On preambles with low out of band radiation for channel estimation

摘要

We investigate preamble designs for channel estimation that jointly address the estimation efficiency and the out of band (OOB) radiation of the transmit preambles. Accordingly, we provide two novel techniques for obtaining preambles for a single carrier system. Furthermore, we give a juxtaposition based method to extend their application to multi-carrier systems. The obtained preambles have 10 dB to 35 dB lower OOB radiation than the existing preamble based estimation techniques in literature. We also bring out the fundamental trade-off that exists between the estimation efficiency and the OOB radiation power, and highlight that the improved OOB performance comes at a cost of increased estimation error. Finally, as a case study, we study the performance of the obtained preambles in a multiple input multiple output (MIMO) Generalized Frequency Division Multiplexing ( GFDM) system, aimed for transmit diversity. (C) 2018 Elsevier B.V. All rights reserved.