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    • 5. 发明授权
    • Preambles in OFDMA system
    • OFDMA系统中的前缀
    • US08340072B2
    • 2012-12-25
    • US13114579
    • 2011-05-24
    • Jianglei MaHang ZhangWen TongMing JiaPeiying ZhuMo-Han Fong
    • Jianglei MaHang ZhangWen TongMing JiaPeiying ZhuMo-Han Fong
    • H04W72/04
    • H04L27/2692H04B7/02H04B7/0452H04L5/0007H04L5/0023H04L5/0048H04L7/043H04L27/2613H04L27/265H04L27/2655H04L27/2686H04W24/02
    • The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of candidate base stations. The base station specific search is then performed in the vicinities of those peaks by using base station specific pseudo-noise sequences. With this two stage cell search, the searching window is drastically reduced. The preamble is matched to known values by a respective receiver to decode the signals and permit multiple signals to be transferred from the transmitter to the receiver. The preamble may comprise two parts, Preamble-I and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.
    • 本发明提供插入到OFDMA帧中并具有参与传输的所有基站的公共序列的前同步码。 用户站使用公共前导码上的公共序列执行精细同步,并且所得到的峰值将提供候选基站的位置。 然后通过使用基站专用伪噪声序列,在那些峰附近执行基站专用搜索。 通过这两个阶段的单元格搜索,搜索窗口大大减少。 前导码由相应的接收机与已知值匹配以对信号进行解码,并允许多个信号从发射机传送到接收机。 前导码可以包括两个部分,即前导码1和前导码2,其可以在不同的系统中使用,包括多输入多输入(MIMO)系统。