Silicon Flatirons Scholars Influence
FCC Receivers Proceeding
On Thursday, April 21 the FCC unanimously started a proceeding that will explore ways to promote, in its words, the efficient use of spectrum through improved receiver interference immunity performance.

In a news release, the Commission noted that while its “spectrum management efforts often have focused on transmitter regulations, the Notice of Inquiry adopted today will take a fresh look at the role of receivers and how improved receiver performance can promote more efficient spectrum use and enable valuable new services to be introduced that will benefit the American public.”

The Notice of Inquiry reflects the pioneering work that JP (Pierre) de Vries and especially Dale Hatfield have been doing on this topic for many years. The NOI cites several Silicon Flatirons reports and describes five FCC Technological Advisory Council (TAC) white papers that included Hatfield and/or De Vries as authors (De Vries was the lead author on three of them). Receiver issues were addressed in several Silicon Flatirons events, including a summit in 2009 and a conference in 2010.

De Vries was invited to present his ideas to the FCC TAC on Tuesday, April 26; a video recording and slide deck are available here. He argued that receiver performance is at the root of many if not most harmful interference disputes. He conceded that hard or soft regulatory requirements on receiver performance would be better than doing nothing but noted that they’re hard for the FCC to use in practice. He made the case for harm claim thresholds (aka interference limits), an explicit, up-front statement of the interference that must be exceeded before receiving system can bring a harmful interference claim. Since operators cannot claim harmful interference if neighbor’s signal is below the threshold, they are incentivized to improve receiver performance.
Dale Hatfield
“As a long-time proponent of the FCC devoting increased attention to receiver performance in its regulatory and policymaking roles, I was elated by the bi-partisan action the agency took on April 21st to address the topic of poorly performing receivers. Under-performing receivers can lead to inefficiency in the use of radio spectrum a loss in capacity that the Nation can ill afford in an age of fast-growing demand for access to the resource. Spectrum is needed to foster economic growth and innovation, ensure national and homeland security, support both commercial and scientific applications of the resource, and promote U.S. leadership in communications and related technologies worldwide.

I was pleased that the FCC explicitly acknowledged the decades-long role that Silicon Flatirons has played in the lead up to the action by its sponsorship of relevant events and publications. I was especially gratified that it recognized the intellectual leadership of my Silicon Flatirons colleague, De Vries, in developing alternative approaches for addressing the complex technical, economic, regulatory and policy issues raised by increased congestion of our Nation’s airwaves.”
JP (Pierre) de Vries
“I’m delighted that the Commission has recognized the role of receivers in efficient and resilient radio operations. Its Notice of Inquiry (NOI) about improved receiver interference immunity, and the rulemaking that I hope will follow, gives the U.S. an opportunity to take the lead internationally by shifting the regulatory emphasis from receiver performance standards to describing the interference environment that affected systems should expect to operate in. Such an interference limits approach leaves receiver design to manufacturers and operators, where it belongs.

I’m grateful for the Commission’s recognition of the potential of harm claim thresholds, and particularly Commissioner Simington’s leadership in this area. The NOI builds on Dale Hatfield’s thought leadership over many decades. It reflects the efforts and insight of Commissioners and OET staff over many years, especially in guiding and supporting the extensive work done by the FCC Technological Advisory Committee.

This NOI does not come a moment too soon. For decades there has been chronic conflict between services in adjacent bands over acceptable receiver performance, and it has become acute recently. The time has come to fully include receivers as well as transmitters in the regulatory calculus.

Receiver performance certainly plays a critical role in productive and robust radio use, especially in adjacent bands that support different services. However, it’s difficult and inefficient for third parties to set receiver performance criteria: for a regulator, because it does not have the in-house expertise; and for industry standards groups since they typically reflect the interests of just one side of a contested band edge. The best way to include receivers in the mix is for the FCC to specify the socially optimal interference constraints on the whole transmitter-receiver system.”
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