TY - GEN
T1 - Space-time-frequency degrees of freedom
T2 - 2007 IEEE International Symposium on Information Theory, ISIT 2007
AU - Hanlen, Leif W.
AU - Abhayapala, Thushara D.
PY - 2007
Y1 - 2007
N2 - We bound the number of electromagnetic signals which may be observed over a frequency range [F - W, F + W] a time interval [0, T] within a sphere of radius R. We show that the such constrained signals may be represented by a series expansion whose terms are bounded exponentially to zero beyond a threshold. Our result implies there is a finite amount of information which may be extracted from a region of space via electromagnetic radiation.
AB - We bound the number of electromagnetic signals which may be observed over a frequency range [F - W, F + W] a time interval [0, T] within a sphere of radius R. We show that the such constrained signals may be represented by a series expansion whose terms are bounded exponentially to zero beyond a threshold. Our result implies there is a finite amount of information which may be extracted from a region of space via electromagnetic radiation.
UR - http://www.scopus.com/inward/record.url?scp=51649112181&partnerID=8YFLogxK
U2 - 10.1109/ISIT.2007.4557104
DO - 10.1109/ISIT.2007.4557104
M3 - Conference contribution
SN - 1424414296
SN - 9781424414291
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 701
EP - 705
BT - Proceedings - 2007 IEEE International Symposium on Information Theory, ISIT 2007
Y2 - 24 June 2007 through 29 June 2007
ER -