Wcdma for Umts
Wireless Personal Communications: An International Journal
Fundamentals of wireless communication
Fundamentals of wireless communication
Closed-loop architecture and protocols for rapid dynamic spreading gain adaptation in CDMA networks
IEEE/ACM Transactions on Networking (TON)
Principles of Spread-Spectrum Communication Systems
Principles of Spread-Spectrum Communication Systems
Capacity of fading channels with channel side information
IEEE Transactions on Information Theory
Parallel structures for joint channel estimation and data detection over fading channels
IEEE Journal on Selected Areas in Communications
DS-CDMA system with joint channel estimation and MAP detection in time-selective fading channels
IEEE Journal on Selected Areas in Communications
Supporting rate guarantee and fair access for bursty data traffic in W-CDMA
IEEE Journal on Selected Areas in Communications
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We present a spreading gain adaptation protocol between a transmitter and a receiver communicating with each other through a Direct-Sequence Spread Spectrum system. This protocol does not require the transfer of an explicit control message indicating the change of spreading gain from the transmitter to the receiver. Also, according to this protocol, the transmitter can change the spreading gain "symbol by symbol" (SBS) as opposed to "frame by frame" (FBF); this enables extremely fast adaptation to the time-varying wireless channel and/or to the rate variation of the traffic. The proposed scheme uses the orthogonal variable spreading factor (OVSF) codes to enable the receiver to detect the spreading gain used by the transmitter. Our analysis indicates that fast adaptation can significantly improve the average throughput over a slow or no adaptation.