Currently, most Software Defined Radio (SDR) related products and researches focus on analog communication and voice transmission. In this paper, we propose a SDR platform with digital data communication capability. This platform consists of Field Programmable Gate Array (FPGA) based radio hardware and open source SDR software modules. The main features include: 1) Radio Spectrum Sensing; 2) Re...

To solve the problem of the high cost in the GPRS communication and the limit transmission distance of WiFi, a transmission scheme for distant agriculture image acquisition was designed based on digital transmission radio in this paper. However, the majority of current digital transmission radio was designed for a small amount of data transmission. It could get a greater transmission distance w...

of software radio is the expansion of digital signal processing toward the antenna, and thus to regions where analog signal processing has been dominant so far. It is straightforward to realize that the hardware platform is a most prominent enabling component of a software radio terminal. Of special interest is the very part of the terminal where analog signal processing is replaced by digital ...

1 Direct conversion of a radio signal into digital representation is highly desired. Such a system would allow all radio signal processing to be done completely in the digital domain. This is beneficial for many reasons. First, it allows for an RF system to take full advantage of the availability of inexpensive digital computation brought by modern digital CMOS processes. Second, computation in...

Digital Media Technologies offer enhanced multimedia signal broadcasting and description of the signal on content. Digital Audio Broadcasting (DAB) is a media standard with extended multimedia capabilities, offering novel services to users worldwide. Each digital broadcasting standard though, cannot be separately viewed from the development of Internet radio broadcasting. In this paper we intro...

Because of its unique digital transmission, HD Radio® requires new methods and standards to measure and predict signal coverage, relative to analog FM. Because analog FM reception quality is known to decline gradually with degraded RF signal quality, analog FM service may be quantified in simple terms of signal strength. With digital audio broadcasting, reception quality remains ‘perfect’ until...

In order to meet the ever increasing demand for larger transmission bandwidth, Wireless network based on radioover-fiber technologies is a very beneficial solution. This architecture provides flexibility,mobility and high Bandwidth. A digitized RF-over-Fiber transmission scheme based on Bandpass Sampling theory is being introduced. Various Impairments of Analog Radio over Fiber link such as non...

Implementation of RFID reader/writer on software defined radio is studied in this paper. The target RFID is ISO18000-3 mode 2 which has 8 reply channels for simultaneous communication with 8 different RFID tags. In the software defined radio architecture, the 8 reply channels are sampled at a single A/D converter and separated by digital down converters, whereas conventional RFID architecture h...

Narrowband radio transmitters like radio amateurs and broadcast radio stations are considered to be a serious problem for highbitrate data transmission over twisted pairs. Due to its high power level, radio frequency interference (RFI) has the potential of overloading the receiver’s analog-to-digital converter (ADC). Once the ADC is in saturation, any countermeasure taken in digital domain will...