公开(公告)号：US20070217547A1

公开(公告)日：2007-09-20

申请号：US11597186

申请日：2005-05-18

申请人： Masanobu Tani

发明人： Masanobu Tani

IPC分类号： H04B1/16

CPC分类号： H04L27/2655 ,  H04L27/2685

摘要： It is an object of the present invention to provide a receiver which, when receiving a digital broadcast, can shorten a time necessary for performing an initial synchronization. The receiver comprises: a front end which receives an OFDM-modulated digital broadcast and outputs modulation signals Sch1 and of at least two channels, which modulation signals and are contained in the digital broadcast; a channel decoder which receives one modulation signal Sch1 through an A/D converter and obtains an initial synchronism to decode the modulation signal; a channel decoder which receives the other modulation signal through an A/D converter and obtains an initial synchronism to decode the modulation signal. The channel decoders, upon obtaining initial synchronisms, will mutually output and share synchronism signals. When one channel decoder is to newly obtain an initial synchronism, such an initial synchronism can be obtained in accordance with a synchronism signal outputted from the other channel decoder which has already obtained an initial synchronism, thereby shortening a time necessary for performing initial synchronization.

摘要翻译： 本发明的目的是提供一种接收机，当接收数字广播时，可以缩短执行初始同步所需的时间。 接收机包括：前端，其接收OFDM调制的数字广播，并且输出调制信号并且包含在数字广播中的调制信号Sch 1和至少两个信道; 信道解码器，通过A / D转换器接收一个调制信号Sch1并获得初始同步，以对调制信号进行解码; 信道解码器，其通过A / D转换器接收另一调制信号，并获得初始同步以解调调制信号。 通道解码器在获得初始同步时将相互输出并共享同步信号。 当一个信道解码器要新获得初始同步时，可以根据从已经获得初始同步的另一信道解码器输出的同步信号获得这种初始同步，从而缩短了执行初始同步所需的时间。

公开(公告)号：US20050113048A1

公开(公告)日：2005-05-26

申请号：US10989427

申请日：2004-11-17

申请人： Yutaka Miyahara ,  Masahiro Tsushima ,  Masanobu Tani ,  Sei Kato

发明人： Yutaka Miyahara ,  Masahiro Tsushima ,  Masanobu Tani ,  Sei Kato

IPC分类号： H04J11/00 ,  H04B7/08 ,  H04B17/02 ,  H04B1/00 ,  H04B1/06

CPC分类号： H04B7/0874

摘要： Two of set antennas are selected by a selecting unit, and transmission signals output from the two antennas are demodulated individually and combined. Moreover, quality levels of the transmission signals output from the antennas are detected by a detecting unit. When the quality level of the transmission signal output from at least either one of the antennas is lower than a predetermined level, a control unit selects two antennas from among the three or more antennas based on the quality levels of the transmission signals output from the antennas. Consequently, when the quality level of the transmission signal output from a selected antenna falls below the predetermined level, optimum antennas can be selected based on the detected quality levels of the transmission signals with an improvement to the reception quality. Thus, a receiver which selects optimum antennas while minimizing the number of times of antenna switching can be provided.

摘要翻译： 通过选择单元选择两组天线，并且从两个天线输出的发送信号被单独解调并组合。 此外，由天线输出的发送信号的质量水平由检测单元检测。 当从至少一个天线输出的发送信号的质量水平低于预定水平时，控制单元基于从天线输出的发送信号的质量水平从三个以上的天线中选出2个天线 。 因此，当从所选择的天线输出的发送信号的质量水平降低到预定水平以下时，可以基于检测到的发送信号的质量水平来选择最佳天线，同时改善接收质量。 因此，可以提供在最小化天线切换次数的同时选择最佳天线的接收机。