Download Communications, Information and Network Security by Waslon Terllizzie A. Lopes (auth.), Vijay K. Bhargava, H. PDF

By Waslon Terllizzie A. Lopes (auth.), Vijay K. Bhargava, H. Vincent Poor, Vahid Tarokh, Seokho Yoon (eds.)

ISBN-10: 1441953183

ISBN-13: 9781441953186

Communications, details and community Security is a wonderful reference for either specialist and educational researchers within the box of conversation. these operating in space-time coding, multiuser detection, and instant networks will locate the publication to be of specific use. New and hugely unique effects by way of major specialists in communique, info concept, and information protection are provided.
Communications, details and community Security is a tribute to the wide and profound paintings of Ian Blake within the box of verbal exchange. all the members have separately and jointly committed their paintings to Professor Blake.

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Example text

9) The set of all error symbol patterns of any length may be expressed as FE* = (1 - Fc - Fe)-l. Notice that Ps(m, n) is equal to the probability that m error symbols from the set enumerated by Fe occur in a block of n consecutive error symbols. 10) n=Om=O where the commuting indeterminates sand z mark the number of error symbols from the set enumerated by Fe and the length of the error sequence, respectively. Our interest in this series relies on the fact that the coefficient of sm zn is the quantity of interest, that is, Ps (m, n) = [sm zn] Hp(s, z).

7. Bit error rate of the proposed system as function of the interleaving depth (k, expressed in symbol intervals) considering the QPSK constellation and fD = 100 Hz. This is an important result, since it establishes that a good performance could be obtained using an interleaving depth corresponding to a time interval with only 60% of channel correlation. It is important to mention that a larger interleaving depth causes a long processing delay and large memory requirements of the system. As mentioned before, for () = 0° the system performance does not depend on the interleaving depth because there is no redundancy between the quadrature and in-phase components of the transmitted symbols.

1 The Effect of Interleaving The objective of this section is to study the effect of symbol interleaving in a block coded system over general FSC models. Recall that the received sequence in the ith row of the deinterleaving is ri = (v~ + Ci, v~ + ci+ld' v~ + ci+ 2Id' ... , v~ + ci+(n-l)IJ. The error sequence produced by the interleaved channel with interleaving degree Id is defined as (ci ci+ld ci+2Id ... ci+(n-l)IJ. Notice that the Id - 1 symbols produced by the channel between two received symbols in a received word are irrelevant to the decision process.

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