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Hoga Saragih Fendy Santoso 《International Journal of Wireless Information Networks》2011,18(3):186-192
This research aims to investigate the throughputs of DS-CDMA with S-ALOHA systems over Nakagami/Nakagami dual-path gain fading
models with capture effects. The effects of fading on bit error rates (BERs) have been analysed by taking path gains into
consideration. Due to the discrepancy between path gain for the desired signals and path gain for interferences, the BERs
employed in our computations are the BERs of two different path gain models. Research indicates that the throughputs of DS-CDMA
with S-ALOHA steadily increase as the parameters of fading signals m and the length of code N progressively enhance. Likewise, the throughputs of DS-CDMA with S-ALOHA gradually step-up as the value of capture ratio
Q and the number of users K progressively step-down. 相似文献
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Hoga Saragih Fendy Santoso 《International Journal of Wireless Information Networks》2009,16(4):217-224
This paper aims to investigate the performance of adaptive slotted-ALOHA direct sequence code division multiple access (DS-CDMA)
over a multipath fading channel with capture effects. The transmission rate control algorithm has been proposed in response
to current traffic conditions. Furthermore, since the performance of S-ALOHA DS CDMA shall decrease in the presence of fading
channel environments the capture effect technique has been subsequently proposed. Accordingly, the effectiveness of the throughputs
relies on the value of capture probability and the probability of packets being successfully sent. Research indicates that
the throughputs of S-ALOHA DS-CDMA (using the following transmission rates: v b/s, 2v b/s, 4v b/s) with capture effects and adaptive S-ALOHA DS-CDMA with capture effects shall increase inverse proportionally to the
length of bits (B), the value of different number of paths L
p, as well as capture ratios Q. 相似文献
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