Title :
Optimal Non-Coherent M-ARY Energy Shift Keying for Cooperative Transmission in Sensor Networks
Author_Institution :
Institut fur Telematik, Karlsruhe Univ.
Abstract :
Cooperative transmission follows the idea to achieve better reception quality for wireless communication systems by exploiting spatial diversity. We discuss the case where a group of sensor nodes transmit cooperatively and simultaneously identical symbols to a far destination. Doing so, they achieve a higher total transmit power. This is useful to reach destinations when no intermediate relays are able to act as repeater. We discuss this situation under the constraints of low power and low cost hardware and derive an optimal symbol constellation for a M-ary modulation scheme to minimize the symbol error. For this, we assume neither phase nor carrier synchronization between cooperatively transmitting nodes or the receiver yielding an easy to implement system with very low requirements for the participating wireless sensor nodes. Transmitted signals superimpose non-coherently in the receiver which uses only the amplitude information to decode symbols acting as an energy detector. We therefore name this modulation energy shift keying (ESK)
Keywords :
diversity reception; modulation; wireless sensor networks; M-ary modulation scheme; cooperative transmission; optimal noncoherent M-ary energy shift keying; optimal symbol constellation; sensor networks; spatial diversity; wireless communication systems; Cost function; Frequency synchronization; Hardware; Intelligent networks; Power system relaying; Repeaters; Sensor systems; Transmitters; Wireless communication; Wireless sensor networks;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1661063