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Reduction of non-orthogonal interference in OFDM receivers by optimized windowing

: Nickel, P.; Gerstacker, W.; Jonietz, C.; Kilian, G.; Heuberger, A.; Koch, W.

Frequenz 61 (2007), Nr.1-2, S.15-18
ISSN: 0016-1136
ISSN: 2191-6349
Fraunhofer IIS ()

For conventional orthogonal frequency-division multiplexing (OFDM) systems, the guard interval is disregarded in the receiver and rectangular shaped windows are used implicitly due to the discrete Fourier transform (DFT). We consider a Nyquist-shaped window in the receiver, so that the transmit signal does not need to be modified, and optimize the window shape in order to suppress interference from non-orthogonal single carrier interferer signals. For the window coefficients, a closed form solution is derived. This type of interference occurs for example in OFDM radio systems like Digital Radio Mondiale (DRM) that are operating in low frequency bands. (Disturbance is given for instance by harmonics of switched-mode power supplies.) Further, for multiple interferers, the receiver with optimized window outperforms the conventional receiver.