Proceedings ArticleDOI
Evaluation of optimum diversity combining in DECT
Jeroen Wigard,Preben Mogensen,F. Frederiksen,O. Norklit +3 more
- Vol. 2, pp 507-511
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TLDR
Simulation results show that optimum diversity combining is only useful for a TDD system with a short dwell time, and in the uplink direction M-1 interferers can be suppressed by an M element array.Abstract:
Optimum diversity combining in a wireless communications system using TDMA/TDD is considered. By the use of optimum diversity combining a receiving antenna array is able to suppress interference and thus the capacity of the system is increased. The results in this paper are obtained by simulations. In the simulations a DECT-like system is used as the TDMA/TDD system. The results show that in the uplink direction M-1 interferers can be suppressed by an M element array. However the downlink transmit diversity performance is much worse, due to the changes in the radio channel during the dwell time between the uplink and downlink burst. That is the reason why it is concluded that optimum diversity combining is only useful for a TDD system with a short dwell time.read more
Citations
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Journal ArticleDOI
Applications of antenna arrays to mobile communications. I. Performance improvement, feasibility, and system considerations
TL;DR: This paper presents an overview of mobile communications as well as details of how an array may be used in various mobile communications systems, including land-mobile, indoor-radio, and satellite-based systems.
Journal ArticleDOI
Spatial covariance based downlink beamforming in an SDMA mobile radio system
C. Farsakh,Josef A. Nossek +1 more
TL;DR: An approach to jointly calculate weights in such a way that all users receive their signal with a given signal-to-noise-and-interference ratio by minimizing the array transmit power while spatially separating the users.
Book ChapterDOI
Optimum and Suboptimum Transmit Beamforming
Mats Bengtsson,Bjorn Ottersten +1 more
TL;DR: In this paper, it was shown that the spatial signature of the downlink is identical to that of the uplink, as long as the delay between uplink and downlink time slots is short compared with the coherence time of the channel.
Mobile cellular communications with base station antenna arrays
TL;DR: In this paper, the authors deal with the problem of increasing the spectrum effliency of cellular systems by the use of antenna array base stations, and the focus of the thesis is on downlink transmission in frequency band.
Journal ArticleDOI
Maximizing the SDMA Mobile Radio Capacity Increase by DOA Sensitive Channel Allocation
Christof Farsakh,Josef A. Nossek +1 more
TL;DR: The simulated blocking probabilities are then used to predict the capacity increase which can be expected after adding an SDMA component to a conventional mobile radio system.
References
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Book
Introduction to Adaptive Arrays
TL;DR: This second edition is an extensive modernization of the bestselling introduction to the subject of adaptive array sensor systems, taking the reader by the hand and leading them through the maze of jargon that often surrounds this highly technical subject.
Journal ArticleDOI
Optimum Combining in Digital Mobile Radio with Cochannel Interference
TL;DR: Analytical and computer simulation techniques are used to determine the performance of optimum combining when the received desired and interfering signals are subject to Rayleigh fading, and results show that optimum combining is significantly better than maximal ratio combining even when the number of interferers is greater than thenumber of antennas.
Journal ArticleDOI
Optimum combining in digital mobile radio with cochannel interference
TL;DR: In this paper, the authors used analytical and computer simulation techniques to determine the performance of optimum combining when the received desired and interfering signals are subject to Rayleigh fading, and they showed that optimum combining is significantly better than maximal ratio combining even when the number of interferers is greater than number of antennas.
Journal ArticleDOI
Signal acquisition and tracking with adaptive arrays in the digital mobile radio system IS-54 with flat fading
TL;DR: In this paper, the performance of the least-mean-square (LMS) and direct matrix inversion (DMI) algorithms in the North American digital mobile radio system IS-54 was investigated.
Journal ArticleDOI
An adaptive array in a spread-spectrum communication system
TL;DR: The combined system provides the interference protection of the adaptive array during the code timing acquisition phase as well as after code lockup and requires only very modest spectrum-spreading ratios for the adaptive arrays to null interference.