Spectrum Sharing & Management

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Stanford Reference 09-327 Abstract Stanford researchers have developed a network architecture that enables spectrum sharing between a primary and a secondary communication system operating in an overlapping geographical region. This invention allows a secondary transmitter to efficiently make use of a primary spectrum for its own communication while ensuring that simultaneous primary transmission is not affected. The primary and secondary wireless communication system may be any kind of wireless communication system. A preferred embodiment is to enable communication of cellular networks in TV spectrum without interference to TV transmission. This approach can bring benefits to both cellular and TV network operators in terms of performance and increased capacity. Stage of Research: Researchers have demonstrated the feasibility of an overlay cognitive system in which the secondary user is a cellular network co-existent with a TV system in the same frequency band, resulting in higher efficiency of bandwidth use. Continued research to evaluate more general channel models and investigate the performance with more sophisticated propagation models. Applications Wireless communication systems Can be applied to many primary and secondary wireless communication systems A preferred embodiment is the combination of a TV broadcast system (as the primary system) and mobile communications system (as the secondary system) Advantages Efficient spectral utilization Capacity gains High performance No interference between primary and secondary systems Publications WIPO Patent Application PCT/US2011/000632 J. Sachs, I. Maric and A. Goldsmith, "Cognitive Cellular Systems within the TV Spectrum," IEEE Int. Symp. on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2010), Singapore, Jan. 2010. Maric, A. Goldsmith, G. Kramer and S. Shamai (Shitz), "On the Capacity of Interference Channels with One Cooperating Transmitter," European Transactions on Telecommunications, Vol. 19, pp. 405-420, Apr. 2008. A. Goldsmith, S. A. Jafar, I. Maric and S. Srinivasa, "Breaking Spectrum Gridlock with Cognitive Radios: An Information Theoretic Perspective,"  Proceedings of the IEEE, invited, Vol. 97, no. 5, pp. 894-914, May 2009 Related Web Links Professor Andrea Goldsmith Profile Wireless Systems Lab Patent Status Issued: 9,204,309 (USA) Related Keywords cognitive radio channel   communications: broadcasting   communications: wireless   spectrum sharing   Cooperative diversity   cooperative multi-access   dynamic spectrum access   Cognitive Overlay Radios   semiconductor: RF   Interference Channel   Joint Decoding   Superposition Coding   Wireless Networking   communications: networking   network architecture   semiconductors