Optimal Modulation for Cognitive Transmission over AWGN and Fading Channels
Paper in proceedings, 2011

This paper proposes a new modulation method for an uncoded cognitive transmission (secondary user transmission) in presence of a Primary User (PU) for AWGN and time-varying flat-fading channels. Interference symbol of the PU is assumed to be known at the transmitter of the Cognitive User (CU) beforehand. Based on this knowledge and using a symbol by symbol approach, we design a CU modulation which can fulfill the coexistence conditions of the CU and the PU. The proposed method is a low-complexity modulation approach in a single (complex-valued) dimension rather than a high dimensional coding scheme, but still it achieves good performance. The robustness of the method is also investigated in case of having an imperfect knowledge about the PU transmitted symbols. An implementation algorithm for our modulation method is presented and its performance is evaluated by experiments.

Interference Avoidance

Imperfect Side Information

Cognitive Radio

Modulation

Uncoded Communication

Fading Channel

Interference Channel

Author

M Reza Khanzadi

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

GigaHertz Centre

Kasra Haghighi

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Thomas Eriksson

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

17th European Wireless Conference 2011, EW 2011; Vienna; Austria; 27 April 2011 through 29 April 2011

575-580

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

ISBN

978-3-8007-3343-9

More information

Created

10/7/2017