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    Channel estimation based on long training symbol with doubled cyclic prefix
    1.
    发明授权
    Channel estimation based on long training symbol with doubled cyclic prefix 有权
    基于具有加倍循环前缀的长训练符号的信道估计

    公开(公告)号：US08767848B2

    公开(公告)日：2014-07-01

    申请号：US13335705

    申请日：2011-12-22

    申请人： Taejoon Kim ,  Timothy M. Schmidl

    发明人： Taejoon Kim ,  Timothy M. Schmidl

    IPC分类号： H04L27/28 ,  H04L25/02 ,  H04J11/00 ,  H04L27/26 ,  H04L5/00

    CPC分类号： H04J11/0079 ,  H04L5/0044 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/262 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695

    摘要： In at least some embodiments, a receiver includes channel estimation logic configured to a process a long training field symbol having a doubled cyclic prefix. The channel estimation logic is configured to vary an amount of the doubled cyclic prefix used for channel estimation. Further, in some embodiments, a wireless communication device includes logic to enable communications based on at least two long training field symbols having a doubled cyclic prefix as part of a synchronization header. Further, in some embodiments, a method includes receiving a long training field symbol having a synchronization header with a doubled cyclic prefix and varying an amount of the doubled cyclic prefix used for channel estimation.

    摘要翻译： 在至少一些实施例中，接收机包括被配置成具有双重循环前缀的长训练场符号的处理的信道估计逻辑。 信道估计逻辑被配置为改变用于信道估计的双倍循环前缀的量。 此外，在一些实施例中，无线通信设备包括基于具有双重循环前缀的至少两个长训练场符号进行通信的逻辑，作为同步头部的一部分。 此外，在一些实施例中，一种方法包括接收具有双重循环前缀的同步头部并改变用于信道估计的双倍循环前缀的量的长训练场符号。

    Short and long training fields
    2.
    发明授权
    Short and long training fields 有权
    短期和长期的培训领域

    公开(公告)号：US08553730B2

    公开(公告)日：2013-10-08

    申请号：US12868397

    申请日：2010-08-25

    申请人： Timothy M. Schmidl ,  Anuj Batra ,  Srinath Hosur

    发明人： Timothy M. Schmidl ,  Anuj Batra ,  Srinath Hosur

    IPC分类号： H04J3/06

    CPC分类号： H04W56/001 ,  H04L27/2613 ,  H04L27/2634 ,  H04W4/80

    摘要： A method includes receiving a first plurality of symbols comprising complex portions. The method further includes applying conjugate symmetry to the first plurality of symbols, producing a second plurality of symbols comprising no complex portions. The method further includes transforming the second plurality of symbols using an inverse fast Fourier transform, producing a third plurality of symbols. The method further includes interpolating the third plurality of symbols, generating a short training field comprising at least one real portion of the third plurality of symbols, generating a long training field comprising at least one real portion of the third plurality of symbols, and transmitting the short training field and long training field in a WPAN.

    摘要翻译： 一种方法包括接收包括复数部分的第一多个符号。 该方法还包括将共轭对称性应用于第一多个符号，产生不包含复杂部分的第二多个符号。 该方法还包括使用快速傅里叶反变换来变换第二多个符号，产生第三个多个符号。 该方法还包括内插第三多个符号，产生包括第三多个符号的至少一个实部的短训练场，产生包括第三多个符号的至少一个实部的长训练场，并发送 短期培训领域和长期培训领域的WPAN。

    Reverse Viterbi and forward serial list Viterbi decoding for FER
    3.
    发明授权
    Reverse Viterbi and forward serial list Viterbi decoding for FER 有权
    反向维特比和正向串行列表维特比解码为FER

    公开(公告)号：US08483327B2

    公开(公告)日：2013-07-09

    申请号：US12383154

    申请日：2009-03-20

    申请人： Timothy M. Schmidl ,  Ariel Zaltsman ,  Anand G. Dabak

    发明人： Timothy M. Schmidl ,  Ariel Zaltsman ,  Anand G. Dabak

    IPC分类号： H04L27/06

    CPC分类号： H03M13/4115 ,  H03M13/09 ,  H03M13/356 ,  H03M13/4169

    摘要： A convolutionally encoded frame to be decoded includes a first portion of bits having additional error protection and another portion without additional error protection. The decoding of the frame involves reverse Viterbi decoding or Viterbi decoding on a reversed bit sequence followed by applying a serial list Viterbi algorithm to the first portion. The result is that the list of probable sequences have unique sets of bits in the first portion.

    摘要翻译： 要解码的卷积编码帧包括具有附加错误保护的第一部分位和不具有附加错误保护的另一部分。 该帧的解码涉及对反向比特序列的逆维特比解码或维特比解码，然后将序列表维特比算法应用于第一部分。 结果是可能序列的列表在第一部分中具有唯一的位集合。

    PHY layer PPDU construction for body area network (BAN) devices
    4.
    发明授权
    PHY layer PPDU construction for body area network (BAN) devices 有权
    物理层PPDU构建体区域网（BAN）设备

    公开(公告)号：US08391228B2

    公开(公告)日：2013-03-05

    申请号：US12760513

    申请日：2010-04-14

    申请人： Anuj Batra ,  Timothy M. Schmidl ,  Srinath Hosur ,  June Chul Roh

    发明人： Anuj Batra ,  Timothy M. Schmidl ,  Srinath Hosur ,  June Chul Roh

    IPC分类号： H04W4/00 ,  H04W72/04

    CPC分类号： H04W4/80 ,  H04L27/18 ,  H04L27/20 ,  H04L27/2675 ,  H04L69/22 ,  H04W52/36 ,  H04W52/367 ,  H04W72/0453 ,  H04W74/0816

    摘要： In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to construct a physical-layer service data unit (PSDU) based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper.

    摘要翻译： 在至少一些实施例中，通信设备包括具有物理（PHY）层的收发器。 基于用于BAN分组传输的恒定符号速率并且基于M-ary PSK，差分M-ary PSK或旋转差分M-ary PSK调制，PHY层被配置用于在有限多径环境中的体区域网络（BAN）操作。 PHY层被配置为基于级联块，插入缩短的比特块，Bose，Ray-Chaudhuri，Hocquenghem（BCH）编码器，移除缩短的比特块，加法来构造物理层服务数据单元（PSDU） 填充比特块，扩展器，比特交织器，加扰器和符号映射器。

    FINE SYMBOL TIMING ESTIMATION
    5.
    发明申请
    FINE SYMBOL TIMING ESTIMATION 有权
    精细符号时序估计

    公开(公告)号：US20120140858A1

    公开(公告)日：2012-06-07

    申请号：US12961271

    申请日：2010-12-06

    申请人： June Chul ROH ,  Srinath HOSUR ,  Timothy M. SCHMIDL

    发明人： June Chul ROH ,  Srinath HOSUR ,  Timothy M. SCHMIDL

    IPC分类号： H04L27/06

    CPC分类号： H04L27/205 ,  H04L27/2335

    摘要： Systems and methods for fine symbol timing estimation are disclosed herein. In one embodiment, a wireless receiver includes a differential detector, a correlator, a coarse symbol timing estimator, and a fine symbol timing estimator. The differential detector is configured to detect phase differences in a received preamble signal modulated using differential phase shift keying. The correlator is configured to correlate symbol values output by the differential detector against a reference sequence. The coarse symbol timing estimator is configured to generate a coarse symbol timing estimate, and to generate a coarse timing sample symbol index value corresponding to the coarse symbol timing estimate. The fine symbol timing estimator is configured to generate a fine symbol timing estimate that is more accurate than the coarse symbol timing estimate based on the coarse timing sample symbol index value and correlation samples at index values preceding and succeeding the coarse timing sample index value.

    摘要翻译： 本文公开了用于精细符号定时估计的系统和方法。 在一个实施例中，无线接收机包括差分检测器，相关器，粗略符号定时估计器和精细符号定时估计器。 差分检测器被配置为检测使用差分相移键控调制的接收前导信号中的相位差。 相关器被配置为将由差分检测器输出的符号值与参考序列相关联。 粗略符号定时估计器被配置为产生粗略符号定时估计，并且生成与粗略符号定时估计对应的粗定时采样符号索引值。 精细符号定时估计器被配置为基于粗略定时样本符号索引值和在粗略定时样本索引值之前和之后的索引值处的相关样本，生成比粗略符号定时估计更精确的精细符号定时估计。

    Method for transmission of unicast control in broadcast/multicast transmission time intervals
    6.
    发明授权
    Method for transmission of unicast control in broadcast/multicast transmission time intervals 有权
    在广播/组播传输时间间隔内传输单播控制的方法

    公开(公告)号：US08175021B2

    公开(公告)日：2012-05-08

    申请号：US11554959

    申请日：2006-10-31

    申请人： Aris Papasakellariou ,  Timothy M Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    发明人： Aris Papasakellariou ,  Timothy M Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    IPC分类号： H04H20/71

    CPC分类号： H04W72/1289 ,  G06Q20/10 ,  G06Q30/00 ,  G06Q40/00 ,  H04L5/0048 ,  H04L5/0053 ,  H04L12/18 ,  H04L27/2601 ,  H04L27/2602 ,  H04N21/437 ,  H04N21/44209 ,  H04W52/322 ,  H04W72/005 ,  H04W72/1205 ,  H04W72/14

    摘要： Embodiments of the invention provide methods for maximizing the bandwidth utilization in the uplink of a communication system supporting time division multiplexing between unicast and multicast/broadcast communication modes during transmission time intervals in the downlink of a communication system. This is accomplished by multiplexing at least unicast control signaling for UL scheduling assignments in TTIs supporting the multicast/broadcast communication mode. Moreover, multiplexing of unicast control signaling can also be accomplished by splitting a symbol of the multicast/broadcast TTI into two shorter symbols with the first of these two shorter symbols carrying at least unicast control signaling and the second of these shorter symbols carrying multicast/broadcast signaling.

    摘要翻译： 本发明的实施例提供了一种用于在通信系统的下行链路中的传输时间间隔期间最大化在单播和多播/广播通信模式之间支持时分复用的通信系统的上行链路中的带宽利用率的方法。 这通过在支持多播/广播通信模式的TTI中多路复用至少用于UL调度分配的单播控制信令来实现。 此外，单播控制信令的多路复用也可以通过将多播/广播TTI的符号分成两个较短的符号来实现，其中这两个较短的符号中的第一个携带至少单播控制信令，并且这些较短的符号中的第二个携带组播/广播 信令。

    Receiving a Pilot Design and Channel Estimation
    7.
    发明申请
    Receiving a Pilot Design and Channel Estimation 有权
    接收导频设计和信道估计

    公开(公告)号：US20100124297A1

    公开(公告)日：2010-05-20

    申请号：US12639422

    申请日：2009-12-16

    申请人： Aris Papasakellariou ,  Timothy M. Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    发明人： Aris Papasakellariou ,  Timothy M. Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    IPC分类号： H04L27/28 ,  H04L27/00

    CPC分类号： H04L1/06 ,  H04B7/0452 ,  H04B7/12 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226

    摘要： Embodiments of the invention provide a receiver in an OFDM based communication system adapted to perform channel estimation using a received reference signal transmitted from at least one antenna, said reference signal being substantially located into two OFDM symbols of a transmission time interval comprising of more than two OFDM symbols. A method of generating pilot structure, the pilot structure provides information to an apparatus for channel estimation in the OFDM system with a transmission time interval of seven OFDM symbols. The pilot structure comprising pilot signals from at least one transmitting antenna located in various OFDM symbols of the transmission time interval.

    摘要翻译： 本发明的实施例提供了一种基于OFDM的通信系统中的接收机，其适于使用从至少一个天线发送的接收到的参考信号来执行信道估计，所述参考信号基本上位于包含两个以上的传输时间间隔的两个OFDM符号中 OFDM符号。 一种生成导频结构的方法，导频结构向具有7个OFDM符号的传输时间间隔的OFDM系统中的信道估计装置提供信息。 所述导频结构包括来自位于所述传输时间间隔的各种OFDM符号中的至少一个发射天线的导频信号。