Capture probability in Rician fading channels with power control in the transmitters

García, Jaime Sánchez; Smith, David R.

doi:10.1109/tcomm.2002.806541

Cited by 20 publications

(22 citation statements)

References 6 publications

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“…The capture effect is a common phenomenon in wireless networks. There are two models for analyzing the capture effect [24][25][26]. In the first model, the capture effect occurs when the received signal power which comes from one transmitter is greater than each of the other interferer's power by a minimum threshold factor z, which is called the capture ratio.…”

Section: Capture Probabilities Under Different Fading Channelsmentioning

confidence: 99%

Capture Effect in the FSA-Based Networks under Rayleigh, Rician and Nakagami-m Fading Channels

2018

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Framed slotted aloha (FSA) is a multiple access protocol widely used in wireless communication for its simplicity and effectivity. The theoretical maximum channel utilization of FSA is approximately equal to 0.37 irrespective of the capture effect. In fact, the capture effect is a common phenomenon in wireless communication, which can increase the channel utilization. In this paper, we derive the closed-form expressions of capture probabilities under Rayleigh, Rician and Nakagami-m fading channels, respectively, and further give the optimal frame length which maximizes the channel utilization in the FSA-based networks. The numerical results are given for indicating the capture probabilities under different fading channels and their impacts on the optimal frame length and the maximum channel utilization.

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Section: Capture Probabilities Under Different Fading Channelsmentioning

confidence: 99%

Capture Effect in the FSA-Based Networks under Rayleigh, Rician and Nakagami-m Fading Channels

2018

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“…Then, massive MIMO channel can therefore propagate jointly with both non-LOS (NLOS) and LOS channel. Such that the phases and transmit powers are combined, thus the mean power of the Ricean fading channel is obtained [7]. The performance of massive MIMO HetNet can be analyzed in the uncorrelated Rayleigh channel and uncorrelated Ricean MIMO channel.…”

Section: Related Workmentioning

confidence: 99%

“…where step (a) follows from substituting (19) and rearranging the terms, the integral is taken over non-negative integer t. Now in (23), the area spectral efficiency is evaluated with ϕ o (r o ) (8) over received power (7) at the user location and Ricean channel gain. Then, to further improve the overall performance, we design macro BSs cooperation approach to jointly control power in (7), especially at the cell edge. The next section focuses on developing a beamform coordination approach.…”

Section: Area Spectral Efficiencymentioning

confidence: 99%

A Performance Study of Massive MIMO Heterogeneous Networks with Ricean/Rayleigh Fading

Nyarko¹,

Mbom²

2018

Preprint

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The unprecedented demand for services and applications, coupled with large network architecture calls for a radical melioration in evolving wireless networks. Massive multiple-input and multiple-out (massive MIMO) systems, small cell networks (SCN) and Heterogeneous networks (HetNet) are envisioned to meet the new quality of service (QoS) objectives of evolving networks. In this paper, we investigate massive MIMO with HetNet, where the intended macro BS signal follows Ricean fading and interfering Femto BS signals follow Rayleigh fading. Subject to the Ricean assumption, strong line-of-sight (LOS) channel exists in the coverage area, when the high power macro BS is mounted at a high altitude. Then, by exploiting matrix and stochastic geometric tools, we evaluate the signal-to-interference (SIR). And obtain QOS objectives: coverage and outage probabilities, and area spectral efficiency (ASE). Further, we investigate the role of multiple antenna system in improving the SIR. This involves massive MIMO beamforming coordination of the macro BSs through power control with max-min optimization for users at the cell-edge. Numerical results show that the coverage and outage performance converge for different user locations, pathloss and Ricean factor. Also, the monotonic increase in Ricean factor improves the SIR of a user located within coverage region. That is, a user is in an outage at a distance where the Ricean factor is very small. And, optimal macro BS antennas and Ricean factor that achieve the ASE performance guarantee a rate-fairness between the cooperating macrocells, and avoid strong Ricean channel correlation. The performance gain is dependent on Ricean factor and user location, but independent of cell size.

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“…The probability density function for the received power (p) in a Ricean fading channel is given by [10] …”

Section: The Fading Channelmentioning

confidence: 99%

An Enhanced Routing Metric for Fading Wireless Channels

Cunha

Duarte

Pujolle

2008

2008 IEEE Wireless Communications and Networking Conference

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Abstract-In this paper we propose the enhancement of routing metrics through a more complete view of the physical channel. Using cross-layer optimizations, we develop the Distribution Based Expected Transmission Count (DBETX), which improves the performance of the network in the presence of varying channels. Through observations of the wireless link, the nodes are able to estimate how the wireless link behaves. The proposed metric exploits this estimation to increase routing efficiency. The proposed metric is shown to outperform the conventional ETX metric in the presence of fading. The improvement over ETX increases with the network density because connectivity increases and more routing options become available. Results show a reduction of up to 26% in the Average Number of Transmissions per link and an increase of up to 32% in the end-to-end route availability.

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Capture probability in Rician fading channels with power control in the transmitters

Cited by 20 publications

References 6 publications

Capture Effect in the FSA-Based Networks under Rayleigh, Rician and Nakagami-m Fading Channels

Capture Effect in the FSA-Based Networks under Rayleigh, Rician and Nakagami-m Fading Channels

A Performance Study of Massive MIMO Heterogeneous Networks with Ricean/Rayleigh Fading

An Enhanced Routing Metric for Fading Wireless Channels

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