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Lu, H. (author), Xu, T. (author), Nikookar, H. (author)The development of wireless communication applications in the last few years is unprecedented. Wireless communication has evolved in various ways. The next generation of wireless systems should service more users while supporting mobility and high data rates. These requirements necessitate efficient use of available resources to provide...book chapter 2012
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Lian, X. (author), Nikookar, H. (author), Ligthart, L.P. (author)Cognitive radio (CR) is an intelligent radio system and is able to share the spectrum with licensed users (LU). By adopting adaptive beam forming techniques, CR can reuse the spectrum with LU via directing main beams towards CR users while displaying nulls towards LU. In this article, we present a new distributed beam forming (DB) technique, and...journal article 2012
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Lian, X. (author), Nikookar, H. (author), Ligthart, L.P. (author)In this paper, we introduce Adaptive Beamforming (AB) and Distributed Beamforming (DB) as two efficient techniques for IntelligentWiMAX (I-WiMAX). I-WiMAX is a new maritime communication system, consisting of Smart Radio (SR) principles and mobile WiMAX based on the IEEE 802.16e standard. Adopting AB, the same spectrum can accommodate more users...journal article 2011
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Lu, H. (author), Xu, T. (author), Nikookar, H. (author), Ligthart, L.P. (author)In this paper, we investigate the diversity, capacity and complexity issues of cooperative Zero-Padding (ZP)-Orthogonal FrequencyDivisionMultiplexing (OFDM) communication. We consider cooperative ZP-OFDM communication over a multipath Rayleigh channel and with multiple Carrier Frequency Offsets (CFOs) existing at different relays. We use a...journal article 2011
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Lakshmanan, M.K. (author), Karamehmedovic, D. (author), Nikookar, H. (author)Wavelet Packet based Multi-Carrier Modulation (WPMCM) offers an alternative to the well-established OFDM as an efficient multicarrier modulation technique. It has the advantage of being a generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements and constraints of advanced communication...journal article 2010
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Nikookar, H. (author), Xu, T. (author), Lu, H. (author)Signal fading due to multi-path propagation is one of the major impairments to meet the demands of next generation wireless networks for high data rate services. To mitigate the fading effects, time, frequency, and spatial diversity techniques or their hybrid can be used. Among different types of diversity techniques, spatial diversity is of...book chapter 2010
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- Budiarjo, I. (author), Lakshmanan, M.K. (author), Nikookar, H. (author) book chapter 2009
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- Lakshmanan, M.K. (author), Budiarjo, I. (author), Nikookar, H. (author) book chapter 2009
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Karamehmedovic, D. (author), Lakshmanan, M.K. (author), Nikookar, H. (author)Wavelet Packet based Multi-Carrier Modulation (WPMCM) offers an alternative to the well-established OFDM as an efficient multicarrier modulation technique. It has strong advantage of being a generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements and constraints of an advanced...journal article 2009
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Lakshmanan, M.K. (author), Nikookar, H. (author)The growing popularity of wireless applications has placed enormous burden on valuable resources such as spectral bandwidth. This has brought about a major revamp of traditional resource allocation policies culminating in an explosion of research activity in the field of cognitive radio (CR) (Mitola, Cognitive radio: an integrated agent...journal article 2009
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Lakshmanan, M.K. (author), Nikookar, H. (author)Ultra wideband (UWB) wireless systems are highly susceptible to interference from other services. To reduce the effect of interference from co-existing sources such as the WLAN standard IEEE 802.11a on UWB Communication, the construction of a modified template waveform using multi-carrier sinusoids is proposed in Ohno and Ikegami (2003), Ohno et...journal article 2009
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- Budiarjo, I. (author), Nikookar, H. (author), Ligthart, L.P. (author) journal article 2008
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Irahhauten, Z. (author), Dacuna, J. (author), Janssen, G.J.M. (author), Nikookar, H. (author), Yarovoy, A.G. (author), Ligthart, L.P. (author)Ultrawideband (UWB) technology is an attractive alternative for short-range applications, e.g., wireless personal area networks. In these applications, transmit and receive antennas are very close to each other and the far-field condition assumed in most of the link budget models may not be satisfied. Under near-field conditions, variations in...journal article 2008
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Budiarjo, I. (author), Nikookar, H. (author), Ligthart, L.P. (author)This article presents the performance comparison of TDCS and OFDM based cognitive radio for MIMO system using VBLAST receiver architecture to reconstruct the transmitted data. The interference avoidance performance in terms of BER and bitrate are improved by adding multiple antennas to the system and the use of V-BLAST technique at the receiver....journal article 2008
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- Hajian, M. (author), Nikookar, H. (author), der Zwan, F. (author), Ligthart, L.P. (author) journal article 2005
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- Irahhauten, Z. (author), Nikookar, H. (author), Janssen, G.J.M. (author) journal article 2004
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- Nikookar, H. (author), Lidsheim, K.S. (author) journal article 2002
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- Nikookar, H. (author), Hashemi, H. (author) journal article 2000
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- Nikookar, H. (author) doctoral thesis 1995