Alison Brown and Barry Wolt. Digital L-Band Receiver Architecture with Direct RF Sampling. In IEEE Postition Location and Navigation Symposium, pages 209-216, April 94.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....the upper right hand quadrant of the software radio phasespace shown in figure 1 5. However, the flexibility of the Speakeasy system is considerably more limited than the Virtual Radio. Other Software Radio Systems Projects An all digital L band receiver with direct RF sampling is described in [Brown and Wolt, 94] The receiver uses programmable digital hardware and is designed for satellite communica tions applications such as the Global Positioning System (GPS) The design demonstrates the feasibility of of direct RF sampling and digital separation of in phase and quadrature signals. Software control ....

Alison Brown and Barry Wolt. Digital L-Band Receiver Architecture with Direct RF Sampling. In IEEE Postition Location and Navigation Symposium, pages 209-216, April 94.

....FM demodulation presents a slightly different problem, since the carrier frequency is in the range of 88 108 Mhz. While the direct sampling of these signals is within the range of current 8 bit A D converters, higher resolution converters are not yet fast enough. By using bandpass sampling [5], we can capture the entire FM band by sampling at 43 MHz, instead of sampling the entire band at upwards of 200 Mhz, which would be a challenge not only for the state of A D s but also for processing the signal on today s RISC processors. This is accomplished by first bandpass filtering the ....

Brown,A., Wolt,B., Digital L-band Receiver Architecture with Direct RF sampling, In IEEE Position Loaction and Navigation Symposium, pp. 209-216, April 1994.

....FM demodulation presents a slightly different problem, since the carrier frequency is in the range of 88 108 MHz. While the direct sampling of these signals is within the range of current 8 bit A D converters, higher resolution converters are not yet fast enough. By using bandpass sampling [16], we can capture the entire FM band by sampling at 43 MHz, instead of sampling the entire band at upwards of 200 MHz, which would be a challenge not only for the state of A D s but also for processing the signal on today s RISC processors. We will first bandpass filter the received signal between ....

Brown,A., Wolt,B., Digital L-band Receiver Architecture with Direct RF sampling, In IEEE Position Location and Navigation Symposium, pp. 209-216, April 1994. 11

.... radio is a radio device whose modulation waveforms are defined and generated in software, which introduces flexibility by allowing software programmability [11] Most software radio architectures utilize application specific digital hardware or digital signal processors under software control [5, 13]. Taking the implementation one step further, a virtual radio is a communications device that performs all of its digital signal processing on a commercial, off the shelf workstation or personal computer [3] The SpectrumWare virtual radio system described in this chapter is ideal for developing ....

Alison Brown and Barry Wolt. Digital L-Band Receiver Architecture with Direct RF Sampling. In IEEE Postition Location and Navigation Symposium, pages 209--216, April 1994.

.... all its digital signal processing in user space on an off the shelf workstation (a PC in our case) These devices are quite different from most software radios, which typically are implemented using either application specific digital hardware or digital signal processors under software control [BW94] [LU95] The SpectrumWare project is devoted to building infrastructure to support the construction of virtual radios and to building virtual radios that take advantage of the resources available on the workstation to either provide distinctive functionality or to implement traditional ....

Alison Brown and Barry Wolt. Digital L-Band Receiver Architecture with Direct RF Sampling. In IEEE Postition Location and Navigation Symposium, pages 209--216, April 94.

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