tailieunhanh - Báo cáo hóa học: " Timing-Free Blind Multiuser Detection for Multicarrier DS/CDMA Systems with Multiple Antennae"

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: Timing-Free Blind Multiuser Detection for Multicarrier DS/CDMA Systems with Multiple Antennae | EURASIP Journal on Applied Signal Processing 2004 5 613-628 2004 Hindawi Publishing Corporation Timing-Free Blind Multiuser Detection for Multicarrier DS CDMA Systems with Multiple Antennae Stefano Buzzi DAEIMI Universita degli Studi di Cassino Via Di Biasio 43 03043 Cassino FR Italy Email buzzi@ Emanuele Grossi DAEIMI Universita degli Studi di Cassino Via Di Biasio 43 03043 Cassino FR Italy Email Marco Lops DAEIMI Universita degli Studi di Cassino Via Di Biasio 43 03043 Cassino FR Italy Email lops@ Received 30 December 2002 Revised 30 July 2003 The problem of blind multiuser detection for an asynchronous multicarrier DS-CDMA system employing multiple transmit and receive antennae over a Rayleigh fading channel is considered in this paper. The solutions that we develop require prior knowledge of the spreading code of the user to be decoded only while no further information either on the user to be decoded or on the other active users is required. Several combining rules for the observables at the output of each receive antenna are proposed and assessed and the implications of the different options are studied in depth in terms of both detection performance and computational complexity. A closed form expression is also derived for the conditional error probability and a lower bound for the near-far resistance is provided. Results confirm that the proposed blind receivers can cope with both multiple access interference suppression and channel estimation at the price of a limited performance loss as compared to the ideal linear receivers which assume perfect channel state information. Keywords and phrases MC CDMA multiple antennae MIMO systems channel estimation timing-free detection near-far resistance. 1. INTRODUCTION Multicarrier code division multiple access MC-CDMA has been conceived as a transmission format which retains the potentials of direct sequence CDMA DS-CDMA and in particular its resistance to multipath effects .

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