公开(公告)号：US4071829A

公开(公告)日：1978-01-31

申请号：US740365

申请日：1976-11-09

申请人： Robert Curtis Davis ,  Daniel Dix McRae

发明人： Robert Curtis Davis ,  Daniel Dix McRae

IPC分类号： H04L27/14 ,  H03D3/02

CPC分类号： H04L27/14

摘要： A coherent phase detector using a frequency discriminator for reducing a frequency encoded signal to baseband, thereby avoiding the necessity of generating a coherent RF phase reference signal. A baseband processor is provided to compensate for error components arising in the frequency discriminator output. The baseband processor includes feedback loops for DC level correction and automatic gain correction. A novel scheme is also described for reducing the influence of interbit crosstalk on the operation of the baseband processor.

摘要翻译： 一种相干相位检测器，其使用频率鉴别器将频率编码信号减小到基带，从而避免产生相干RF相位参考信号的必要性。 提供基带处理器来补偿在鉴频器输出中产生的误差分量。 基带处理器包括用于直流电平校正和自动增益校正的反馈回路。 还描述了一种新颖的方案来减少串扰串扰对基带处理器的操作的影响。

公开(公告)号：US4015238A

公开(公告)日：1977-03-29

申请号：US634904

申请日：1975-11-24

申请人： Robert Curtis Davis

发明人： Robert Curtis Davis

IPC分类号： H04L1/00 ,  G06F11/12

CPC分类号： H04L1/0054

摘要： In a convolutional code decoder, a current received input corresponds to a last data state of a received sequence. Path metrics, respective correlations of the received sequence to each of a limited number of possible sequences, are determined to choose the "correct" possible sequence. Decoding then proceeds by known means. The current input addresses "look-up" memories, each associated with a possible input data state and providing a "branch metric address" output. "Update" memories, each associated with one of the data states, are each addressed by path metrics of prior sequences which can enter its associated state and by one "branch metric address." In functional effect, each "update" memory adds a separate branch metric to update each prior path metric leading into each state. Path metrics for the limited number of possible sequences are thus provided. An indication of which updated path metric is larger for each state and its value are output from each "update" memory. The largest of the updated path metrics provided by the memories identifies the "correct" possible sequence.

摘要翻译： 在卷积码解码器中，当前接收的输入对应于接收序列的最后数据状态。 确定接收到的序列与有限数量的可能序列中的每一个的相应相关性的路径度量，以选择“正确”可能的序列。 解码然后以已知方式进行。 当前输入寻址“查找”存储器，每个存储器与可能的输入数据状态相关联并提供“分支度量地址”输出。 每个与数据状态之一相关联的“更新”存储器都通过可以进入其关联状态的先前序列的路径度量和一个“分支度量地址”来寻址。 在功能效果中，每个“更新”存储器添加单独的分支度量以更新导致每个状态的每个先前的路径度量。 因此提供了有限数量的可能序列的路径度量。 从每个“更新”存储器输出每个状态的更新路径度量值更大的指示及其值。 由存储器提供的更新的路径度量中最大的标识了“正确”可能的顺序。