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An Elementary Condition for Non-Norm Elements

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2 Author(s)
Guo, X. ; Dept. of Electr. & Comput. Eng., Univ. of Delaware, Newark, DE ; Xia, Xiang-Gen

Cyclic division algebra (CDA) has recently become a major technique to construct space-time block codes with nonvanishing determinant (NVD). One of the key steps in this technique is the determination of non-norm elements and a sufficient condition for the determination has been given by Kiran and Rajan lately based on algebraic number theory. In this paper, based on Kiran and Rajan's condition, we present a more elementary condition for non-norm elements when signals are QAM or HEX, which is easier to check. With this elementary condition, non-norm elements with smaller absolute values than the existing ones can be found.

Published in:

Information Theory, IEEE Transactions on  (Volume:55 ,  Issue: 3 )

Date of Publication:

March 2009

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