Efficient Receiver Implementation for Mobile Applications

Efficient Receiver Implementation for Mobile Applications

Costas Chaikalis (TEI of Larissa, Greece) and Felip Riera-Palou (University of the Balearic Islands, Spain)
DOI: 10.4018/978-1-60566-108-7.ch013
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Abstract

Modern and future wireless communication systems such as UMTS and beyond 3G systems (B3G) are expected to support very high data rates to/from mobile users. This poses important challenges on the handset design as they should be able to attain an acceptable operating bit error rate (BER) while employing a limited set of resources (i.e. low complexity, low power) and often, with tight processing delay constraints. In this chapter we study how channel decoding and equalisation, two widely used mechanisms to combat the deleterious channel effects, can be made adaptable in accordance to the instantaneous operating environment. Simulation results are given demonstrating how receiver reconfigurability is a promising method to achieve complexity/delay efficient receivers while maintaining prescribed quality of service (QoS) constraints.
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Efficient 3G Turbo Decoder In Indoor/Low Range Outdoor Environment

Turbo Codes

Turbo codes (Berrou, 1996) represent a powerful channel coding technique. Universal Mobile Telecommunications System (UMTS) belongs to the third generation (3G) of mobile communication systems. Turbo codes have been incorporated as a channel coding scheme in UMTS for data rates higher or equal to 28.8 kbps (Holma, 2000). They also provide high coding gains in flat fading channels with the use of outer block interleaving (Woodard, 2000; Hall, 1998). Soft-input/soft-output (SISO) decoder is part of a turbo decoder and two candidate algorithms to be used in a SISO decoder are soft output Viterbi algorithm (SOVA) and log maximum a-posteriori (log-MAP) algorithm (Woodard, 2000; Robertson, 1995; Hagenauer, 1989; Pietrobon, 1998).

Dynamic reconfiguration in cellular networks is a popular topic in published literature (Kotsopoulos, 1991; Kotsopoulos, 1992), while different propagation (mobile channel) issues, tested by experimental procedures, have been presented in Bouzouki (2001), Ioannou (2004) and Kitsios (2005). A reconfigurable turbo decoder can be derived according to the common operations of the two algorithms, optimal in terms of performance and latency (Chaikalis, 2003; Chaikalis, 2004; Chaikalis, in press). We consider just SOVA and log-MAP and not other turbo decoding algorithms like max-log-MAP or MAP, because SOVA is better in terms of delay, while log-MAP is better in terms of performance (Woodard, 2000; Robertson, 1995).

Key Terms in this Chapter

Soft Output Viterbi Algorithm (SOVA): A modified version of well known Viterbi algorithm, which is used for turbo decoding. Generally is less powerful than log-MAP, but less complex.

Turbo Decoder: In the communications literature a turbo decoder represents an iterative procedure used at the receiver to compensate the channel effects.

Adaptive Algorithm: Algorithm used to drive the coefficients of an adaptive filter (such as an adaptive equaliser) to a set of values minimising some prescribed error function.

Adaptive Equaliser: Digital equaliser whose coefficients can vary in response to variations of the channel.

Least Mean Squares (LMS): A computationally simple yet powerful adaptive algorithm based on gradient descent.

Log Maximum A Posteriori (log-MAP): A simplified powerful version of well known MAP algorithm, which is used for turbo decoding and is based on a posteriori probabilities.

Reconfigurable Equaliser: Equaliser whose structural properties like for example its length, can vary in response to changes in the environment conditions.

Universal Mobile Telecommunications Standard (UMTS): A high data rate 3G mobile communications standard already available in market.

Reconfigurable Turbo Decoder: Turbo decoder whose structural properties like for example its decoding algorithm, can vary according to the required quality of service.

Equaliser: In the communications literature, an equaliser is a filter (fixed or adaptive) used at the receiver to compensate the channel effects.

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Editorial Advisory Board
Table of Contents
Foreword
Robert A. Walker, Drew Parker
Preface
Stavros Kotsopoulos, Konstantinos Ioannou
Acknowledgment
Chapter 1
Dzmitry Kliazovich, Michael Devetsikiotis, Fabrizio Granelli
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Chapter 2
Dimitris Toumpakaris, Jungwon Lee
This chapter presents an introduction to cross-layer scheduling and resource allocation for wireless systems and an overview of some of the... Sample PDF
Cross-Layer Resource Allocation and Scheduling for Wireless Systems
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Chapter 3
Prashant Pillai
IP multicast mechanisms provide efficient bandwidth consumption and distribution of high volume contents such as audio/video streaming... Sample PDF
An AAA Framework for IP Multicast Communication in Next Generation Networks
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Chapter 4
N. Merlemis, D. Zevgolis
This chapter is an introduction of the Wavelength-division multiplexing (WDM) technologies (such as Dense WDM and coarse WDM) and their recent... Sample PDF
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Chapter 5
Sotiris Karabetsos, Spiros Mikroulis, Athanase Nassiopoulos
The high capacity offered by the optical fiber, combined with the mobility and the flexibility of wireless access, either fixed or not, provides an... Sample PDF
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Chapter 6
Konstantinos Birkos
High Altitude Stratospheric Platforms (HASPs) have gained much of attention from the scientific society and the communication industry in the recent... Sample PDF
High Altitude Stratospheric Platforms (HASPs)
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Chapter 7
Dimitrios K. Lymberopoulos
The Next Generation Network (NGN) is a very complex environment, where various parties (network operators, services and application providers... Sample PDF
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Chapter 8
Konstantinos S. Kotsopoulos
Next Generation Networks (NGNs) will accommodate heterogeneous architectures that need to be managed in order to provide services with high QoS to... Sample PDF
The Adoption of Service-Oriented Architecture (SOA) in Managing Next Generation Networks (NGNs)
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Chapter 9
Ioannis Papapanagiotou, Georgios S. Paschos
The present chapter contains a thorough investigation of Quality of Service, Energy Conservation and mobility in 802.11 and 802.16 standards.... Sample PDF
A Case Study on the QoS, Energy Consumption and Mobility of WLANs and WMANs
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Chapter 10
Panagiotis Kasimatis, Dimitra Varla
This chapter deals with the description of the various applied Mobile System Architectures, showing the evolution path towards the IP Convergence... Sample PDF
Mobile Telecom System Architectures—IMS an Evolution Path Towards IP Convergence
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Chapter 11
Peter Brida, Peter Cepel, Jan Duha
This chapter deals with mobile positioning in wireless heterogeneous next generation networks. Positioning process is analyzed and the chapter gives... Sample PDF
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Chapter 12
Anthony Ioannidis, Jiorgis Kritsotakis
Convergence in the communication industry is a reality – networks are being integrated, digital devices are being unified, and organizations seeking... Sample PDF
Converged Networks and Seamless Mobility: Lessons from Experience
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Chapter 13
Costas Chaikalis, Felip Riera-Palou
Modern and future wireless communication systems such as UMTS and beyond 3G systems (B3G) are expected to support very high data rates to/from... Sample PDF
Efficient Receiver Implementation for Mobile Applications
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Chapter 14
Apostolos Georgiadis, Carles Fernández Prades
Multi-antenna systems incorporating smart antenna techniques present numerous advantages compared to their single antenna counterparts including... Sample PDF
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Chapter 15
Stelios A. Mitilineos, Christos N. Capsalis, Stelios C.A. Thomopoulos
Small-scale fading strongly affects the performance of a radio link; therefore radio channel simulation tools and models are broadly being used in... Sample PDF
Simulation of Small-Scale Fading in Mobile Channel Models for Next-Generation Wireless Communications
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Chapter 16
Petros Karadimas
This chapter studies a composite stochastic model, in which the diffuse component arises from three dimensional (3-D) multipath scattering. That... Sample PDF
Stochastic Modeling of Narrowband Fading Channels with Three Dimensional Diffuse Scattering
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Chapter 17
Anastasios Papazafeiropoulos
As a consequence of the growing interest in wireless communications systems, much effort is being devoted to the channel characterization and... Sample PDF
Channel Characterization and Modelling for Mobile Communications
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Chapter 18
Fotis C. Kitsios, Spyros P. Angelopoulos, John Zannetopoulos
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Chapter 19
Spyros P. Angelopoulos, Fotis C. Kitsios, Eduard Babulak
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Chapter 20
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Chapter 21
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Chapter 22
Achilles D. Kameas
This chapter describes a human centric approach for designing and deploying ubiquitous computing applications. These are considered as activity... Sample PDF
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Chapter 23
Eduard Babulak, Konstantinos G. Ioannou, Athanasios Ioannou
Transportation and Internet Technologies have evolved dramatically during the last decade, laying solid foundation for the future generation of the... Sample PDF
Channel Management Schemes to Support Services in Ubiquitous Communications Infrastructures for Future Transportation Technologies
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