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SEVERE ERROR DETECTORS, METHODS AND COMPUTER PROGRAM PRODUCTS THAT USE CONSTELLATION SPECIFIC ERROR EVENT THRESHOLDS TO DETECT SEVERE ERROR EVENTS DURING DEMODULATION OF A SIGNAL COMPRISING SYMBOLS FROM A PLURALITY OF SYMBOL CONSTELLATIONS
SEVERE ERROR DETECTORS, METHODS AND COMPUTER PROGRAM PRODUCTS THAT USE CONSTELLATION SPECIFIC ERROR EVENT THRESHOLDS TO DETECT SEVERE ERROR EVENTS DURING DEMODULATION OF A SIGNAL COMPRISING SYMBOLS FROM A PLURALITY OF SYMBOL CONSTELLATIONS
Severe error detectors, methods, and computer program products use constellation specific error event thresholds to detect severe error events in a signal comprising symbols from a plurality of symbol constellations. In particular, a plurality of constellation thresholds are defined that correspond to a plurality of symbol or signal constellations. An output signal sample, which is associated with one of the plurality of symbol constellations, is received from a decision feedback equalizer. The absolute value of the output signal sample is compared with the constellation threshold that corresponds to the particular symbol constellation associated with the output signal sample. If the absolute value of the output signal sample exceeds the constellation threshold, then a severe error is recognized. The ITU V.90 Recommendation allows up to six different symbol or signal constellations to be used in the same communication session. The multiple constellations may be designed such that an error threshold suitable for one constellation may not be suitable for another constellation. As a result, a severe error detection circuit or module using a single constellation threshold for detecting severe errors may either under report or over report severe error events. Advantageously, multiple constellation thresholds may allow severe errors to be detected with greater precision than could be detected using a single constellation threshold.
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机译：严重错误检测器，方法和计算机程序产品使用特定于星座的错误事件阈值来检测包含来自多个符号星座的符号的信号中的严重错误事件。特别地，定义了对应于多个符号或信号星座的多个星座阈值。从判决反馈均衡器接收与多个符号星座之一相关联的输出信号样本。将输出信号样本的绝对值与对应于与输出信号样本相关联的特定符号星座的星座阈值进行比较。如果输出信号样本的绝对值超过星座图阈值，则将识别出严重错误。 ITU V.90建议书允许在同一通信会话中使用多达六个不同的符号或信号星座。可以设计多个星座，使得适合于一个星座的误差阈值可能不适合于另一星座。结果，使用单个星座图阈值来检测严重错误的严重错误检测电路或模块可能严重不足或严重不足。有利地，多个星座阈值可以允许比使用单个星座阈值可以检测到的更大的精度来检测严重错误。
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