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Also, for the sake of simplicity, we now assume a maximum spreading length (in time domain, ).
Design A exhibited better current uniformity than B because of the symmetry in the current spreading length.
This condition establishes a tradeoff between code diversity (spreading length) and space diversity afforded by the proposed trilinear PARAFAC modeling.
For both 2 × 1 and 2 × 2 cases, the performance approaches the lower bound when the spreading length increases.
For a maximum spreading length, that is,, based on [11, Equation (18)], the interference term when transmitting real data can be expressed as (26).
Note that F=64 is a fixed parameter, while K is a transmission design parameter (now representing the frequency spreading length) that will be varied in our simulations.
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Figure 8 shows the numerical results of MIMO-SESS with the iterative detection for different spreading lengths.
The Renyi, Shannon and Fisher spreading lengths of the classical or hypergeometric orthogonal polynomials, which are quantifiers of their distribution all over the orthogonality interval, are defined and investigated.
Indeed these polynomials allow us to design an error-free computing approach for the entropic moments (weighted Lq-norms) of Hermite polynomials and subsequently for the Renyi and Tsallis entropies, as well as for the Renyi spreading lengths.
By approximating the probability density function (pdf) associated with the time-diversity detector by a Dirac delta function, we obtained a lower-bound expression for the BER of the iterative detector and verified with simulations that the bound is tight even for relatively small spreading lengths.
The filter blocks were designed for a channel delay spread length of 64 time domain samples and a SNR of 15 dB.
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