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Code Assignment Algorithm for 2-Dimensional Block Spread CDMA Downlink

Author: YiXiangYu
Tutor: ZhaoHongLin
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Two-dimensional block spread spectrum CDMA OVSF code Code allocation algorithm Call outage probability
CLC: TN929.533
Type: Master's thesis
Year: 2010
Downloads: 16
Quote: 0
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Abstract


Broadband wireless mobile communication system , how to solve the multiple access interference f : Multiple- accessInterference , MAlI problem has been studied in recent years , the focus and difficulty . As a CDMA system , each user arrive at the base station via different fading channel , formed by the multiple access interference will seriously affect the performance of the receiver , reducing system capacity . The Tohoku University Anda Laboratory proposed a two-dimensional spreading based on orthogonal variable spreading factor forthogonalViable of the Spreading Factr 0VsF code and the combination of the two-dimensional block of code interleaving technique spread spectrum technology , to effectively eliminate multi-user interference . Meanwhile, 0vsF codes as channelization code can be used to support multi-rate data transmission, i.e. corresponding 0vsF code assigned according to the rate of the call request . However, in the code assignment process in the CDMA system , the code blocking reduce the resource utilization of the code tree , resulting in the waste of system resources . With the increase in the types and quantities of multimedia services , cDMA system code blocking problem has been highlighted . In order to effectively utilize the resources of the code tree , the optimal code allocation dimensional block spread cDMA system , the article studies the allocation principle and algorithm 0vsF code to find the two-dimensional the block spreading cDMA technology code allocation method . This paper will first analyze the system model and signal expression of the two-dimensional block the spreading cDMA technology , as well as the principle of 0vsF code tree structure . Next , according to a variety of existing code allocation algorithm classification , from the angle of the two orthogonal spreading code , the four kinds of single- code assignment algorithm suitable for the two - dimensional block spreading CDMA technology , after further proposed the technology multi code allocation algorithm, and finally computer simulation , and compare various algorithms call outage probability , QoS , call rate changes , as well as the spreading factor algorithm performance . Compare the performance of a variety of indicators , through the discussion of the various algorithms for this paper, and verify the a single code suitable for the two-dimensional of blocks spreading cDMA technology and multi-code allocation algorithm , and prove that you can take full advantage of the limited code tree resources in solving multiple access access interference at the same time , be able to provide a reliable multi-rate data transmission and multimedia services .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication
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