A new blind channel shortening for differential encoded OFDM system

Jabeur, Taoufik Ben; Abed-Meraim, Karim; Boujemâa, Hatem

doi:10.1109/spawc.2008.4641664

Cited by 2 publications

(1 citation statement)

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“…To preserve a high effective flow and to eliminate the IBI and ISI, channel shortening techniques are traditionally used to reduce the channel size at the GI length in SISO and MIMO systems. Recently, in [2,3], the authors considered a block differential encoded SISO-OFDM system where they exploit the knowledge and specific characteristics of the first emitted symbol for channel shortening. The main advantage of the latter technique is its low complexity as compared to other shortening techniques.…”

Section: Introductionmentioning

confidence: 99%

Channel shortening in OFDM system using differential space-frequency block encoding

Jabeur

Abed-Meraim

Bonnet

et al. 2010

2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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Alamouti code with differential encoding has been recently proposed for OFDM systems. It allows full-rate and full-diversity communication and can be decoded with a linear complexity when using two transmit and one receive antennas. However, these advantages assume no interbloc interference (IBI) and no intersymbol interference (ISI) which occur only if the Guard Interval (GI) size is larger than the channel length. In order to relax this condition and to increase the effective flow, we adopt firstly linear channel shortening techniques to reduce the length of the channel at the length of the GI. We show here that this technique is not efficient for a 2 × 1 system and we propose a new non linear method based on the knowledge of the first emitted symbol.

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Section: Introductionmentioning

confidence: 99%