Please use this identifier to cite or link to this item: https://dspace.upt.ro/xmlui/handle/123456789/1435
Title: On the performance of sequences for uplink QS-CDMA system [articol]
Authors: Khan, Zaheer
Halunga, Simona
Subjects: Bit Error Rate (BER)
Interference Free Window (IFW)
Loosely Synchronized (LS)
Multiple Access Interference (MAI)
Signal-to-Noise Ratio (SNR)
Quasi-Synchronous CDMA (QS-CDMA)
Zero Correlation Zone (ZCZ)
Issue Date: 2008
Publisher: Timişoara:Editura Politehnica
Citation: Khan, Zaheer. On the performance of sequences for uplink QS-CDMA system. Timişoara: Editura Politehnica, 2008
Series/Report no.: Seria electronică şi telecomunicaţii;Tom 53(67), fasc. 2 (2008)
Abstract: Loosely Synchronized (LS) sequences having Interference Free Window (IFW) are considered to be good candidates for QS-CDMA systems. The recent LS sequence constructions have generated very small sets of sequences exhibiting IFW, thus making them suitable for lightly loaded QS-CDMA. In this paper, it is shown that under certain scenarios for generalized lightly loaded QS-CDMA, there exist traditional sequences, that give either comparable performance or outperform LS sequences, in terms of cross-correlation values. We have demonstrated our results, using short length sequences of length L=31, 32and 38. We have shown that for a QSCDMA system with 15 users, and with chip delays equal to IFW of LS sequences, subsets of WH and Oppermann sequences outperform family of LS sequences. Also, either they give comparable performance or outperform LS sequences, when compared for 8 user QS-CDMA system, with a single or two user delays, 1-3 chips outside the IFW of LS sequences. Moreover, to demonstrate our results we have compared BER of uplink QS-CDMA system in AWGN channel, using different sequence subsets and different scenarios.
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