Performance of RS-Coded DS/CDMA Microcellular Systems with M-ary Orthogonal Signaling
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
Closed-loop architecture and protocols for rapid dynamic spreading gain adaptation in CDMA networks
IEEE/ACM Transactions on Networking (TON)
A New Construction of Signature Waveforms for Multi-rate Multi-cell QS-CDMA Systems
Wireless Personal Communications: An International Journal
Bit-Error Probability of Asynchronous Multicode DS-CDMA Systems in Rayleigh Fading
Wireless Personal Communications: An International Journal
Theoretical analysis of the orthogonality factor in WCDMA downlinks
IEEE Transactions on Wireless Communications
New Signature Waveforms for Multi-rate QS-CDMA System with QPSK Modulation
Wireless Personal Communications: An International Journal
DS-CDMA downlink systems with fading channel employing the generalized receiver
Digital Signal Processing
Wireless Personal Communications: An International Journal
A ZCZ-CDMA system with BFSK modulation
International Journal of Communication Systems
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In this paper, we investigate the application of the concatenated orthogonal/PN spreading scheme for a cellular direct sequence code-division multiple access (DS-CDMA) system with integrated traffic. The performance of the system is evaluated in terms of user capacity. In order to incorporate traffic with a wide range of source rates, line rates (adjusted data rates before spreading) have to be selected for transmission. For traffic with source rates higher than the line rate of concern, we propose the use of concatenated orthogonal/PN spreading sequences to subdivide a high rate stream into parallel line rate streams. Therefore, in this paper, we first analyze the properties of the concatenated orthogonal/PN spreading sequences. The results are used to evaluate their performance for homogenous voice traffic in various cellular mobile environments with multipath fading, lognormal shadowing, and path loss. Our results show that the proposed spreading scheme offers a significant improvement in the forward link capacity as compared to using the conventional nonconcatenated long PN sequence, especially if the multipath fading is Rician (e.g., microcellular and indoor picocellular systems). Incorporating the notion of line rate, we then evaluate the performance of a system with integrated voice and video traffic. Special emphasis is placed on the effect of line rate selection on the overall capacity which leads to the optimal selection of line rates