Title :
Asynchronous space-time cooperative communications in sensor and robotic networks
Author :
Ng, Fan ; Hwu, Juite ; Chen, Mo ; Li, Xiaohua
Author_Institution :
Dept. of Electr. & Comput. Eng., State Univ. of New York, Binghamton, NY, USA
Abstract :
For wireless sensor networks or robotic networks, cooperative communications encoded with space-time block code (STBC) are desirable to improve their energy efficiency and reliability. However, existing STBC-encoded cooperative communication schemes usually require perfect synchronization among the transmitting sensors or robots, which is difficult and even impossible to achieve in practice. In this paper, we address this problem by developing a new receiving scheme for Alamouti´s STBC cooperative transmission where two asynchronous transmitting sensors or robots are employed. The new scheme uses a linear-prediction-based channel equalization technique to mitigate the effect of asynchronism. The performance of the new scheme is analyzed and demonstrated by simulations.
Keywords :
linear predictive coding; robots; sensor fusion; space-time codes; wireless sensor networks; asynchronous space-time cooperative communications; asynchronous transmitting sensors; linear-prediction-based channel equalization technique; robotic networks; space-time block code; wireless sensor networks; Antenna arrays; Energy efficiency; Frequency synchronization; Intelligent networks; Orbital robotics; Robot sensing systems; Sensor arrays; Spread spectrum communication; Transmitters; Wireless sensor networks;
Conference_Titel :
Mechatronics and Automation, 2005 IEEE International Conference
Conference_Location :
Niagara Falls, Ont., Canada
Print_ISBN :
0-7803-9044-X
DOI :
10.1109/ICMA.2005.1626798