Won Sub Kim , Jin Soo Park

The KIPS Transactions:PartC, Vol. 11, No. 6, pp. 835-842, Dec. 2004
10.3745/KIPSTC.2004.11.6.835,   PDF Download:

Abstract

In this paper, we have analyzed the MC-DS/CDMA system with input signal synchronized completely through adjustment of the gain in the PLL loop, by using the hybrid SC/MRC-(2/3) technique, which is said to one of the optimal diversity techniques under the multi-path fading environment, assuming that phase error is defined to the phase difference between the received signal from the multi-path and the reference signal in the PLL of the receiver. Also, assuming that the regarded radio channel model for the mobile communication is subject to the Nakagami-m fading channel, we have developd the expressions and performed the simulation under the consideration of various factor, in the MC/DS-CDMA system with the hybrid SC/MRC-(2/3) diversity method, such as the Nakagami fading index(m), the number of paths(Lp), the number of hybrid SC.MRC-(2/3) diversity branches(L, Lo), the number of users (K), the number of subcarriers (U), and the gain in the PLL loop. As a result of the simulation, it has been confirmed that the performance improvement of the system can be achieved by adjusting properly the PLL loop in order for the MC/DS-CDMA system with the hybrid SC/MRC-(2/3) diversity method to receive a fully synchronized signal. And the value of the gain in the PLL loop should exceed 7dB in order for the system to receive the signal with prefect synchronization, even though there might be a slight difference according to the values of the fading index and the spread processing gain of the subcarrier.

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