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发明授权
US6104761A Constrained-envelope digital-communications transmission system and method therefor 有权
约束包络数字通信传输系统及其方法

Constrained-envelope digital-communications transmission system and method therefor
摘要：
A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained-bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifies the constrained-envelope signal stream (112) and transmits it as a radio-frequency broadcast signal (26).
摘要（中）：

一种限制包络数字通信发射机电路（22），其中二进制数据源（32）提供输入信号流（34），相位映射器（44）将输入信号流（34）映射到正交相位点 信号流（50），每单位波特间隔（64）具有预定数量的符号，并且在相位点星座（46）中定义相位点（54），脉冲扩展滤波器（76）对相位点信号 流（50）转换成经滤波的信号流（74），约束包络发生器（106）从经滤波的信号流（74）产生约束带宽误差信号流（108），延迟元件（138） 信号流（74）转换成与受约束带宽误差信号流（108）同步的延迟信号流（140），复数求和电路（110）将延迟信号流（140）和约束带宽误差信号流 108）到约束包络信号流（112）中，并且基本上是线性的 放大器（146）放大约束包络信号流（112）并将其作为射频广播信号（26）发送。

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