A Static Spectrum Aggregation Algorithm in Cognitive Radio System

Cong Yin¹, Xue-Zhi Tan^1,2,Lin Ma^1,2, Xiu-Hua Li¹ª¤

(1. Communication Research Center, Harbin Institute of Technology, Harbin 150001, China;ª¤2. Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory, Shijiazhuang, China)ª¤ª¤ª¤



Abstract:

Cognitive radio (CR) is known as an intelligent technology allowing a secondary user (SU) to occupy a primary user¡¯s (PU¡¯s) band when it is idle. Appearance of the idle band may be contiguous or non-contiguous. In other words, the PU¡¯s band and the idle band are distributed alternately over the spectrum. Apparently the non-contiguous idle band cannot be fully utilized in this context. This paper proposes an algorithm to solve the problem of low utilization of the non-contiguous idle band and to increase the number of the SU who needs access to the spectrum by a static spectrum aggregation (SSA) method combined with non-contiguous orthogonal frequency division multiplexing (NC-OFDM). The simulation results show that the SSA algorithm realizes at least 70£¥ utilization of the idle band which provides access to the spectrum for as many as 30 SUs as expected.ª¤

Key words:  cognitive radio  static spectrum aggregation  non-contiguous OFDMª¤

DOI£º10.11916/j.issn.1005-9113.2013.02.008

Clc Number:TN91

Fund: