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：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.