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We consider a spectrum sharing based cognitive radio network where a secondary mulitple-input multiple-output (MIMO) communication link coexists with a primary user by opportunistically utilizing the transmit spectrum originally allocated to the primary user. The secondary link employs orthogonal space-time block coding (OSTBC) at the transmitter and maximum likelihood (ML) decoding at the receiver...
In this paper we propose the novel concept of embedding extra symbol to the CCSK modulation based TDCS signal. The embedded symbol is derived from the PSK mapping. The results show that as the constellation size of the PSK mapping increases, the CCSK BER performance improves tremendously. The embedded symbol improves the TDCS symbol SNR and consequently enhances the cross-correlation property of the...
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