专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4857858A Digital demodulation system having independently operating cross-polarization cancellers 失效
标题翻译：具有独立操作的交叉极化消除器的数字解调系统
公开(公告)号：US4857858A
公开(公告)日：1989-08-15
申请号：US186285
申请日：1988-04-26
申请人： Masato Tahara
发明人： Masato Tahara
IPC分类号： H04J11/00 , H04B7/00
CPC分类号： H04B7/002
摘要： In a digital radio transmission in which first- and second-channel radio frequency digital signals are transmitted respectively on othogonally polarized radiowaves and first and second IF signals are derived respectively from the first- and second-channel RF signals. The second IF signal is proportioned in response to a control signal and subtractively combined with the first IF signal. A main digital demodulator provides demodulation on the combined IF signals to generate a main (N+1)-bit output and derives an N-bit data signal from N higher significant bits of the (N+1)-bit output and an error component from the LSB of the main (N+1)-bit output. An auxiliary digital demodulator provides demodulation of the second IF signal to generate an auxiliary (N+1)-bit output and derives a data component of the second channel from the MSB of the auxiliary (N+1)-bit output. The derived error and data components are supplied to a correlator to generate the control signal.

2. 发明授权

US4575862A Cross-polarization distortion canceller for use in digital radio communication receiver 失效
标题翻译：用于数字无线电通信接收机的交叉极化失真消除器
公开(公告)号：US4575862A
公开(公告)日：1986-03-11
申请号：US563364
申请日：1983-12-20
申请人： Masato Tahara , Toshihiko Ryu
发明人： Masato Tahara , Toshihiko Ryu
IPC分类号： H04B7/00 , H04B1/10
CPC分类号： H04B7/002
摘要： The present invention features a cross-polarization distortion canceller for use in a digital radio communication receiver, wherein error signal compensation is achieved by providing the baseband signals and the error signals using the same recovered signal or by using an error signal compensating circuit wherein carrier signals are compared in phase for generating adjusted error signals.
摘要翻译：本发明的特征在于在数字无线电通信接收机中使用的交叉极化失真消除器，其中通过使用相同的恢复信号提供基带信号和误差信号或通过使用误差信号补偿电路来实现误差信号补偿，其中载波信号在相位进行比较以产生调整后的误差信号。

3. 发明授权

US4757266A Demodulation system capable of establishing synchronization in a transient state 失效
标题翻译：解调系统能够在瞬态状态下建立同步
公开(公告)号：US4757266A
公开(公告)日：1988-07-12
申请号：US896985
申请日：1986-08-15
申请人： Yasuharu Yoshida , Masato Tahara , Manabu Yagi , Toru Matsuura
发明人： Yasuharu Yoshida , Masato Tahara , Manabu Yagi , Toru Matsuura
IPC分类号： H04L27/38 , H03D3/18 , H03K9/10
CPC分类号： H04L27/38
摘要： In a demodulation system comprising a demodulator (22) which demodulates a quadrature amplitude modulated signal into first and second sets of output digital signals by the use of a reference carrier signal (CA), a specific phase control signal is produced in a transient state by discriminating a plurality of areas and a plurality of zones defined on a phase plane of the modulated signal. The areas are defined by dividing the phase plane by both a pair of quadrant reference axes and a pair of auxiliary reference axes phase shifted by .pi./4 (radians) relative to the quadrant decision axes. The zones are defined along and adjacent to the auxiliary reference axes. First and second detection signals (S.sub.1 and S.sub.2) are produced by a read-only memory (35) as results of discrimination of the areas and the zones, respectively. The specific phase control signal is switched to a normal phase control signal produced in a normal state in the known manner. Alternatively, the first and the second detection signals may be supplied to a transversal equalizer (21) for controlling imaginary part weighting control signals.
摘要翻译：在包括通过使用参考载波信号（CA）将正交幅度调制信号解调为第一和第二组输出数字信号的解调器（22）的解调系统中，特定相位控制信号在过渡状态下由鉴别在调制信号的相位平面上限定的多个区域和多个区域。这些区域通过将相位平面除以一对象限参考轴和相对于象限决定轴相移相移π/ 4（弧度）的一对辅助参考轴来定义。这些区域沿着辅助参考轴线并与其相邻。第一和第二检测信号（S1和S2）分别由区域和区域的区分结果由只读存储器（35）产生。特定相位控制信号以已知的方式切换到以正常状态产生的正常相位控制信号。或者，第一和第二检测信号可以被提供给用于控制虚部加权控制信号的横向均衡器（21）。

4. 发明授权

US4688235A Cross-polarization interference canceller 失效
标题翻译：交叉极化干扰消除器
公开(公告)号：US4688235A
公开(公告)日：1987-08-18
申请号：US803132
申请日：1985-11-27
申请人： Masato Tahara , Tooru Matsuura , Toshihiko Ryu
发明人： Masato Tahara , Tooru Matsuura , Toshihiko Ryu
IPC分类号： H04B7/00 , H04B1/10
CPC分类号： H04B7/002
摘要： In order to reset a cross-polarization interference canceller for use in a digital radio communications receiver, two polarized-signal discriminators are provided in a manner to be coupled respectively to receive reproduced digital data from the corresponding demodulators. In the event that the demodulator produces an output not characteristic thereof, the corresponding polarized-signal discriminator produces a reset signal to reset the canceller.
摘要翻译：为了复位用于数字无线电通信接收机的交叉极化干扰消除器，以分别耦合的方式提供两个偏振信号鉴别器，以便从相应的解调器接收再现的数字数据。在解调器产生不是其特征的输出的情况下，相应的偏振信号鉴别器产生复位信号以复位消除器。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式