Symbol-by-Symbol CDMA Spreading Gain Adaptation and Detection Using OVSF Sequences

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...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2009-09, Vol.8 (9), p.4529-4539
Main Authors: Lee, D., Lih-feng Tsaur, Naeem, M.
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Adaptation
Applied sciences
Code standards
Communication protocol
Downlink
Exact sciences and technology
Frames
Gain
Messages
Mobile communication
Multiaccess communication
OVSF code
Paper technology
Radiocommunications
Receivers
Resource management
Spread spectrum communication
Spreading
symbol-by-symbol adaptive transmission
Symbols
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Teletraffic
Throughput
Transmission and modulation (techniques and equipments)
Transmitters
Transmitters. Receivers
Wireless application protocol
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Summary: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.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2009.071353