This paper proposes a new index modulation (IM) scheme for a multi-carrier system, in which spreading codes are selected by index bits. In the proposed scheme OFDM transmission is carried out without spreading codes on some of the subcarriers. At the same time, IM with spreading codes is applied. One of the spreading codes corresponding to index bits is selected in each subcarrier, and the selected code is modulated with assigned coding bits. By increasing the number of coding bits transmitted at a time, the coding rate of the system is reduced, and the overall performance is improved. The OFDM signal and the spreading signal by IM co-exists and interfere with each other. At a receiver, soft replica symbols are generated from the soft output of a demodulator or a decoder and subtracted from the received signal to cancel the interference. Numerical results obtained through computer simulation results show the performance improvement of about 3.0 dB at a bit error rate of 10−4 compared with the conventional multicarrier transmission and 6-path Rayleigh fading channels.
Index Modulation Scheme Using Sparse Perfect Gaussian Integer Sequences on Multicarrier System
2023-10-10
1459246 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
MULTICARRIER PASSIVE INTER-MODULATION PREDICTION FROM 2-CARRIER MEASUREMENTS
British Library Conference Proceedings | 2013
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