Design and Implementation of an FPGA-based Soft-Radio Receiver utilizing adaptive tracking

Abstract :


The wireless market of the future will demand inexpensive hardware, expandability, interoperability, and the implementation of advanced signal processing functions-i.e. a software radio. Configurable computing machines are often ideal software radio platforms. In particular, the Stallion reconfigurable processors efficient hardware reuse and scalability fulfill these radios demands. The advantages of Stallion-based design inspired an FPGA-based software radiothe proto-Stallion receiver. This thesis introduces the proto-Stallion architecture and details its implementation on the SLAAC-1V FPGA platform. Although this thesis presents a specific radio implementation, this architecture is flexible; it can support a variety of applications within its fixed framework. This implemented single-user DS-CDMA receiver utilizes an LMS adaptive filter that can combat MAI and constructively combine multipath; most notably, this receiver employs an adaptive tracking algorithm that harnesses the LMS algorithm to maintain symbol synchronization. The proto-Stallion receiver demonstrates the dependence of adaptive tracking on channel noise; the algorithm requires significant noise levels to maintain synchronization.

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