Coordinating transmit power and carrier phase for wireless networks with multi-packet reception capability
1 Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
2 Telecommunications Technology Association (TTA), Seongnam, Gyonggi-do 463-824, Republic of Korea
3 School of Information and Communication Engineering, Inha University, Incheon 402-751, Republic of Korea
4 Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
EURASIP Journal on Wireless Communications and Networking 2013, 2013:1 doi:10.1186/1687-1499-2013-1Published: 2 January 2013
Driven by advances in signal processing and multiuser detection (MUD) technologies, it has become possible for a wireless node to simultaneously receive multiple signals from other transmitters. In order to take full advantage of MUD in multi-packet reception (MPR) capable wireless networks, it is highly desirable to make the compound signals from multiple transmitters more separable on its constellation at the receiver by coordinating both the transmit power level and carrier phase offsets of the transmitters. In this article, we propose a feedback-based transmit power and carrier phase adjustment scheme that estimates the symbol energy and the carrier phase offset for each transmitter’s received signal, computes the optimal received power level and carrier phase shift to maximize the minimum Euclidean distance between the constellation points, and finally feeds the optimal transmit power level and phase shift information back to the transmitters. We then evaluate the performance of the proposed transmit power and carrier phase adjustment scheme and subsequently show that the proposed scheme significantly reduces the error probability in a multiuser communication system having MPR capability.