Abstract
This article presents results from a study of the potential effects of secondary users operating in unoccupied television spectrum. Television spectrum is known within the wireless communications community as being underutilized, making it a prime candidate for dynamic spectrum access. The proposed use of this open spectrum has prompted questions concerning the quantity of available channel space that could be used without negative impact on consumers who view digital television broadcasts and the viability of secondary use of open channels immediately adjacent to a digital television broadcast channel. In this work, we investigate secondary device operation in the channels directly adjacent to a desired television channel, and the effects upon a selection of consumer digital television (DTV) receivers. Our observations strongly suggest that secondary users could operate "White Space Devices" (WSDs) in unoccupied channel bandwidth directly adjacent to a desired digital television (DTV) channel, with no observable adverse impact upon the reception of the desired channel content.
Highlights
The growing demand for wireless services and applications shows no sign of slowing down
In June 28, 2006, the Senate Commerce Committee adopted “The Advanced Telecommunications and Opportunity Reform Act of 2006” (S. 2686), which built upon the May 2004 Federal Communications Commission (FCC) Notice of Proposed Rulemaking (NPRM) [2] allowing unlicensed devices to utilize unused spectrum in the TV band
We presented related results concerning on the impact of TV transmissions on secondary users at varying distances from a transmission tower, and we provided results that indicated typical current generation consumer digital television (DTV) receivers were capable of error-free reception of adjacent channel DTV broadcasts
Summary
The growing demand for wireless services and applications shows no sign of slowing down. There have been regulatory and legislative efforts to allow new wireless devices access to television (TV) band white space on a per market basis. This approach, referred to as dynamic spectrum access (DSA), allows unlicensed devices to transmit in parts of the spectrum unoccupied by the licensed signals. 2686), which built upon the May 2004 Federal Communications Commission (FCC) Notice of Proposed Rulemaking (NPRM) [2] allowing unlicensed devices to utilize unused spectrum in the TV band This legislation required the FCC to continue with rule making procedures governing the opening of TV channels. The regulatory community must determine the technical rules that devices must use when accessing this spectrum in order to prevent harmful interference to the primary devices (i.e. DTV receivers). We focus on adjacent channel interference, and measure the affects of a single adjacent channel secondary transmission on a selection of DTV receivers
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