Interference to DTV reception from FM radio signals
IEEE Transactions on Consumer Electronics
The technical basis for spectrum rights: Policies to enhance market efficiency
Telecommunications Policy
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More and more systems need to be squeezed together in frequency, space and time in order to satisfy the growth in demand for radio services. However, greater proximity increases the risk of service breakdowns caused both by poor interference tolerance in receivers and by inappropriate signals radiated by transmitters. In order to maximize the value of radio operation, a system view that facilitates trade-offs between receiver and transmitter performance is required. However, radio operation has traditionally been regulated using limits on transmitters, with few if any explicit constraints on receivers. This paper brings receivers into the regulatory picture by using harm claim thresholds, that is, interfering signal levels set by the regulator or spectrum manager that have to be exceeded before a receiving system operator can claim harmful interference; the specification of receiver performance (aka receiver standards) is left to manufacturers and operators. The paper explains how harm claim thresholds would be defined from both radio engineering and regulatory perspectives, and outlines how parameter values can be derived for television service and for a new allocation with cellular service in the adjacent band. Harm claim thresholds benefit both radio system operators and regulators by providing greater clarity about the entitlements that are entailed in assignments. They reduce business risk, and allow regulators to delegate both engineering design and boundary adjustment decisions to operators, thus allowing market forces to work more efficiently. These attributes will be particularly useful in bands with many, diverse and rapidly changing services and devices.