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Reconfigurable Terminals for SDR
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SDR in the handset Perhaps the most significant issue wireless-system manufacturers face is the lack of compatibility in worldwide communications standards. The lack of a universal standard requires handset manufacturers to produce multiple models with differing electronics and programming for each standard. For users, the lack of commonality means that a handset probably won't work if you are traveling internationally. Software-defined radio has the opportunity to address these problems. SDR is used to describe wireless handset systems that provide software control of a variety of modulation techniques, band operation, communications security functions, and waveform requirements of current and evolving standards over a broad frequency range. SDR handsets can be dynamically programmed to reconfigure operations for better performance, richer feature sets, new services to the end user and new business for the service provider. SDR handsets require an operating system that can be scaled from basic operation to support complex feature sets and interactive applications. The ability to use a single OS across a handset product line, while supporting a wide range of applications reliably, has the potential to make SDR an attractive and cost-effective alternative as advanced designs incorporating 2.5- and third-generation technologies emerge into the market. The processing power required of SDR handsets makes it likely that a design would consist of multiple processors for designated purposes, including one or more DSPs for signal processing and conversion. With most RTOSes, the interprocess communications (IPC) between the primary processor and DSP is done with special-purpose mechanisms, such as shared memory spaces, remote procedure calls or pipes. Because these mechanisms are typically added on or customized after the fact, they are not necessarily consistent with the performance and reliability goals of the system as a whole. One operating system that meets many of the requirements for SDR is OSE, a message-passing RTOS with a proven long-term record in telecommunications and wireless applications.
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