Periodic Spectrum Transmission for Single-Carrier Transmission Frequency-Domain Equalization

Fumiaki MAEHARA  Satoshi GOTO  Fumio TAKAHATA  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.6   pp.1407-1414
Publication Date: 2007/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.6.1407
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
single-carrier (SC) transmission,  frequency-domain equalization (FDE),  even-numbered samples,  frequency diversity,  high-level modulation,  

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This paper proposes a frequency diversity scheme using only even-numbered samples for single-carrier transmission with frequency-domain equalization (SC-FDE). In the proposed scheme, a periodical frequency spectrum generated by using only even-numbered samples in the time domain provides the frequency redundancy, which is utilized for frequency diversity. Moreover, in order to avoid the data rate reduction due to the decrease in the samples within one block, the high-level modulation is applied to each sample and the transmitting power of each sample can be doubled for the equivalent power transmission instead. Computer simulation results show that the proposed scheme provides a steeper BER curve than the typical SC-FDE over frequency selective fading channels, while the typical SC-FDE is more favorable than the proposed scheme over flat fading channels. Moreover, the proposed scheme still retains its characteristic even when channel estimation and channel coding are additionally taken into account.