Alina Badescu

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Multiuser detection technique implies joint demodulation of overlapping data streams of data sent by different users, improving their individual performances based on the knowledge of some key parameters of all users. Each user is identified by its own signature code, which should be, in the ideal case, orthogonal on all the others. Several multiuser(More)
This paper aims to illustrate the performances of different spreading sequences in mean-square-error linear multiuser systems. The analyzed spreading sequences are Walsh codes (length 8 and 32), PN (pseudo-random) sequences and Gold sequences. Influence of correlation between sequences will be studied and the results are shown as BER (Bit Error Rate)(More)
The area of underground radio technology represents a constant problem among radio communication systems. This paper aims to suggest a possible scenario for transmission/receiving of signals from a salt mine. It is assumed that the system used is a synchronous CDMA system and the users' signals have equal powers. In order for the performances to be improved(More)
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