Extraction of a Weak Co-Channel Interfering Communication Signal Using Adaptive Filtering

Abstract

Conventional separation techniques such as filters cannot be used in a scenario where a weak signal is embedded within a stronger signal in the same frequency band. An adaptive filter approach to recover a weak narrowband communication signal embedded in a strong wideband broadcast signal and additive noise is investigated by taking advantage of the known characteristics of the broadcast signal standard. The weak signal considered is a four quadrature amplitude modulation (QAM) communication signal, and the stronger signal is a Digital Terrestrial Multimedia Broadcasting (DTMB) signal, which is the digital television standard for People s Republic of China. The results show that, while the extraction of the weak signal is possible, the characteristics of the transmission channel must be very accurately estimated for the scheme to achieve a reasonable error rate.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2015
Accession Number
ADA620656

Entities

People

  • Woei C. Lee

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Adaptive Filters
  • Amplitude Modulation
  • Broadcasting
  • Communication Channels
  • Communication Systems
  • Demodulators
  • Digital Television
  • Filters
  • Filtration
  • Frequency
  • Frequency Bands
  • Modulation
  • Modulators
  • Multiple Access
  • Orthogonal Frequency Division Multiplexing
  • Parallel Computing
  • Television Systems

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.