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We analyze the multihop delay of ad hoc cognitive radio networks, where the transmission delay of each hop consists of the propagation delay and the waiting time for the availability of the communication channel (i.e., the occurrence of a spectrum opportunity at that hop). Using theories and techniques from continuum percolation and ergodicity, we establish the scaling law of the minimum multihop...
We address the multicast problem in cognitive radio networks, where secondary users exploit channels temporarily unused by primary users (i.e., spectrum opportunities). The existence of a communication link between two secondary users depends not only on the transmission power of the secondary transmitter and the distance between these two users, but also on the occurrence of spectrum opportunities...
We demonstrate an equalization technique to compensate for impairments induced by dispersion as well as I/Q imbalance and bias deviation in the MZM. The proposed scheme has a 2 dB improvement in back to back and a 4 dB gain after 800 km SSMF transmission with I/Q imbalance.
We experimentally demonstrate a generalized VSSB-OFDM format that judiciously determines the frequency gap between an inserted RF tone and the signal. The proposed scheme for 10 Gbps exhibits ~3 dB penalty after 1600 km SSMF transmission, and has an 8 dB improvement over the regular VSSB-OFDM.
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