Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Radio resource allocation in third generation mobile communication systems
IEEE Communications Magazine
SSDT-site selection diversity transmission power control for CDMA forward link
IEEE Journal on Selected Areas in Communications
Large-system-based performance analysis and design of multiuser cooperative networks
IEEE Transactions on Signal Processing
Improving the capacity of WCDMA system using ad hoc relaying
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Relaying power allocation with user-cooperation for OFDM-based MISO broadcast channels
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Downlink capacity of hybrid cellular ad hoc networks
IEEE/ACM Transactions on Networking (TON)
Downlink power distribution in a wireless CDMA network with cooperative relaying
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Recovering cooperative multiplexing gain in wireless relay networks
IEEE Transactions on Communications
Resource Allocation Schemes for the Heterogeneous OFDMA System with Multiple Ad Hoc Relays
Wireless Personal Communications: An International Journal
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In this paper, we consider the capacity of cellular code division multiple access (CDMA) when there is out-of-band ad hoc traffic relaying. The mobile stations (MSs) are dual-mode, having both ad hoc and cellular CDMA radios. An active MS is free to choose any available relay station (RS) within its ad hoc radio coverage area for dual-hop communication with the CDMA base station (BS). Communications between the RSs and the MSs use bandwidth which is available to the ad hoc radio and does not consume the CDMA capacity. Using this mechanism, CDMA interference can be reduced by dynamically selecting RSs which have more favorable CDMA link characteristics. Several relay station selection criteria are considered, namely, ad hoc relaying with low relative interference (ARRI), with best link gain (ARLG), and with shortest distance (ARSD). The relay station selection protocols are compatible with existing wireless local area network (WLAN) standards such as IEEE 802.11. An analytic model is used to compute the effects on uplink and downlink CDMA capacities when out-of-band relaying is added. The results show that very significant capacity improvements are possible by using these criteria compared with conventional CDMA with hard or soft handoff. Ad hoc relaying which dynamically tracks CDMA link quality can achieve greater capacity improvements than that using a distance-based relay station selection. Relaying, which considers both signal and interference conditions, achieves better capacity than that based on signal link quality alone.