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Maximum Throughput Loss of Noisy ISI Channels Due to Narrowband Interference Naofal AlDhahir and Suhas N. Diggavi

Summary: Maximum Throughput Loss of Noisy ISI Channels Due to Narrowband Interference
Naofal Al­Dhahir and Suhas N. Diggavi
AT&T Shannon Laboratory
Florham Park, NJ 07932
Narrowband interference could occur in transmission media such as twisted pair or coaxial cable. In this letter, we
analyze the effect of such interference on the data throughput for finite--blocklength transmission over noisy inter­symbol
interference channels. It is shown that the worst narrowband interference spreads its power over the sweet spots of the
signal. More precisely, the auto--correlation matrix of worst--case narrowband (rank­deficient) interference is shown to
have the same eigendirections as the signal. We derive the exact spectral shape of the worst narrowband interference
and its associated minimum channel block throughput in closed form.
1 Introduction
Narrowband interference (NBI) is a major impairment for broadband transmission over wired and wireless media. Examples
include the upstream channel in hybrid fiber coaxial (HFC) networks [10], spread spectrum transmissions in the ISM band
[8], and very high speed digital subscriber line (VDSL) transmissions [3].
In many situations, radio frequency interference (RFI) from short--wave radio, Citizen's Band (CB) radio, and amateur
(HAM) radio is the most serious source of NBI. While the spectrum allocations for these services are fixed, the exact
spectral characteristics (spectral shape and frequency support) of RFI at any particular time are generally unknown and
hence need to be adaptively estimated prior to cancellation [2]. Ineffective cable shielding in HFC networks also causes
the ingress of external signals from electrical devices inside the subscriber premises such as TV sets, computers, microwave


Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas


Collections: Engineering