Unique word detector

Abstract

Abstract PURPOSE:To obtain an excellent unique word detecting characteristic by using a soft deciding data for an input reception signal, calculating the multi-dimension Euclid distance to a unique (UW) word pattern while keeping the soft deciding data as it is so as to detect the UW. CONSTITUTION:Soft dividing reception signals PR51, QR52 demodulated by a soft diciding demodulator are inputted to the shift register 57 of correlation devices P53, Q54 at every clock respectively. The difference between stored UW patterns P55, Q56 and the content of the shift register 57 is calculated by a clock subtractor 58 in the correlation devices P53, Q54, the result is squared by a square device 64 and inputted to an adder 59. The adder 59 totalizes the squared samples and inputs the total sum SIGMA to a comparator 60. A permissible Euclid distance epsilon is set in advance in the comparator 60 and when the relation of SIGMA<=epsilon<2> exists, a pulse is outputted and inputted to a AND circuit 62. When the pulse is outputted while a UW detection gate signal forecasting the arrival time of the UW in advance is enabled in a terminal station, the pulse passes through the AND circuit 62 and is outputted as a UW detection pulse 63.

Inventors

• 👤 Tadashi Fujino
• 👤 藤野　忠

Bibliographic Details