Advanced Signal Processing Techniques for Cognitive Radio Systems - II
This proposal is devoted to the design of highly efficient wireless communication systems using dynamic spectrum access. This paradigm results in better usage of the radio resource but requires transceivers with cognitive capabilities (â€œCognitive Radioâ€) in order to ensure coexistence with other services in the same frequency band. This requirement poses a series of design challenges for the physical and medium access control layers of such Cognitive Radio networks:
- Communication must be done without disturbing the operation of other services with higher priority. Thus intelligent interference management and control are required.
- In turn, interference control requires spectrum sensing capabilities in order to gather the necessary information about those services with higher priority in a reliable manner.
- Methods to quantify these requirements must be developed, together with techniques to effectively translate such requirements into transceiver configurations.
The lines of research included in this proposal are related to different problems stemming from the above issues. Specifically, signal processing and communication system design tools will be applied to development of the following:
- Local sensing techniques: each individual Cognitive Radio must be able to sense the environment in harsh conditions (interference, low SNR). Thus robustness is critical.
- Distributed sensing techniques: the Cognitive Radio network should include distributed estimation and detection capabilities, as well as node location, in order to improve the quality of its environment related knowledge. The hidden station problem is a most prominent example. Data fusion rules for this particular environment must be devised.
- High performance transmission techniques: in order to achieve the required throughputs, advanced schemes such as cooperative strategies, transmission with side information, exploiting channel status information, and source-channel coding, should be all tailored to the strict interference constraints found in Cognitive Radio operation.
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