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A new problem formulation is presented for the Gaussian interference channels with two pairs of users, which are distinguished as primary users and secondary users, respectively. The primary users employ a pair of encoder and decoder that were originally designed to satisfy a given error performance requirement under the assumption that no interference exists from other users. In the scenario when...
There is a simple distributed optical fiber sensing system which is used to monitor vibration signal, having an additional sub-loop coupled with main ring by a 3dB coupler. This paper compares three outputting interfered beams, each of them traveling in the sub-ring 0, 1, 2 times separately. Using the simultaneous equations produced by those three outputs, it finds the relation between the interference...
Although the maximum transmission speed in IEEE 802.11a WLAN is 54 Mbps, the real throughput is actually limited to 20~30 Mbps. Except for the main effect from multi-path, we should also consider some non-ideal effects from imperfect hardware design, such as the IQ imbalance from direct conversion in RF front-end. IQ imbalance is not apparent in lower-order QAM modulation. However, in higher-order...
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