Signal analysis for an improved detection of noise from an adjacent channel

US8270928B2 · kind B2 · utility

Assignee

• HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH · DE

Inventors

• Olaf Axtmann · Karlsruhe, DE
• Philipp Schmauderer · Hennef (Sieg), DE
• Christoph Benz · Ohlsbach, DE
• Andreas Körner · Waldbronn, DE

Key dates

• Filing date: May 10, 2010
• Grant date: Sep 18, 2012
• Expiry date: Apr 22, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2001/1045
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A radio receiver may determine whether a received frequency modulated radio signal includes interference from an adjacent channel. The receiver may compare a frequency deviation above the center frequency of the received signal to a frequency deviation below the center frequency of the received signal. The receiver determines that the radio signal is affected by adjacent channel noise when the frequency deviation below the center frequency is substantially different from the frequency deviation above the center frequency. Alternatively, the presence of noise from an adjacent channel may be detected by comparing a positive amplitude and a negative amplitude of a demodulated version of the frequency modulated radio signal. In this alternative, the receiver determines that the radio signal is affected by adjacent channel noise when the extent of the positive amplitude is substantially different from the extent of the negative amplitude.