公开(公告)号：US09641371B2

公开(公告)日：2017-05-02

申请号：US14587184

申请日：2014-12-31

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Alan P Conrad

IPC: H04L27/26

CPC classification number: H04L27/2607 ,  H04L27/2663 ,  H04L27/2678

Abstract: Disclosed herein are methods and systems for dynamic single-frequency-network-(SFN)-multicast symbol synchronization. In an embodiment, a wireless-communication device (WCD) receives an SFN-multicast transmission at least in part by receiving a respective SFN-multicast-transmission signal from each site in a plurality of sites in a given SFN-multicast area, where each such received SFN-multicast-transmission signal has a respective SFN-multicast cyclic prefix. The WCD calculates a multisource multipath delay spread (“MMDS”) that is characteristic of the received plurality of SFN-multicast-transmission signals, and determines whether that calculated MMDS exceeds a threshold MMDS. If so, the WCD selects a multicast timing point that is after the SFN-multicast cyclic prefix of a first-received one of the received SFN-multicast-transmission signals. If not, the WCD selects a multicast timing point that is within the SFN-multicast cyclic prefix of the first-received SFN-multicast-transmission signal. The WCD uses the selected multicast timing point to demodulate the received SFN-multicast transmission.

公开(公告)号：US09590690B2

公开(公告)日：2017-03-07

申请号：US14574487

申请日：2014-12-18

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Alan P Conrad ,  Kevin G Doberstein

IPC: H04B1/7097

CPC classification number: H04B1/7097 ,  H04J11/004

Abstract: Disclosed herein are methods and systems for canceling a blocking signal to obtain a desired signal. An example process includes receiving both a blocking signal and a set of blocking bits corresponding to a demodulation of the blocking signal. A remodulated blocking signal is generated by modulating the received set of blocking bits. The remodulated blocking signal is passed through a blocking-band bandpass filter to generate an estimated blocking signal, and is also passed through a desired-band bandpass filter to generate an unconditioned reference signal. One or more signal-parameter differences between the blocking signal and the estimated blocking signal are identified, and one or more signal compensations are accordingly applied to the unconditioned reference signal to generate a conditioned reference signal, which is then output to a blocking-signal-canceling system.

Abstract translation: 这里公开了用于消除阻塞信号以获得期望信号的方法和系统。 示例性处理包括接收阻塞信号和对应于阻塞信号的解调的一组阻塞位。 通过调制所接收的阻塞位组来产生再调制的阻塞信号。 重新调制的阻塞信号通过阻带带通滤波器以产生估计的阻塞信号，并且还通过期望带通带通滤波器以产生无条件参考信号。 识别阻塞信号和估计阻塞信号之间的一个或多个信号参数差异，并且相应地将一个或多个信号补偿应用于未条件参考信号以产生经调节的参考信号，然后输出到阻塞信号 - 取消系统。

公开(公告)号：US09331881B2

公开(公告)日：2016-05-03

申请号：US14476297

申请日：2014-09-03

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Alan P Conrad ,  Xiaowei Jin

IPC: H04K1/10 ,  H04L27/26

CPC classification number: H04L27/2602 ,  H04L5/0044 ,  H04L27/2626 ,  H04L27/2647

Abstract: Disclosed herein are methods and systems for embedding a supplementary data channel in OFDM-based communication systems. One embodiment takes the form of a process that includes obtaining a primary data signal that includes a given symbol, where the given symbol includes primary payload data prepended with a given cyclic prefix. The process also includes obtaining supplementary payload data. The process also includes identifying an available portion of the given symbol. The process also includes generating a modified primary data signal at least in part by replacing the available portion of the given symbol with a subset of the supplementary payload data. The process also includes outputting the generated modified primary data signal for transmission via an air interface.

Abstract translation: 这里公开了用于在基于OFDM的通信系统中嵌入补充数据信道的方法和系统。 一个实施例采用包括获得包括给定符号的主数据信号的过程的形式，其中给定符号包括以给定循环前缀为前缀的主有效载荷数据。 该过程还包括获得补充有效载荷数据。 该过程还包括识别给定符号的可用部分。 该过程还包括至少部分地通过用补充有效载荷数据的子集替换给定符号的可用部分来生成修改的主数据信号。 该过程还包括输出所生成的修改的主数据信号以经由空中接口传输。