| 摘要 |
PURPOSE:To diversify the correlation characteristic by subjecting a Manchester- coded PN(pseudo noise) code to RZ (return to zero) code encoding. CONSTITUTION:A PN code generator 1 uses the carry signal, which has the frequency divided by (n) in an (n) frequency divider 2, as the clock signal, Ternary data for one code is set as sign data 8 and on/off data 9; and when the carry signal is generated, they are read into corresponding shift register 3 and 4 and are successively read out in accordance with the clock. Exclusive OR between the PN code and sign data is operated by a gate 5, and the output is turned on/off through a tristate buffer 11 by on/off data to perform conversion to a ternary. One of transmission and reception PN signals is multiplied by a certain pattern signal consisting of arbitrary combinations of three values to take correlations between both of them. |
