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Wideband TV white space transceiver design and implementation

Elliot, Ross A. and Enderwitz, Martin A. and Thompson, Keith and Crockett, Louise H. and Weiss, Stephan and Stewart, Robert W. (2016) Wideband TV white space transceiver design and implementation. IEEE Transactions on Circuits and Systems II: Express Briefs, 63 (1). pp. 24-28. ISSN 1558-3791

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Abstract

For transceivers operating in television white space (TVWS), frequency agility and strict spectral mask fulfilments are vital. In the UK, TVWS covers a 320 MHz wide frequency band in the UHF range, and the aim of this paper is to present a wideband digital up- and down converter for this scenario. Sampling at radio frequency (RF), a two stage digital conversion is presented, which consists of a polyphase filter for implicit upsampling and decimation, and a filter bank-based multicarrier approach to resolve the 8MHz channels within the TVWS band. We demonstrate that the up- and down-conversion of 40 such channels is hardly more costly than that of a single channel. Appropriate filter design can satisfy the mandated spectral mask and control the reconstruction error. An FPGA implementation is discussed, capable of running the wideband transceiver on a single Virtex-7 device with sufficient word length to preserve the spectral mask requirements of the system.