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We consider a multiuser scenario with a center node for data fusion, where simultaneously transmitting is required in real time and with low probability of interception. We established a novel multiple access scheme, named matrix division multiple access (MDMA), based on OFDM technology. Precoded with different matrices, the signal from different end nodes can be distinguished due to the signal space...
Bit error rate (BER) performance of the OFDM system has been widely studied on multi-path fading channel with the channel gain being modeled as various distributions. But the statistical distribution of the OFDM signal on the receiver side has neither been well studied, nor given the close-formed expression. In order to design the optimum detection criteria, especially for the hypothesis test of the...
OFDM-based cognitive radio (CR) can use a set of channels in the spectrum pool and catch the appeared spectrum opportunity on each channel. Not only the performance of the spectrum sensing algorithm, but also the length of the sensing period can affect how much the spectrum opportunity can be utilized by the CR. In order to achieve the maximum efficiency of spectrum opportunity utilization, a nonlinear...
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