Open AccessScaled‐time OFDM experiments for channels exceeding the cyclic prefix
Author(s) -
Lerch M.,
Caban S.,
Zöchmann E.,
Svoboda P.,
Rupp M.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.2857
Subject(s) - cyclic prefix , orthogonal frequency division multiplexing , relay , delay spread , channel (broadcasting) , computer science , multipath propagation , wireless , impulse (physics) , prefix , electronic engineering , impulse response , bit error rate , real time computing , telecommunications , algorithm , engineering , mathematics , physics , mathematical analysis , power (physics) , linguistics , philosophy , quantum mechanics
Wireless communications experiments at high user velocities can be performed with much less effort at lower velocities by using time‐stretching techniques. In OFDM, state‐of‐the‐art time‐stretching techniques do not consider the case of channel impulse responses exceeding the length of the cyclic prefix (CP). This is the case in any real‐world OFDM system. In particular, multipath scenarios caused by relay nodes commonly found in public railways have a late, strong channel tap. In this work, the authors propose a time‐stretching technique that preserves the effects of the insufficient CP with negligible error and without channel knowledge.