Spatial Channel Characterization for Smart Antenna Solutions in FDD Wireless Networks

Beach, M.A.; Allen, Ben; Karlsson, Peter

doi:10.1109/tap.2003.820948

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…This is in agreement with measurements in [26], [27]. Only when 50 m does the diffraction loss reduce the VP path contribution so that a terrain-scattered path can be of the same order of magnitude or greater.…”

Section: B Multipath Fadingsupporting

confidence: 92%

The Influence of Terrain Scattering on Radio Links in Hilly/Mountainous Regions

Han

Bertoni

2013

IEEE Trans. Antennas Propagat.

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Current rural propagation models only consider paths (direct, ground reflected, terrain diffracted, troposphere scattered) that lie in the vertical plane containing the transmitter and receiver. This paper shows that nonspecular scattering from terrain can give significant additional contributions to the received signal in hilly/mountainous environments. To show this, we have carried out Monte Carlo simulations of scattering in many different types of rural regions. These simulations model scattering using the bi-static radar equation with a Lambert's law coefficient. In order to permit simulations for many radio links and many terrain databases, we have developed a novel algorithm to rapidly search for terrain scattering elements that are visible to both the transmit and receive antennas. Results show that in sufficiently rugged terrain, the scattered paths can give a greater contribution to received power than vertical plane paths in more than 80% of links. Conclusions are drawn for radio channel characteristics, such as angle spread and short-term spatial fading. Statistical models dependent on terrain variation for path loss, and temporal response are also developed.Index Terms-Mountainous terrain, path loss model, rural propagation, tapped delay line, terrain scattering, viewshed.

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Section: B Multipath Fadingsupporting

confidence: 92%

The Influence of Terrain Scattering on Radio Links in Hilly/Mountainous Regions

Han

Bertoni

2013

IEEE Trans. Antennas Propagat.

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“…In order to use this technology, channel information determined by the receiving unit (e.g., mobile) must be fed back to the transmitting unit. An underlying problem is that channel information determined at one FDD frequency is not applicable to the other frequency [3]. However, there may be a relationship between the second order statistics at the two frequencies.…”

Section: Joint Sector Processingmentioning

confidence: 99%

An Experimental 8x8 System Used to Characterize the Spatial Channel at 3.5 GHz

Desai

Kepler

Stone

et al. 2008

2008 IEEE 68th Vehicular Technology Conference

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Motorola Labs has developed a 20 MHz experimental wide-area mobile multi-antenna system with which to characterize the spatial channel. This system transmits OFDM waveforms from an eight-element array in each of three sectors at the base to an eight-element mobile receive array. In addition, two carrier frequencies are simultaneously transmitted and received, thus providing both FDD and TDD data. The received waveforms are post-processed to extract various channel characteristics such as time of arrivals (TOAs), Doppler frequencies (DFs), and directions of departure (DODs) at the base. This paper describes key components and parameters of this system and describes the spatial characteristics uncovered from the collected field data.

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“…Transmit, or downlink beamforming, provides additional challenges to the system designer when operating a frequencydivision duplex (FDD) system [21], [22]. By way of an alternative to the fully adaptive computationally intensive downlink beamforming approaches that are necessary when operating over large FDD frequency offsets, a switched-beam system is considered in this contribution.…”

Section: (B)mentioning

confidence: 99%