Broadband beamforming and null-steering based on fractional delay in OFDM systems
Conference: European Wireless 2014 - 20th European Wireless Conference
05/14/2014 - 05/16/2014 at Barcelona, Spain
Proceedings: European Wireless 2014
Pages: 6Language: englishTyp: PDF
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Authors:
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)
Abstract:
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.