Abstract
For transceivers operating in television white space (TVWS), frequency agility and strict spectral mask fulfillments are vital. In the U.K., TVWS covers a 320-MHz-wide frequency band in the UHF range, and the aim of this brief is to present a wideband digital up- and downconverter for this scenario. Sampling at radio frequency (RF), a two-stage digital conversion is presented, which consists of a polyphase filter (PPF) for implicit upsampling and decimation, and a filter-bank-based multicarrier approach to resolve the 8-MHz channels within the TVWS band. We demonstrate that the up- and downconversion 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. A field-programmable gate array 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.
Highlights
T HE switch from analog to digital television (TV) has resulted in the local availability of benign wireless communication channels in the so-called TV white space (TVWS) spectrum, which has triggered a number of important applications including rural broadband access [1], [2]
Wireless transmission over TVWS sets a number of requirements to potential devices, including frequency agility in order to select and change channels depending on geolocation, and the strict adherence to spectral masks which are likely to be imposed by regulators to protect incumbent users [4]
With substantial progress in the area of analog-to-digital (ADC) and digital-to-analog conversion (DAC), softwaredefined radio transceivers that exhibit the frequency agility and flexibility required of future TVWS devices appear viable
Summary
T HE switch from analog to digital television (TV) has resulted in the local availability of benign wireless communication channels in the so-called TV white space (TVWS) spectrum, which has triggered a number of important applications including rural broadband access [1], [2]. The latter offers infrastructure for smart grid [3] and potentially 5G services.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
