公开(公告)号：US20130251004A1

公开(公告)日：2013-09-26

申请号：US13891027

申请日：2013-05-09

Applicant: HARRIS CORPORATION

Inventor： YUTAKA MURAKAMI ,  SHINICHIRO TAKABAYASHI ,  MASAYUKI ORIHASHI ,  AKIHIKO MATSUOKA

IPC: H04B1/711

CPC classification number: H04B1/711 ,  H04B1/707 ,  H04B1/7075 ,  H04B2201/70705 ,  H04B2201/70716 ,  H04B2201/70728 ,  H04J13/00 ,  H04L1/0003 ,  H04L1/0023 ,  H04L5/0007 ,  H04L5/0016 ,  H04L5/0044 ,  H04L5/0048 ,  H04L27/18 ,  H04L27/227 ,  H04L27/2602 ,  H04L27/2662 ,  H04L27/34 ,  H04L27/364 ,  H04L27/38 ,  H04L2027/004 ,  H04L2027/0061

Abstract: A transmitting apparatus includes an OFDM modulator that generates a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being at a first position in an in-phase quadrature-phase plane. A second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the modulated second information signal is arranged to a third position in the in-phase quadrature-phase plane, and an OFDM modulation signal including the first modulation symbol and the second modulation symbol, wherein the OFDM modulation signal comprises a plurality of subcarriers.

Abstract translation: 发送装置包括OFDM调制器，其通过使用第一调制方式调制第一信息信号来生成第一调制符号，第一调制信息信号的信号点处于同相正交相位平面中的第一位置。 第二调制符号，通过使用第一调制方案调制第二信息信号，并且通过改变调制的第二信息信号的信号点被布置在同相正交相位平面中的第三位置的第二位置，以及 包括第一调制符号和第二调制符号的OFDM调制信号，其中OFDM调制信号包括多个子载波。

公开(公告)号：US20130243132A1

公开(公告)日：2013-09-19

申请号：US13889614

申请日：2013-05-08

Applicant: HARRIS CORPORATION

Inventor： KIYOTAKA KOBAYASHI ,  YUTAKA MURAKAMI ,  MASAYUKI ORIHASHI

IPC: H04L27/26

CPC classification number: H04L27/2649 ,  H04W52/42

Abstract: A radio transmitting apparatus that has a plurality of antennas and changes the number of modulated signals transmitted simultaneously according to the propagation environment and so forth. A transmission power changing section 12 of a radio transmitting apparatus of the present invention adjusts the pilot symbol signal level so as to match the data symbol composite signal level according to the number of transmit modulated signals set by a modulated signal number setting section 11. By this means, the operating range of received pilot symbols and the operating range of received data symbols become approximately the same on the receiving side, enabling pilot symbol quantization error to be reduced. As a result, the precision of radio wave propagation environment estimation, time synchronization, and frequency offset estimation using pilot symbols improves, and consequently data reception quality improves.

Abstract translation: 具有多个天线的无线发送装置，根据传播环境等改变同时发送的调制信号的数量。 本发明的无线发送装置的发送功率变更部12根据由调制信号编号设定部11设定的发送调制信号的数量来调整导频符号信号电平，使其符合数据符号合成信号电平。通过 这意味着接收到的导频符号的操作范围和接收数据符号的操作范围在接收侧变得大致相同，从而能够降低导频符号量化误差。 结果，使用导频符号的无线电波传播环境估计，时间同步和频率偏移估计的精度提高，因此提高了数据接收质量。

公开(公告)号：US20130251008A1

公开(公告)日：2013-09-26

申请号：US13890973

申请日：2013-05-09

Applicant: HARRIS CORPORATION

Inventor： YUTAKA MURAKAMI ,  SHINICHIRO TAKABAYASHI ,  MASAYUKI ORIHASHI ,  AKIHIKO MATSUOKA

IPC: H04L7/04

CPC classification number: H04L7/04 ,  H04L7/06 ,  H04L27/0008 ,  H04L27/206 ,  H04L27/34 ,  H04L27/3405 ,  H04L27/3455 ,  H04L2027/0024 ,  H04L2027/0087 ,  H04L2027/0093

Abstract: In a multivalue modulation type with one pilot symbol inserted for every 3 or more symbols, signal points of each one symbol immediately before and after a pilot symbol are modulated using a modulation type different from that for pilot symbols. In this way, it is possible to suppress deterioration of the accuracy in estimating the reference phase and amount of frequency offset by pilot symbols and improve the bit error rate characteristic in the signal to noise ratio in quasi-coherent detection with symbols whose symbol synchronization is not completely established.