Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications
Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Fundamentals of wireless communication
Fundamentals of wireless communication
Physical modeling of communication systems in information theory
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
Mutual coupling in MIMO wireless systems: a rigorous network theory analysis
IEEE Transactions on Wireless Communications
Duality, achievable rates, and sum-rate capacity of Gaussian MIMO broadcast channels
IEEE Transactions on Information Theory
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Electromagnetic field theory provides the physics of radio communications, while information theory approaches the problem from a purely mathematical point of view. While there is a law of conservation of energy in physics, there is no such law in information theory. Consequently, when, in information theory, reference is made (as it frequently is) to terms like energy, power, noise, or antennas, it is by no means guaranteed that their use is consistent with the physics of the communication system. Circuit theoretic multiport concepts can help in bridging the gap between the physics of electromagnetic fields and the mathematical world of information theory, so that important terms like energy or antenna are indeed used consistently through all layers of abstraction. In this paper, we develop circuit theoretic multiport models for radio communication systems. To demonstrate the utility of the circuit theoretic approach, an in-depth analysis is provided on the impact of impedance matching, antenna mutual coupling, and different sources of noise on the performance of the communication system. Interesting insights are developed about the role of impedance matching and the noise properties of the receive amplifiers, as well as the way array gain and channel capacity scale with the number of antennas in different circumstances. One particularly interesting result is that, with arrays of lossless antennas that receive isotropic background noise, efficient multistreaming can be achieved no matter how densely the antennas are packed.