Review of various code allocation schemes in the forward link of WCDMA network.
首发时间:2008-08-19
Abstract:In CDMA systems all users transmit their signals using a single carrier frequency. In order to decode signals from different UE two coding schemes are used Channelization and Scrambling. Channelization in the forward link apart from spreading the user data rate also maintains orthogonality between different channels to reduce interference between them. WCDMA uses orthogonal codes under the control of the base station to allocate appropriate codes to each channel. Since the code tree from which the orthogonal codes are derived is limited and has its inherent draw backs, many proposals are made to obtain most efficient and effective code assignment or allocation schemes that will result in allowing as much user as possible to access the network. In this paper we will try to summarize to the best of our ability such works and to try to compare the different results obtained from these works.
keywords: WCDMA, Code Blocking, Spreading and Fragmentation
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Review of various code allocation schemes in the forward link of WCDMA network.
摘要:In CDMA systems all users transmit their signals using a single carrier frequency. In order to decode signals from different UE two coding schemes are used Channelization and Scrambling. Channelization in the forward link apart from spreading the user data rate also maintains orthogonality between different channels to reduce interference between them. WCDMA uses orthogonal codes under the control of the base station to allocate appropriate codes to each channel. Since the code tree from which the orthogonal codes are derived is limited and has its inherent draw backs, many proposals are made to obtain most efficient and effective code assignment or allocation schemes that will result in allowing as much user as possible to access the network. In this paper we will try to summarize to the best of our ability such works and to try to compare the different results obtained from these works.
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Review of various code allocation schemes in the forward link of WCDMA network.
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