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In this paper, we propose a generalized code index modulation (CIM) technique for direct-sequence spread spectrum (DSSS) communication. In particular, at the transmitter, the bit stream is divided into blocks in which each block is divided into two subblocks: mapped and modulated subblocks. Thereafter, the bits within the mapped subblock are used to select one of the predefined spreading codes, which...
In this paper, we propose a cooperative retransmission scheme in a high dense network. The propose scheme applies a close-loop MIMO scheme for the retransmission. And, we consider the property of which the interference node is similar between the initial transmission and the retransmission. Then the transmitted node can retransmit the precoded signal considering interference for multiple pair nodes...
In this work, we study the problem of linear index coding from graph homomorphism point of view. We show that the decision version of linear (scalar or vector) index coding problem is equivalent to certain graph homomorphism problem. Using this equivalence expression, we conclude the following results. First we introduce new lower bounds on linear index of graphs. Next, we show that if the linear...
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