Search

Spectrum sensing is an important issue of cognitive radio(CR), the complexity of which can be efficiently reduced by introducing spectrum pooling strategy. Because of the intrinsic sparsity of specrum pool the payoff of spectrum sensing can be increasingly decreased by employing compressed sensing technique. In this paper a wideband compressed spectrum sensing(CSS) method based on spectrum pooling edge detection is derived. The mathematic connection of the compressed sampling signal and the spectrum pooling edge was firstly analyzed, based on which the CSS model of wideband spectrum sensing was established in this paper. At last, analysis and simulation results show that this method achieves better detection performance and costs lower computing resource than edge detection based CS spectrum sensing method. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Considering a multiple-input-multiple-output(MIMO) cognitive radio(CR) system consisting of a primary transmitter-receiver pair, and a secondary base station-receiver pair, to improve the system capacity of the primary user(PU) and secondary user(SU), this paper proposed a cooperative spectrum sharing scheme based on linear precoding design, in which the PU leases half of its transmission slot to the SU in exchange for the SU cooperatively relaying the PU's data and the corresponding precoding matrices are jointly optimized. Simulation results show that compared to conventional opportunistic spectrum sharing scheme, it proposed the cooperative spectrum sharing scheme can effectively enhance the system performance of both PU and SU. [ABSTRACT FROM AUTHOR]

A mathematical model for computing the out-of-band (OOB) leakage radiation in NC- OFDM systems and the interference to the adjacent primary users (PUs) is presented in this paper. Based on this mathematical model, the optimal parameters could be obtained by solving the nonlinear programming (NLP) problem subject to secondary users (SUs)' spectrum overhead and PUs' occupancy rate r. The results showed the close relationship between the number of guard subcarriers and the parameters of input back off (IBO) as well as PU occupancy r and interference temperature tolerance. The simulation results have shown that, under the conditions of given PU occupancy r and PU interference temperature limit, the solution of proposed programming problem can be used to design the optimal system parameters for secondary users with the smallest number of guard subcarriers and the demand of system to the parameters of IBO. [ABSTRACT FROM AUTHOR]