On scalability, robustness and accuracy of physical layer abstraction for large-scale system-level evaluations of LTE networks

The use of dual polarization in mobile satellite systems is very promising as a means for increasing the transmission capacity. In this paper we study a system which uses simultaneously two orthogonal polarizations in order to communicate with the users. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable throughput gains up to 100 % when compared with the single polarization system. The gateway is allowed to vary the MIMO and Modulation and Coding Schemes for each frame. The selection is done by means of a link adaptation algorithm which uses a tunable margin to achieve a predefined target Frame Error Rate.

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“…procedure called SNR compression in [13]. The SNR γ n for each symbol period is calculated for the different MIMO modes as:…”

Section: System Modelmentioning

confidence: 99%

Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems

Tato¹,

Henarejos²,

Mosquera³

et al. 2018

Wireless and Satellite Systems

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“…• SISO: a single polarization is used. Thus, the system model is expressed as y n = h n x n + w n and therefore γ n = |h n | 2 [19], the SINR can be expressed as γ n = H n 2 /σ 2 w , where H n 2 is the Frobenius norm. • Polarization Multiplexing (PM): each polarization conveys a symbol and thus, two symbols are transmitted in each channel access.…”

Section: B Physical Layer Abstraction and Mimomentioning

confidence: 99%

Advanced signal processing techniques for fixed and mobile satellite communications

Henarejos¹,

Pérez-Neira²,

Mazzali³

et al. 2016

2016 8th Advanced Satellite Multimedia Systems Conference and the 14th Signal Processing for Space Communications Workshop (ASM

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Abstract-Enabling ultra fast systems has been widely investigated during recent decades. Although polarization has been deployed from the beginning in satellite communications, nowadays it is being exploited to increase the throughput of satellite links. More precisely, the application of diversity techniques to the polarization domain may provide reliable, robust, and fast satellite communications. Better and more flexible spectrum use is also possible if transmission and reception can take place simultaneously in close or even overlapping frequency bands. In this paper we investigate novel signal processing techniques to increase the throughput of satellite communications in fixed and mobile scenarios. First, we investigate four-dimensional (4D) constellations for the forward link. Second, we focus on the mobile scenario and introduce an adaptive algorithm which selects the optimal tuple of modulation order, coding rate, and MIMO scheme that maximizes the throughput constraint to a maximum packet error rate. Finally, we describe the operation of radio transceivers which cancel actively the self-interference posed by the transmit signal when operating in full-duplex mode.

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“…To avoid actual signal processing, in system-level simulations, a link-to-system interface composed of a suitable PHY layer abstraction is typically used. Because the parameters of the PHY abstraction models such as frequency, symbol duration, and error correcting codes do not depend on the channel models or the multi-antenna techniques employed, the SISOabstracted PHY layer can be used for MIMO configurations in the system-level simulations [21]. The goal of this PHY layer abstraction is essentially to obtain a block error rate (BLER) for a transport block (TB) without having to carry out real signal processing.…”

Section: Phy Layermentioning

confidence: 99%

“…where β FR ρ ð Þ denotes the normalized BW in the FR zone, while the other parameters are as described in (21).…”

Section: Proposed Qos-based Dynamic Ffr Schemementioning

confidence: 99%

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QoS priority-based dynamic frequency band allocation algorithm for load balancing and interference avoidance in 3GPP LTE HetNet

Kaleem

Hui

2014

J Wireless Com Network

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A 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system uses the concept of two-tier heterogeneous networks (HetNets), where low-power and short-range femtocells are laid under macrocells to fulfill the quality of service (QoS) requirements of users and to boost overall network capacity. However, co-channel interference is one of the major issues that need to be resolved for the successful deployment of HetNets. To overcome this problem, fractional frequency reuse (FFR) schemes have been proposed that can efficiently utilize the available spectrum. Nevertheless, these schemes waste limited frequency resources owing to their static allocation and lack of following QoS requirements, network loading conditions, and service priority of users. In this paper, a QoS-based dynamic FFR (QoS-DFFR) scheme is proposed that efficiently allocates the non-occupied center-zone frequency bands, i.e., bonus bandwidth (BBW), to cell-edge users by considering their QoS requirements. Consequently, the proposed QoS-DFFR scheme can optimize cell-edge user throughput and sector throughput and reduce co-channel interference by dynamically allocating the BBW to the most demanding cell-edge users. The proposed QoS-DFFR scheme improves performance because of its ability to dynamically allocate the limited portion of the frequency bands based on the service priorities of users. The system-level simulation results show that the proposed QoS-DFFR scheme performs remarkably well in a HetNet environment. Compared with the usual FFR schemes, the proposed scheme almost doubles the cell-edge user's throughput and reduces the user's packet loss rate.

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On scalability, robustness and accuracy of physical layer abstraction for large-scale system-level evaluations of LTE networks

Cited by 9 publications

References 15 publications

Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems

Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems

Advanced signal processing techniques for fixed and mobile satellite communications

QoS priority-based dynamic frequency band allocation algorithm for load balancing and interference avoidance in 3GPP LTE HetNet

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