Integration of COFDM Systems with Multiple Antennas and Design of Adaptive Medium Access Protocols
Authors: Martini, D. and Wolz, Benedikt and Rembold, B. and Walke, Bernard
Chair of Communication Networks (ComNets), Faculty 6, RWTH Aachen University
: Zheng Xie
In OFDM -Concepts for Future Communication Systems, p. 4, Heidelberg, Germany ,Springer, 2010.
Publication Date: , 2010
On page(s):4
ISBN:
Abstract Besides medium access in time and frequency domain, the space and polarization domain can be exploited using multiple antenna (MIMO) systems for space division multiple access. SDMA combined with OFDM are the key technologies for future wireless and mobile communication systems as specified in standards such as IEEE 802.16d, IEEE 802.11n and 3GPP LTE. This work focuses on the development and prototype implementation of medium access control (MAC) protocols of a demonstration system that uses multiple antennas. The goal is to serve all user terminals (UT) best by taking their instantaneous channel condition into account. A number of candidate channel-adaptive MAC protocols were designed to be implemented in a stochastic event driven simulator based on the openWNS tool. The protocol stack under study operates in between a multi-media load generator and an interference engine that calculates the current SINR at the receiver dependent on the direction of arrival (DoA). The contribution of a IEEE 802.16 specific transceiver chain is fed-in from link-level simulation results providing DoA specific bit error characteristics. The openWNS tool is mainly employed to compare the performance of the MAC protocols, the usefulness of the interface between MAC and PHY and the constraints of an SDMA enabled scheduler. Besides simulation studies to understand the performance critical parameters, an analytical validation of the used simulator and a complexity analysis of a number of SDMA based service disciplines was performed. The demonstration system was completely implemented using a modular FPGA system and two high-performance power PCs that to perform MAC in real time. The contribution of MIMO technologies to improve the system capacity was evaluated by means of the SINR values that results from the studied antenna configurations. While the FPGA hardware was taken from a former project, the bidirectional transceiver chains including multiport antennas were new designed and implemented, resulting in a realtime 4x4 bidirectional MIMO test bed.
Author Keywords
Bibtex
@BOOK{Martini2010,
AUTHOR = {Martini, D. and Wolz, B. and Rembold, B. and Walke, B.},
TITLE = {Integration of COFDM Systems with Multiple Antennas and Design of
Adaptive Medium Access Protocols},
YEAR = {2010},
PAGES = {4},
PUBLISHER = {Springer},
ADDRESS = {Heidelberg, Germany },
BOOKTITLE = {OFDM -Concepts for Future Communication Systems},
SERIES = {Signals and Communication Technology},
EDITION = {Hermann Rohling},
AFFILIATION = {Chair of Communication Networks (ComNets), Faculty 6, RWTH Aachen University},
URL = {https://www.comnets.rwth-aachen.de}
}