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The potential to provide multi-gbps throughput has made 60 GHz communication an attractive choice for next-generation WLANs. Due to highly directional nature of the communication, a 60 GHz link faces frequent outages in the presence of mobility. In this work, we present a sensor-assisted multi-level codebook-based beam width adaptation and beam switching to address the mobility challenges in 60 GHz...
This paper addresses the beam pattern analysis in uncertain environment. Assuming that beamforming is achieved along one given receiver direction, the beam pattern is controlled via the sensor distribution to make different goals. Given two different applications, we show that the sensor nodes are located in a straight line perpendicular to the receiver direction, different distance between the sensors...
In this paper, we present a new scheme for uplink SIMO CDMA/TDD transmission using Pre-RAKE diversity combining and new orthogonal spreading sequences at terminal, and simple space-time array receiver at base station. Adopting techniques such as so-called zero correlation duration (ZCD) code as spreading code, chip-level beamformer (CLB) array antenna configuration, and one single matched filter for...
In spite of its proven advantage, realization of affordable multi-functional phased-arrays, combining multiple communication apertures, is hindered by size, weight, and power consumption (SWaP) and cost issues. Incremental improvements in both transmit and receive analog RF chains are being pursued. However, it is difficult to expect revolutionary advances in phased array SWaP using architectures...
A dynamic resource allocation algorithm with beam steering is evaluated for providing broadband wireless access to mobile users of the emerging IEEE 802.16 m air interface standard. Thanks to our design, the coverage area and total throughput may be significantly enhanced, compared to the current IEEE 802.16 e standard. Our proposed solution supports high mobility, improves fairness among the users...
A method is proposed to determine reset timing for phase weight recalculation required in coherent beamforming using wirelessly connected independently mobile nodes to form an array aperture. Without the tether of a wired connection, elements in an array may be independently mobile. However, coherent beam formation requires position data at time of intercept to maintain target focus. Implementing...
Applying smart antennas to the communication system with FDD mode is still a difficulty which remains to be answered, due to the existing frequency difference between uplink and downlink. In this paper, downlink beam forming was implemented in terms of transmission-receiving reciprocity theorem of antennas and receiver feedback of fade parameters. According to simulation analysis, the results reveal...
Recently, the attentions of communication societies are paid to MIMO-OFDM systems. In this paper we propose a new beamforming method to the receive end of MIMO-OFDM systems. To make the method work with fewer known OFDM symbols, oversampling samples are employed and multistage decomposition based on orthogonality of sub-carriers of OFDM signal is used to formulate the beamforming weight vector for...
This paper studies efficient complex valued matrix manipulations for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) is proposed for the inversion of large complex matrices that are based on Alamouti sub-blocks. Another method using a variant of Givens rotation is proposed for fast QR decomposition of this kind of matrices. Our solutions...
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