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    • 1. 发明申请
    • WIRELESS COMMUNICATIONS SYSTEM EMPLOYING OFDMA AND CDMA TECHNIQUES
    • 无线通信系统采用OFDMA和CDMA技术
    • WO2007084366A1
    • 2007-07-26
    • PCT/US2007/000828
    • 2007-01-12
    • LUCENT TECHNOLOGIES INC.MONOGIOUDIS, PantelisNAGARAJ, ShirishVISWANATHAN, Harish
    • MONOGIOUDIS, PantelisNAGARAJ, ShirishVISWANATHAN, Harish
    • H04B1/707H04L27/26
    • H04L27/2615H04L5/0007H04L5/0016H04L5/0048H04L27/2607
    • Disclosed is an Orthogonal Frequency Division Multiple Access (OFDMA) based wireless communications system operable to communicate OFDMA type signals over a set of dynamically assigned orthogonal sub-carriers and Code Division Multiple Access (CDMA) type signals over a set of pre-allocated orthogonal sub-carriers. The OFDMA system utilizes pre-allocated orthogonal sub-carriers for CDMA type signal transmission in order to reduce the number of dynamic assignments of orthogonal sub-carriers in a typical OFDMA system. The OFDMA type signals may be signals processed in accordance with well-known OFDMA techniques, whereas the CDMA type signals may be signals processed in accordance with well-known CDMA and OFDMA techniques. The CDMA type signals may also be processed using a pre- coder incorporating a Discrete Fourier Transformer (DFT) matrix or Identity matrix to reduce the Peak-to-Average Power Ratio across the OFDMA system.
    • 公开了一种基于正交频分多址接入(OFDMA)的无线通信系统,其可操作以通过一组预先分配的正交子信道在一组动态分配的正交子载波和码分多址(CDMA)类型信号上传送OFDMA类型信号 -carriers。 OFDMA系统利用用于CDMA类型信号传输的预分配的正交子载波,以便减少典型OFDMA系统中的正交子载波的动态分配的数量。 OFDMA型信号可以是根据公知的OFDMA技术处理的信号,而CDMA型信号可以是根据公知的CDMA和OFDMA技术处理的信号。 也可以使用包含离散傅里叶变换器(DFT)矩阵或标识矩阵的预编码器来处理CDMA型信号,以减少OFDMA系统上的峰均功率比。