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    • 5. 发明授权
    • Clock recovery and hold circuit for digital TDM mobile radio
    • 用于数字TDM移动无线电的时钟恢复和保持电路
    • US4953185A
    • 1990-08-28
    • US255576
    • 1988-10-05
    • Steven H. Goode
    • Steven H. Goode
    • H04L7/00H04L7/033
    • H04L7/033H04L7/0083
    • A clock recovery circuit for a digital TDM mobile radio transceiver is disclosed. In the "acquisition mode", a first phase-locked loop is configured to acquire synchronization with the input data signal, and a second phase-locked loop is coupled to the first PLL's output signal, thereby providing the recovered clock signal. The controller monitors the transmit control line and the received signal strength so as to switch the clock recovery circuit into a second configuration during a TDM transmit burst or a received signal fade. In this "hold mode", the second PLL is configured to free-run within a specified tolerance, while the first PLL is coupled to the second PLL's output signal. The controller maintains this "hold" configuration until the received signal is again present, and until the first PLL again acquires synchronization to the input data signal. In this manner, the controller prevents the recovered clock signal from losing bit synchronization or phase synchronization during transmit bursts, during the transmit-to-receive synthesizer out-of-lock period, or during Rayleigh fades. The present invention is particularly adapted for use in a TDM system utilizing 0.2 GMSK modulation, wherein there is less apparent clock signal available for clock recovery.
    • 公开了一种用于数字TDM移动无线电收发机的时钟恢复电路。 在“采集模式”中,第一锁相环被配置为获取与输入数据信号的同步,并且第二锁相环耦合到第一PLL的输出信号,从而提供恢复的时钟信号。 控制器监视发射控制线和接收信号强度,以便在TDM发射突发期间或接收信号衰落期间将时钟恢复电路切换到第二配置。 在该“保持模式”中,第二PLL被配置为在规定的容限内自由运行,而第一PLL被耦合到第二PLL的输出信号。 控制器保持这种“保持”配置,直到接收信号再次存在,并且直到第一PLL再次获得与输入数据信号的同步。 以这种方式,控制器防止恢复的时钟信号在发射到接收合成器超时期间或在瑞利衰落期间在传输突发期间丢失比特同步或相位同步。 本发明特别适用于利用0.2GMSK调制的TDM系统,其中有较少的表观时钟信号可用于时钟恢复。
    • 6. 发明授权
    • Method and coherent demodulators for MSK signal
    • MSK信号的方法和相干解调器
    • US4539524A
    • 1985-09-03
    • US567119
    • 1983-12-30
    • Steven H. Goode
    • Steven H. Goode
    • H04L27/18H04L27/227H04L27/14
    • H04L27/2276
    • Improved method and apparatus in the form of coherent demodulators for MSK signal or other angle-modulated carrier signals of substantially constant amplitude and continuous phase are provided. The coherent demodulators include a frequency doubler, a first mixer for multiplying the frequency doubled signal with a half clock signal to produce a carrier term signal, a bandpass filter for filtering the carrier term signal and a divider coupled to the carrier bandpass filter to produce a coherent carrier signal. The half clock signal is generated by multiplying the frequency doubled signal with the filtered ouput signal of the carrier bandpass filter by a second mixer, and bandpass filtering the output signal of the second mixer to produce the half clock signal. The received binary data modulated signal and the generated coherent carrier signal are input to a quadrature detector for recovering the binary data.
    • 提供了用于MSK信号或基本恒定幅度和连续相位的其他角度调制载波信号的相干解调器形式的改进的方法和装置。 相干解调器包括倍频器,用于将倍频信号与半时钟信号相乘以产生载波项信号的第一混频器,用于滤波载波项信号的带通滤波器和耦合到载波带通滤波器的分频器,以产生 相干载波信号。 通过第二混频器将倍频信号与载波带通滤波器的滤波输出信号相乘产生半时钟信​​号,并对第二混频器的输出信号进行带通滤波以产生半时钟信​​号。 接收到的二进制数据调制信号和所产生的相干载波信号被输入到正交检波器以恢复二进制数据。
    • 10. 发明授权
    • Method for channel adaptive detecting/equalizing
    • 通道自适应检测/均衡方法
    • US5375143A
    • 1994-12-20
    • US985474
    • 1992-12-03
    • Henry L. KazeckiSteven H. GoodeDonald W. DennisJames C. BakerKevin L. BaumBruce D. Mueller
    • Henry L. KazeckiSteven H. GoodeDonald W. DennisJames C. BakerKevin L. BaumBruce D. Mueller
    • H04B7/005H04L27/22H03H7/30
    • H04B7/005H04L27/22
    • In a communications device, two coherent detection algorithms (102 and 103), one of which has a decision feedback equalizer (103), and a detector selection algorithm (104) are used to dynamically select a detector depending on whether delay spread distortion is present. First the correlation of the detector without the equalizer (102) is measured. If this correlation is greater than a predetermined threshold, the data from that detector (102) is used by the communications device. If the correlation is less than the threshold, the correlation of the detector with the equalizer (103) is measured. If this is less than the correlation of the detector without the equalizer (102), the data from the detector without the equalizer (102) is used, otherwise the data is taken from the equalizer (103). In any case, if the detector without the equalizer is used, the detector with the equalizer is turned off.
    • 在通信设备中,使用两个相干检测算法(102和103),其中之一具有判决反馈均衡器(103)和检测器选择算法(104),以根据是否存在延迟扩展失真来动态地选择检测器 。 首先测量没有均衡器(102)的检测器的相关性。 如果该相关性大于预定阈值,则来自该检测器(102)的数据由通信设备使用。 如果相关性小于阈值,则测量检测器与均衡器(103)的相关性。 如果这小于没有均衡器(102)的检测器的相关性,则使用来自没有均衡器(102)的检测器的数据,否则数据取自均衡器(103)。 在任何情况下,如果使用没有均衡器的检测器,则使用均衡器的检测器关闭。