Silicon Integrated Systems Corporation

Shuenn-Ren Liu

Ching-Kae Tzou

Min-Chieh Chen

Shih-Chung Yin

Yang-Chung Tseng

A collision detection method for a multiple access communication system is disclosed. By using the error term of a time-domain equalized signal as a detection source, an operation on the error term can be performed to determine whether collision occurs. For example, the mean square error and/or maximum value of the real part and/or imaginary part of the error term can be calculated or selected to distinguish the collision and non-collision situations. A collision detection apparatus for a multiple access communication system is also disclosed. The collision detection apparatus utilizes an existent adaptive equalizer and signal processing device for obtaining received information data bits to obtain the error term. The error term is further processed by a mean-square-error or maximum-absolute-value operator to determine the collision status.

Collision detection method and apparatus for multiple access communication system

A digital-to-analog converting method operating under two clock signals of different periods is disclosed. The method includes steps of monitoring a phase relationship between the two clock signals; starting transmission of a plurality of pre-stored series of waveform samples in response to each rising edge of the first clock signal, wherein a phase difference is present between every two adjacent series of waveform samples; outputting the waveform samples of each series in response to rising edges of the second clock signal; and selecting one of the plurality of pre-stored sets of waveform samples to be converted into an analog signal according to the phase relationship. The various pre-stored series of waveform samples having therebetween phase differences are optionally used for phase compensation so as to reduce the clock jitter between the two clock signals. A digital-to-analog converter for implementing the above-mentioned method is also disclosed.

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Taipei, Taiwan

Shuenn-Ren Liu