The using of mlseeq function

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Saed el 31 de En. de 2012
Hi all,
I am transmitting a sequence of N=1000 bits over an ISI channel of length 4, and then I am trying to use maximum likelihood sequence estimator (mlseeq) to estimate the transmitted sequence. I am using BPSK as the modulation scheme. Based on the MATLAB help, I wrote the mlseeq function as:
where y is the received sequence, h is the channel coefficients, [-1;1] is the vector of the ideal constellation points.
However, the BER curve I got is not smooth and fluctuating up and down (i.e.: not decaying in general). Is there any thing wrong in the above use of mlseeq?
Thanks in advance

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