGA) of SDR platform.
- 7. The objective of the project is to develop and deploy the waveform on Virtex-6 FPGA of SDR platform The performance of the waveform is estimated by Bit Error Rate(BER),Eye diagram and Constellation diagram.
- 8. FUTURE SCOPE Presently SDR is being developed for Defence purpose. The main reason why SDR came into picture is that they want to develop a radio such that they can communicate with each other irrespective of Frequency band limitations This can be achieved by SDR which eliminates different kind of Radio hardware for different RF bands. For commercial purpose SDR has wide range of applications which we can see in near future.