Abstract
We present a technique based on the frequency diversity inherent in direct sequence spread spectrum (DS-SS) signals that allows to extend the capacity of CDMA systems based on DS-SS. The proposal makes use of several sets of DS-SS signals modulated by carriers separated by a fraction of the chip rate, so that there is frequency overlap between adjacent sets. The frequency diversity of DS-SS signals allows the use of correlated frequency bands to cancel the inter-set interference. For the case of a frequency separation between the interfering and cancelling components equal to the chip rate, the process is code independent and can therefore be applied in the downlink. Numerical results show that non-negligible bandwidth savings can be achieved at the expense of a small noise penalty.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
S. Abeta, H. Atarashi and M. Sawaashi, “Forward link of coherent DS-CDMA and MC-CDMA Broadaband packet wireless in a multicell environment”, Proc. of VTC Fall, Sept. 2000, Boston.
L. B. Milstein, “Wideband Code Division Multiple access”, IEEE J on Selec. Areas on Commun., Aug. 2000, pp. 1344–1354
L. Gonçalves and A. Gameiro,“ Frequency Shift Based Multiple Access Interference Canceller for DS CDMA Signals”, to be presented at VTC 2001, Atlantic City,Oct. 2001.
A. Gameiro, “A cyclostationary approach to enhance the capacity of multipath synchronous CDMA channels ”, In preparation.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2002 Springer Science+Business Media New York
About this chapter
Cite this chapter
Gameiro, A. (2002). Capacity Enhancement of DS-CDMA Downlink through Multicarrier with Frequency Overlapping. In: Fazel, K., Kaiser, S. (eds) Multi-Carrier Spread-Spectrum & Related Topics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-3569-7_25
Download citation
DOI: https://doi.org/10.1007/978-1-4757-3569-7_25
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-4945-5
Online ISBN: 978-1-4757-3569-7
eBook Packages: Springer Book Archive