Chapter 1: Invited Addresses and Tutorials on Signals, Coding,
  Systems and Intelligent Techniques

Title: Performance Evaluation of the 802.16e Uplink in mobile fading channels

Author(s): R. Manishankar, Panagiotis Dallas, G. Karachalios, Gregory Yovanof

Address: Athens Information Technology Broadband Wireless & Sensors 19.5 km Markopoulo Avenue 19002 Peania, Greece | Intracom S.A., Telecom Industry, Emerging Technologies and Markets P.O Box 68, 19002 Peania, Greece | Intracom S.A., Telecom Industry, Emerging Technologies and Markets P.O Box 68, 19002 Peania, Greece | Athens Information Technology Broadband Wireless & Sensors 19.5 km Markopoulo Avenue 19002 Peania, Greece

Reference: 12th International Workshop on Systems, Signals and Image Processing pp. 239 - 243

Abstract/Summary: This paper presents the results of an end to end performance evaluation of broadband wireless access systems in mobile fading channels. A model of an OFDM system that has been proposed for broadband wireless access in the context of the IEEE 802.16e group is used to study the performance of the up-link functionality when the user mobility varies from the pedestrian speed of 3 km/hr up to vehicular speeds of 150 km/hr. The effect of mobile fading is modeled after the UMTS Channel A. In order to mitigate the effects of the broadband fading channel, a concatenated FEC scheme comprising of an RS block code and a Convolutional code is employed in the baseband system. An equalizer is used in the receiver to compensate for the channel effects using a Least-Squares channel estimator. Bit Error Rate (BER) and Error Vector Magnitude (EVM) analyses are done for QPSK and 16-QAM modulations with different coding rates and for mobile channels operating in the above vehicular environments.

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