Effective Capacity of Imperfect Adaptive Wireless Communication Systems

Abstract

This paper presents a model for the link service capacity that an imperfect adaptive radio link provides to upper layers. As the main contribution of this paper, the model includes a number of imperfections in the link adaptation chain, as well as implementation implications. The average goodput is expressed also in compact form and its dependence on the impairments is discussed using analytical, numerical, and simulations results. The model, to be used for analyses at upper layers, integrates physical channel, transceiver characteristics, and imperfections in a flexible way, by independent, separate matrices.

Characterization of the link layer service capacity of adaptive air interfaces with imperfections

“…CDF [1]. Alternatively, an effective definition could be done imposing an upper limit on the probability of spurious switching in a given time.…”

“…Consider a five-mode link-adaptive system with BPSK, QPSK, 8QAM, and 16QAM modulation schemes, and a no-transmission mode for insufficient signal quality. The same channel code (g 0 = 133 8 , g 1 = 171 8 , K = 7) is used for all modes [1]. Service requirement on the PER as e max = 10 −5 is assumed.…”

“…Continuous time models may integrate better with other fluid analytical models and are efficiently implemented in event-driven simulators. We model the presence in the M signal quality regions S with a continuous time Markov chain with infinitesimal generator Q ∈ R M ×M [1]. The assumption of Markov chain is however not needed in the generic model of Sect.…”

“…For design and performance analysis of upper layer protocols, it is important to characterize the actual link service capacity. In this paper, we look at the portion of the protocol stack below medium access control (MAC) layer [1]. The same portion of the protocol stack is covered in a link layer model, called effective capacity link model [2], which models directly few link layer parameters used in queuing analysis, without including imperfections of the physical layer or adaptation in link layer.…”

Effective Capacity in Wireless Networks: A Comprehensive Survey

“…In cellular networks, with statistical QoS provisioning, Rayleigh fading has been extensively evaluated with EC metric. In CRNs with multiple channels, prediction related to multiple interference has also been studied with Nakagami-m Networks [21], [33], [39], [57], [58], [60]- [62], [65], [77], [81], [93]- [124] Rician [42], [45], [70], [125] Log-Normal [126] Weibull [127] Generalized Fading Models [52], [128]- [131] Rayleigh Fading Channels [6], [23], [26], [28], [29], [31], [32], [35], [41], [44], [49], [54], [66]- [69], [73]- [75], [79], [80], [83], [84], [132]- [218] 2D [160] Multidimensional [219] Turbulence Model [220]- [223] Gamma Fading…”