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    • 5. 发明申请
    • 周波数誤差推定を行う受信機および周波数誤差の推定方法
    • 频率误差估计接收机和频率误差估计方法
    • WO2002082758A1
    • 2002-10-17
    • PCT/JP2002/002443
    • 2002-03-14
    • 三菱電機株式会社棚田 一夫久保 博嗣浦口 剛
    • 棚田 一夫久保 博嗣浦口 剛
    • H04L27/22
    • H04L7/042H04L27/0014H04L2027/0034H04L2027/0048H04L2027/0065H04L2027/0095
    • A frequency error estimating receiver comprising sampling means for sampling the received signal sequentially, a plurality of decoding means for which different frequency correction values are preset and which corrects the frequency of each sample of the received signal according to the frequency correction values, demodulates each sample after the frequency correction, outputs the judgment values of the received signal and reliability information, and thereby detects a known synchronous word inserted into the received signal from each of the judgment values, judgment value selecting means for selecting one final judgment value from the judgment values on the basis of the reliability information and the synchronous word detection result outputted from the decoding means, and frequency error detecting means for estimating the frequency error of the received signal on the basis of the frequency correction values of the decoding means, which correspond to the final judgment value.
    • 一种频率误差估计接收机,包括用于顺序对接收信号进行采样的采样装置,根据频率校正值对不同的频率校正值进行预设并且校正接收信号的每个样本的频率的多个解码装置, 在频率校正之后,输出接收信号和可靠性信息的判断值,从而从每个判断值检测插入到接收信号中的已知同步字,判断值选择装置,根据判断值选择一个最终判断值 基于从解码装置输出的可靠性信息和同步字检测结果,以及频率误差检测装置,用于根据解码装置的频率校正值来估计接收信号的频率误差, 最终判断价值。
    • 9. 发明申请
    • FREQUENCY OFFSET ESTIMATION IN A CDMA SYSTEM
    • CDMA系统中的频率偏移估计
    • WO2009059907A1
    • 2009-05-14
    • PCT/EP2008/064473
    • 2008-10-24
    • ICERA INCWALKER, NICHOLAS, Simon
    • WALKER, NICHOLAS, Simon
    • H04B1/707
    • H04B7/2125H04B1/709H04J3/0685H04L27/0014H04L2027/0028H04L2027/0048H04L2027/0065H04L2027/0087H04W56/00
    • The present invention provides a method of estimating a frequency offset. The method comprises receiving a wireless signal timed according to a first frequency; generating a local signal timed according to a second frequency; and performing a plurality of synchronisation searches, each search comprising obtaining a set of correlation results indicative of a correlation between the wireless signal and the local signal at different timing offsets of the wireless signal relative to the local signal. The method then comprises finding a series of results, with a result from each of a plurality of the synchronisation searches, for which the difference in timing offset between results from adjacent searches in the series is within a maximum specified value. A frequency offset between the first and second frequencies can be determined from the series.
    • 本发明提供一种估计频偏的方法。 该方法包括接收根据第一频率定时的无线信号; 产生根据第二频率定时的本地信号; 并且执行多个同步搜索,每个搜索包括获得一组指示无线信号与本地信号之间的相关性的相关结果的集合,该无线信号与本地信号相对于本地信号的不同定时偏移。 该方法然后包括从多个同步搜索中的每一个获得结果的一系列结果,对于该结果,来自该系列中的相邻搜索的结果之间的定时偏差的差异在最大规定值内。 可以从该系列中确定第一和第二频率之间的频率偏移。
    • 10. 发明申请
    • NARROW BAND RECEIVER
    • 窄带接收器
    • WO2008065419A1
    • 2008-06-05
    • PCT/GB2007/004602
    • 2007-11-30
    • PLEXTEK LIMITEDMASSAM, Peter, DavidBOWDEN, Philip, AlanHOWE, Timothy, DavidJACKSON, Timothy
    • MASSAM, Peter, DavidBOWDEN, Philip, AlanHOWE, Timothy, DavidJACKSON, Timothy
    • H04L7/04
    • H04L7/042H04L7/046H04L27/0014H04L27/16H04L27/2657H04L2027/0026H04L2027/0048H04L2027/0065H04L2027/0095
    • Embodiments of the invention relate to RF receiver technology and are particularly concerned with aspects of decoding data received at low data rates. In one arrangement, an RF receiver comprises a signal processor arranged to perform a method of decoding data contained within a signal that comprises a set of slots, at least one said slot comprising a preamble portion and a payload portion and being transmitted at a predetermined transmission frequency. The signal processor is arranged to perform a first process to derive timing data from the preamble portion and perform a second process to extract information from the payload portion, the second process being triggered from said timing data derived from the first process. The preamble portion comprises at least a first sequence of data and a second sequence of data, and the second sequence is the inverse of the first sequence. In preferred embodiments the first process comprises identifying a transition between said first and second sequences of data and deriving said timing data from the identified transition. The sequences of data can be embodied as a repeating pattern comprising at least two elements, e.g. first sequence can comprise 24 pairs of {1, 0} "dotting" and the second sequence can comprise 8 pairs of {0, 1} "anti- dotting". This transposition, or interface, between the first and second sequences is identified by components of the signal processor, and enables the receiver to identify bit timing associated with the preamble.
    • 本发明的实施例涉及RF接收机技术,并且特别涉及在低数据速率下解码数据的方面。 在一种布置中,RF接收机包括信号处理器,其被布置为执行解码包含在包括一组时隙的信号中的数据的方法,所述至少一个所述时隙包括前导码部分和有效载荷部分,并且以预定的传输 频率。 信号处理器被布置为执行第一处理以从前导码部分导出定时数据,并执行从有效载荷部分提取信息的第二处理,第二处理是从从第一处理导出的所述定时数据触发的。 前导部分包括至少第一数据序列和第二数据序列,第二序列是第一序列的倒数。 在优选实施例中,第一过程包括识别所述第一和第二数据序列之间的转换,并从所识别的转换中导出所述定时数据。 数据序列可以被实施为包括至少两个元素的重复图案,例如, 第一序列可以包括24对{1,0}“点”,第二序列可以包括8对{0,1}“反点”。 第一和第二序列之间的这种转置或接口由信号处理器的组件标识,并且使得接收机能够识别与前导码相关联的比特定时。