Abstract
This paper presents a novel diversity technique for single-antenna systems in frequency-selective channels. Assuming that the channel band is divided into multiple subchannels, symbols are transmitted on two frequency hopped subchannels simultaneously. To keep the total transmission power constant, the signal power in each of the two subchannels is reduced to half of what would be in single channel transmission. At the receiver selection diversity is collected by decoding the subchannel with a large gain. Furthermore, channel diversity can be obtained by combining complex-field coding (CFC) with the dual carrier selection design. We show that the effect of our design is similar to that of orthogonal frequency division multiplexing (OFDM), but ours achieves higher data transmission rate and collects selection diversity at the expense of increased implementation complexity. Numerical simulations are provided to validate the theoretical analysis.