Spectrum Sensing for Efficient Sharing of LTE and DVB-T Systems
|Author(s)||Sara Sangtarash, Horace L. King|
|Issue Date||May, 2013|
|Publishing Date||May, 2013|
|Keywords||Cognitive Radio, White Space Devices, LTE, Secondary User|
This paper addresses a problem of spectrum sharing and coexistence between Long Term Evolution (LTE) systems and Digital Video Broadcasting-Terrestrial (DVB-T). Previous studies have shown that coexistence of LTE and DVB-T without protection guard may cause interference. However by applying Cognitive Radio (CR) access technique, the probability of interference will decrease and the available spectrum can be used more efficiently. The main objective in spectrum sensing in a given band is to optimize the performance of the LTE as secondary network. This performance can be tested using a statistical analysis tool incorporating Monte Carlo and Spectral Emission Mask (SEM) technique. In addition, the CR access technique is used to sense the spectrum over the primary usersí (Puís) band to detect the existence/absence of a Pu and use the free spectrum for LTE system as a secondary system. In this study coexistence of two different configurations was examined. The simulation results show that based on power level allocated to the secondary transmitter and in a given configuration, varying protection distances will be needed. Furthermore, tuning the transmission power levels and incorporating protection distances, can lead to more spectrum usage opportunities without harmful interference to the Pu (DVB-T receiver).