
In this chapter, we introduce a novel code-based index modulation technique for orthogonal frequency division multiplexing (OFDM), named index modulated OFDM spread spectrum (IM-OFDM-SS), which utilizes the indices of spreading codes to convey information in addition to conventional constellation symbols. We first present the system model of IM-OFDM-SS, including the transmitter and receiver structures. Then, the bit error rate (BER) performance in the presence of channel estimation errors is analyzed. Finally, we extend the idea to multi-code and multi-user scenarios.
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