Abstract: A columnar illumination component includes a columnar body and a light-emitting component. The columnar body has two first side portions, and two second side portions. Each of the first side portions is adjoined to the second side portions, each of the second side portions is adjoined to the first side portions, and an elongated channel is jointly defined by the first side portions and the second side portions. The light-emitting component is located inside the elongated channel, and includes two light guides and two light source modules where the light guides are respectively fixed on the first side portions. The light source modules are respectively fixed on the second side portions, and each of the light source modules emits lights towards one of the light guides, and outputs the lights outwardly through the light guide.

Abstract: The present invention comprises an adaptive equalizer to be implemented in a receiver to cancel the ISIs. Basically, it has a decision feedback equalizer structure including a feedforward filter and a feedback filter. The receiver further includes a gain controller to properly adjust the amplitude of the equalized signals to reduce the non-equalization bias. It also has a detector to determine the symbol value of +3 +1, -1, and -3 and for generating the error signal to update the coefficients of the equalizer via the adaptive algorithm. The adverse effect of error propagation is reduced by strengthening the function of the feedforward filter. The equalizer training period is also shorten as the gain controller provides additional information for the detector to eliminate the signal bias caused by the non-optimal coefficients of the equalizer.