摘要(英) |
In this paper, we propose an algorithm for spatial-temporal spectrum sensing in cognitive radio heterogeneous networks. In cognitive radio heterogeneous networks, cognitive radio users, also called secondary users, communicate with neighbors to share their information. In order to identify cooperative neighbors, each secondary user locates the position of the primary user. The weighted interpolation (WIP) algorithm is used to obtain the primary user’s position and then the secondary user know whether it is in the cell coverage or not. The distributed consensus algorithm is then used to combine the energy information gathered in each secondary user. With positioning and consensus combining algorithm, the proposed algorithm outperforms the conventional algorithm for spatial-temporal spectrum sensing in cognitive radio heterogeneous networks. When the network spatial-temporal false alarm probability, P_(f,net), is 0.1, the network spatial-temporal detection probability, P_(d,net), can be greater than 0.97.
The hardware for each cognitive radio secondary user is also designed and implemented. It consists of location, energy combination, and decision blocks. Hardware sharing technique is used to be simplified. Finally, we verify the design by FPGA, Virtex6 XC6VLX550T. The operation frequency is 47.536MHz. And the arithmetic units are four multipliers, two CORDIC dividers, and a CORDIC absoluter. The hardware is a low complexity design.
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