tailieunhanh - Báo cáo hóa học: " Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems Hendrik Schoeneich and Peter Adam Hoeher"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems Hendrik Schoeneich and Peter Adam Hoeher | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article iD81729 Pages 1-15 DOI ASP 2006 81729 Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems Hendrik Schoeneich and Peter Adam Hoeher Information and Coding Theory Lab Faculty of Engineering University of Kiel Kaiserstrasse 2 24143 Kiel Germany Received 1 June 2005 Revised 22 May 2006 Accepted 4 June 2006 Channel estimation schemes suitable for interleave-division multiple access IDMA systems are presented. Training and data are superimposed. Training-based and semiblind linear channel estimators are derived and their performance is discussed and compared. Monte Carlo simulation results are presented showing that the derived channel estimators in conjunction with a superimposed pilot sequence and chip-by-chip processing are able to track fast-fading frequency-selective channels. As opposed to conventional channel estimation techniques the BER performance even improves with increasing Doppler spread for typical system parameters. An error performance close to the case of perfect channel knowledge can be achieved with high power efficiency. Copyright 2006 H. Schoeneich and P. A. Hoeher. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Spread-spectrum multiple access is a popular technique allowing several users to share the same bandwidth at the same time. Spread spectrum is often equated with direct-sequence code-division multiple access DS-CDMA where data detection is based on orthogonal or near-orthogonal spreading sequences. In 1-3 a spread-spectrum technique without the need for spreading sequences has been proposed. In this technique data separation is based on chip-level interleavers. Therefore we refer to it as interleave-division

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