A radio channel emulator for WCDMA, based on the hidden Markov model (HMM)

Abstract. This paper covers the main issues that must be solved in order to design and analyse the performance of Wireless Personal Area Networks (WPANs) with the aid of simulation tools. We review state-of-the-art channel models to account for small-and large-scale propagation conditions in waveform-and system-level simulations. When dealing with waveform simulations, we also look at Montecarlo and importance sampling techniques that allow efficien estimation of error probabilities. Additionally, discrete channel models are introduced to efficientl link both waveform-and system-level approaches and we point out some methods to obtain the model parameters that are suitable for the wireless environment. The discussion of these techniques is complemented with two application examples that show the use of the different simulation levels for system design and performance study. With the paradigm of Bluetooth piconets we illustrate the usefulness of discrete channel models and we consider the design of an OFDM-based WPAN system to exemplify simulation from a waveform-level point of view.

show abstract

“…Some other examples of the use of HMMs for the simulation of wireless systems, not specificall WPANs though, can be found in [16][17][18].…”

Section: B L Ue T O O T H P I Conetsmentioning

confidence: 99%

Modelling, Performance Analysis and Design of WPAN Systems

Armada

Rodríguez

Jiménez

et al. 2006

Wireless Pers Commun

View full text Add to dashboard Cite

show abstract

“…That is, for each testing scenario, the Markov chains are properly trained through adequate offline simulations, which reproduce (in terms of error distribution) the statistical behavior of the radio channel. Once this statistical behavior is known, the parameters of the HMM of the RTE must be properly tuned to reproduce this behavior with enough accuracy from a statistical viewpoint [3]. This approach allows the emulation of a great number of scenarios with different propagation conditions, environments (macrocell, microcell), mobile terminal speed, etc., provided that they are trained properly.…”

Section: Introductionmentioning

confidence: 99%

An emulator framework for a new radio resource management for QoS guaranteed services in W-CDMA systems

Sallent

Perez-Romero²,

Casadevall³

et al. 2001

IEEE J. Select. Areas Commun.

View full text Add to dashboard Cite

In the context of third-generation (3G) systems a mix of services with different requirements are expected. Consequently, packet scheduling mechanisms for quality of service (QoS) guarantees will play a key role. This paper proposes a new scheduling strategy that makes consistent the target quality in the radio link with the priority level assigned to each user. The performance of such a strategy is assessed by system level simulations and, in order to gain more insight into the difficulties of this optimization problem, it is compared to other alternatives. This work is part of the Wineglass project, within the Fifth Framework Program of the European Commission (IST), where a real time demonstrator including the radio resource management tasks is being developed. Thus, an implementation approach of the proposed scheduling is also described. The implementation is based on lookup tables and this approach is validated by simulation.

show abstract

“…The retransmission process is modeled using the BaumWelch algorithm [8]: at the target BER (bit error rate) of 10-6 the transmission chain randomizes quite well the residual error process at PDU level [9] and the retransmission protocol may be characterized using a simple two states Markov model; this does not hold for the error process at bit level and may not be considered correct when BER approaches 10-4, involving a dramatically increased number of states (at least 8 according to [10]). PDU error sequences can be easily post-processed and feed the simulation of any retransmission protocol.…”

Section: Simulations and Resultsmentioning

confidence: 99%

Evaluation of Resiliency Solutions for Real-Time Multimedia Streams in a UTRAN Scenario

Scopigno

Belfiore

Lanati³

et al.

2005 5th International Conference on Information Communications &Amp; Signal Processing

View full text Add to dashboard Cite

UMTS, as a third generation mobile communications system, has been developed to offer, in addition to traditional basic services -such as voice telephony -, broader data connections and multimedia services. Channel reliability, the most common problem affecting mobile communications, strongly influences such new services and, in particular, the quality of multimedia streams. Nevertheless, current solutions do not foresee resiliency mechanisms suitable for real-time applications.In this paper we evaluate the benefits and effects of some resiliency tools onto the final quality of real-time multimedia streams in a UTRAN scenario: the proposed solutions span from FEC and ARQ to redundant video-information and enhanced packet-queue management. The analysis is performed by means of simulations modeling UTRAN FDD mode, with error events at the PDU level (simulated by means of a hidden Markov model).

show abstract

A radio channel emulator for WCDMA, based on the hidden Markov model (HMM)

Abstract: Abstract

Cited by 9 publications

References 2 publications

Modelling, Performance Analysis and Design of WPAN Systems

Modelling, Performance Analysis and Design of WPAN Systems

An emulator framework for a new radio resource management for QoS guaranteed services in W-CDMA systems

Evaluation of Resiliency Solutions for Real-Time Multimedia Streams in a UTRAN Scenario

Contact Info

Product

Resources

About