Traffic improvements in wireless communication networks using antenna arrays

Razavilar, J.; Rashid-Farrokhi, F.; Liu, K.J.R.

doi:10.1109/49.840204

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…We extend this approach to derive an approximation for two-fold SDMA blocking probabilities, which reduces the burden of computing the SDMA blocking probability. According to [14], the Erlang-B model discussion from Section 3.1 should be modified to correctly represent the new SDMA traffic. A new Markov chain model for twofold SDMA system is shown in Figure 5 [15].…”

Section: One-dimensional Approximate Markov Chain Modelmentioning

confidence: 99%

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Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

Huang

Doherty

2005

Wireless Pers Commun

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Spectrum efficiency is a constant challenge in the design of wireless networks. Space-division-multipleaccess (SDMA) is a promising approach to achieve higher spectral efficiency which reuses bandwidth via multiplexing signals based on their spatial signature. Several different studies have shown that SDMA can effectively improve system capacity in a mobile environment. In this paper, we present a new Markov chain traffic model for a duplicate-at-last (DL) approach [IEE Proceedings on Communication 146 (1999) 303] in two-fold and three-fold SDMA systems. Simplified blocking probability formulations for two-fold and three-fold SDMA are also derived. Simulations based on a common method of spatial separation check for channel allocation in SDMA are presented to evaluate the probability of successfully creating two-fold and three-fold SDMA channels. The simulation, as well as analytical, results indicate that the SDMA system can reduce the blocking probability of the calls and result in more traffic loading than a traditional cellular system. The results also show that our simplified approaches not only can reduce the computational complexity, but can also accurate approximate two-fold and three-fold SDMA performance.

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Section: One-dimensional Approximate Markov Chain Modelmentioning

confidence: 99%

“…Research in [14] uses a one-dimensional Markov chain model to represent handover traffic in wireless communications. We extend this approach to derive an approximation for two-fold SDMA blocking probabilities, which reduces the burden of computing the SDMA blocking probability.…”

Section: One-dimensional Approximate Markov Chain Modelmentioning

confidence: 99%

Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

Huang

Doherty

2005

Wireless Pers Commun

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“…Because of the limited frequency spectrum for satellite communications, it is very important to improve the spectrum efficiency to enhance the system capacity. The smart antenna technology becomes one of the most promising approaches to improve the capacity of wireless communication systems, since a smart antenna can formulate multiple beams to realize the space division multiple access (SDMA) by dividing the service area into a large number of cells, and each cell is served by one beam [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of digital beamforming strategies for satellite communications

Huang

Leung

2004

IEEE Trans. Aerosp. Electron. Syst.

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Smart antennas are becoming one of the promising technologies to meet the rapidly increasing demands for more capacity of satellite communication systems. A main component in a smart antenna system is beamforming. Because of the limitations of analog beamforming, digital beamforming will be employed in future satellite communication systems. We evaluate the performance of various digital beamforming strategies proposed in the literature for satellite communications: 1) single fixed beam/single user, 2) single fixed beam/multiple users, 3) single adaptive beam/single user, and 4) single Chebyshev dynamic beam/multiple users. Multiple criteria including coverage, system capacity, signal-to-interference-plus-noise ratio (SINR), and computation complexity are used to evaluate these satellite communication beamforming strategies. In particular, a Ka-band satellite communication system is used to address the various issues of these beamforming strategies. For the adaptive beamforming approach, subarray structure is used to obtain the weights of a large 2D antenna array, and a globally convergent recurrent neural network (RNN) is proposed to realize the adaptive beamforming algorithm in parallel. The new subarray-based neural beamforming algorithm can reduce the computation complexity greatly, and is more effective than the conventional least mean square (LMS) beamforming approach. It is shown that the single adaptive beam/single user approach has the highest system capacity.

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“…Only lately has this subject been addressed. 9 The effect of adaptive beamforming on the queuing model of the cell is represented by a parameter in the final cell model. A quite complex expression for the outage probability was obtained in terms of the probability of successful admission to the system, which was only found through simulation.…”

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confidence: 99%

Teletraffic capacity of CDMA cellular mobile networks and adaptive antennas

Al-Ruwais

2002

Int J Network Mgmt

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The teletraffic capacity of a CDMA mobile network with adaptive antennas at the receiver base station is considered and a simplified expression for the system outage probability associated with the teletraffic capacity is obtained. Analytical as well as numerical results show that the outage probability, and consequently the teletraffic capacity of the system, is improved using adaptive antennas at the receiver base station.

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Traffic improvements in wireless communication networks using antenna arrays

Cited by 12 publications

References 15 publications

Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

Performance evaluation of digital beamforming strategies for satellite communications

Teletraffic capacity of CDMA cellular mobile networks and adaptive antennas

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