Title :
On the energy detection of unknown signals over fading channels
Author :
Digham, Fadel F. ; Alouini, Mohamed-Slim ; Simon, Marvin K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Minnesota Univ., USA
Abstract :
This paper presents another look at the problem of energy detection of unknown signals over different fading channels. We start with the no diversity case and present some alternative closed-form expressions for the probability of detection (Pd) to those recently reported in [V.I. Kostylev, May 2002]. We then investigate the system performance when different diversity schemes are employed. It is shown that there is not much improvement in the probability of detection when either the probability of false alarm (Pf) exceeds 0/1 or the average signal-to-noise ratio (SNR) exceeds 20 dB. In addition, receiver operating characteristic (ROC) curves comparing the performance of equal-gain combining (EGC), selection combining (SC), and switch and stay combining (SSC) are presented. As an example, EGC introduces a gain of two orders of magnitude from the probability of miss perspective compared to the no diversity case while both SC and SSC introduce a gain of about one order of magnitude.
Keywords :
AWGN channels; diversity reception; fading channels; probability; signal detection; closed-form expressions; detection probability; diversity schemes; energy detection; equal-gain combining; fading channels; false alarm probability; receiver operating characteristic; selection combining; signal-to-noise ratio; switch and stay combining; Additive white noise; Closed-form solution; Detectors; Diversity reception; Fading; Gaussian noise; Probability; Signal detection; Signal to noise ratio; Switches;
Conference_Titel :
Communications, 2003. ICC '03. IEEE International Conference on
Print_ISBN :
0-7803-7802-4
DOI :
10.1109/ICC.2003.1204119