公开(公告)号：US20070172000A1

公开(公告)日：2007-07-26

申请号：US11645793

申请日：2006-12-27

申请人： Katsuaki Hamamoto ,  Sanshirou Shiina ,  Takeshi Sakamoto

发明人： Katsuaki Hamamoto ,  Sanshirou Shiina ,  Takeshi Sakamoto

IPC分类号： H04L27/00

CPC分类号： H04L27/34 ,  H04L27/2602

摘要： A general purpose of the present invention includes providing a high-quality transmission in a multi-level modulation. Signal points to which symbols are to be assigned are not fixed and the positions of the signal points are varied for each transmission so as to reduce the symbols assigned only to the signal points having low error resilience. The assignment of bits in each symbol and an arrangement rule for the signal points in a QAM modulation scheme are varied per transmission so as to prevent any particular symbol from constantly exhibiting the low error resilience. The error rate is reduced and the throughput is enhanced.

摘要翻译： 本发明的一般目的包括在多级调制中提供高质量的传输。 要分配符号的信号点不是固定的，并且信号点的位置对于每个传输是变化的，以便减少仅分配给具有低错误弹性的信号点的符号。 每个符号中的比特分配和QAM调制方案中的信号点的布置规则在每个传输中是变化的，以便防止任何特定的符号不断地呈现低的错误弹性。 错误率降低，吞吐量提高。

公开(公告)号：US07170922B2

公开(公告)日：2007-01-30

申请号：US10144855

申请日：2002-05-15

申请人： Sanshirou Shiina ,  Norihisa Takayama

发明人： Sanshirou Shiina ,  Norihisa Takayama

IPC分类号： H04B1/69

CPC分类号： H04B1/707 ,  H04B2201/709709

摘要： In a mobile radio terminal at transmission timing control device, transmit data spread-modulated is delayed by a timing control portion with a timing of reception as a reference by a predetermined period of time having based on a unit time corresponding to a chip clock and it is then provided to a filtering portion. The filtering portion limits the transmit data in band and a timing control portion times transmission with a slight adjustment with an oversampling clock, a quadruple in frequency of the chip clock, serving as a unit time. In a mobile radio terminal at a digital roll-off filter, input digital data is held in accordance with a data period by a shift register successively. A counter counts in accordance with an oversampling period of 1/m and it is reset in accordance with a data period. A coefficient select circuit is driven by the counter's output to select and output repetitively, sequentially tap coefficients corresponding to m sampling points included in the data period for each tap output of the shift register. A multiplication circuit multiplies tap outputs by corresponding output tap coefficients and an addition circuit sums up such multiplications and provides the sum as a filter output.

摘要翻译： 在发送定时控制装置的移动无线终端中，扩频调制的发送数据被定时控制部分延迟，定时控制部分以接收定时作为参考，基于与芯片时钟对应的单位时间的预定时间段 然后被提供给过滤部分。 过滤部分通过过采样时钟（芯片时钟的频率的四倍）作为单位时间的频率和定时控制部分来限制发送数据，同时进行轻微的调整。 在数字滚降滤波器的移动无线电终端中，依次通过移位寄存器根据数据周期保持输入数字数据。 计数器根据1 / m的过采样周期进行计数，并根据数据周期进行复位。 系数选择电路由计数器的输出驱动，对移位寄存器的每个抽头输出的数据周期内包括的m个采样点对应的顺序抽头系数进行重复选择和输出。 乘法电路将抽头输出乘以对应的输出抽头系数，并且加法电路将这种乘法相加，并将和作为滤波器输出。