Abstract
5G network is a heterogeneous large-scale network. Cognitive Radio (CR) technology can be used to realize selection based on the communication time, communication resources, and communication requirement so as to improve the system performance of the whole communication system. Cognitive Radio (CR) system based on wavelet packet owns better flexibility and bandwidth efficiency. The optimal wavelet packet filter optimization algorithm is proposed in the paper for guaranteeing un-licensed user’s (un-LU) data transmission rate and optimizing the performance of system. The intelligent search algorithm is used to obtain the optimal wavelet filter. The simulation results show that the Intercarrier Interference (ICI) and bit error rate (BER) performance of the new optimal wavelet filter algorithm without sacrificing any un-LU’s subcarriers is better than other three masking subcarriers algorithms.
Highlights
The demand of various services on APP and network terminals is increasing with the continuous popularization of new network intelligent terminals
The paper is organized as follows: the system model is provided in Section 2; in Section 3, the system optimizing algorithm is proposed; the simulation results are described in Section 4; Section 5 concludes the paper
The algorithm initial values proposed in the paper are set as follows: Db(6) wavelet and QPSK are used to modulate signals
Summary
The demand of various services on APP and network terminals is increasing with the continuous popularization of new network intelligent terminals. Wavelet Packet Modulation (WPM) uses wavelet packet basis to modulate the signals It can improve the bandwidth utilization and reduce the sidelobe interference because it does not need the cyclic prefix and pilot. In order to ensure and improve the communication quality of LU, researching the optimizing algorithms of SP based on WPM to suppress interferences is very meaningful. For reducing wasting the transmission bandwidth of un-LU, the optimal deactivated subcarriers algorithm is proposed. In order to improve the spectrum utilization, a new SP system optimization algorithm based on optimal wavelet filter is proposed in the paper. It can suppress ICI and optimize performance of SP without wasting any bandwidth of un-LU. The paper is organized as follows: the system model is provided in Section 2; in Section 3, the system optimizing algorithm is proposed; the simulation results are described in Section 4; Section 5 concludes the paper
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