Broadband beamforming and null-steering based on fractional delay in OFDM systems

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Martinez, Javier; Zarzuelo, Carlos (Indra Sistemas, Ctra Loeches, 9. Torrejon de Ardoz, 28850, Madrid, Spain)
Iglesias, Victor; Grajal, Jesus (ETSIT, Universidad Politecnica de Madrid, Avda. Complutense, 30. 28040, Madrid, Spain)

This paper proposes a method to perform simultaneous broadband beamforming and null-steering based on fractional delay filters. An analytical approach in the time domain is studied to obtain an instantaneous response for a fixed beamformer with very low complexity. The simulation of the beamformer in a broadband OFDM system shows the effectiveness of this method to improve the effective signal-to-interference-plus-noise-ratio. The process gain obtained by beam-steering improves the effective signal-to-noise-ratio reducing the BER, while the null-steering capacity guarantees the performance of the receiver even in scenarios with strong interferences.