Iterative primary systems detection and complexity reduction for spectrum sharing technique

This paper discusses the primary systems detection technique for the OFDM system to share the spectrum among several radio systems such as UWB and other narrow band systems. In the iterative detection scheme, the received signals are assumed to be sum of the sinusoidal signals, and the coefficients of the sinusoidal signal to be minimized the error function by using Newton method. The detected amplitude is compared with the threshold value to detect usage of the primary systems. And frequency band of the primary systems also can be detected. However the calculation amounts are increased since iterative procedures are utilized. In this paper, the number of iterations for Newton method and the sine signal detection is considered to reduce the calculation amounts. The error of the coefficients estimation, miss-Detection Error Rate (DER) and False Alarm Rate (FAR) are evaluated and the performances are compared with the conventional technique using FFT.