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    • 8. 发明授权
    • Orthogonal frequency division multiplexing-code division multiple access system
    • 正交频分复用码分多址系统
    • US08705641B2
    • 2014-04-22
    • US12984101
    • 2011-01-04
    • Yingming TsaiGuodong ZhangJung-Lin Pan
    • Yingming TsaiGuodong ZhangJung-Lin Pan
    • H04L27/28H04B1/707
    • H04B1/711H04L5/026H04L2025/03414
    • An orthogonal frequency division multiplexing (OFDM)-code division multiple access (CDMA) system is disclosed. The system includes a transmitter and a receiver. At the transmitter, a spreading and subcarrier mapping unit spreads an input data symbol with a complex quadratic sequence code to generate a plurality of chips and maps each chip to one of a plurality of subcarriers. An inverse discrete Fourier transform is performed on the chips mapped to the subcarriers and a cyclic prefix (CP) is inserted to an OFDM frame. A parallel-to-serial converter converts the time-domain data into a serial data stream for transmission. At the receiver, a serial-to-parallel converter converts received data into multiple received data streams and the CP is removed from the received data. A discrete Fourier transform is performed on the received data streams and equalization is performed. A despreader despreads an output of the equalizer to recover the transmitted data.
    • 公开了一种正交频分复用(OFDM)码分多址(CDMA)系统。 该系统包括发射机和接收机。 在发射机处,扩展和副载波映射单元利用复数二次序列码扩展输入数据符号,以产生多个码片,并将每个码片映射到多个副载波中的一个。 对映射到子载波的芯片执行逆离散傅立叶变换,并且将循环前缀(CP)插入到OFDM帧中。 并行到串行转换器将时域数据转换为串行数据流以进行传输。 在接收机处,串并转换器将接收的数据转换成多个接收的数据流,并从接收的数据中移除CP。 对接收的数据流执行离散付里叶变换,并进行均衡。 去扩展器对均衡器的输出进行解扩以恢复发送的数据。