H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/106, 354/223
H04L 25/49 (2006.01) H03M 5/18 (2006.01) H04L 5/16 (2006.01) H04L 7/04 (2006.01)
Patent
CA 1198824
ABSTRACT There is described a method of transmitting a digital signal in a burst mode using multi-level codes prepared by converting the digital signal into absolute values of a plurality of multi-level symbols and transmitted selectively as a symbol of a first polarity, a symbol of a second polarity opposite to the first polarity, and a zero level symbol. Considering the transmission end, when the first bit of a digital signal processed into a block for transmission in correspondence with a burst is logical "1", the first symbol of the transmit burst signal is converted into a multi-level code provided with the first polarity. On the other hand, when the first bit of the digital signal is logical "0", the logical "0" of the first bit is inverted into logical "1" and the first symbol of the burst signal is converted into a multi-level code provided with the second polarity. The second and subsequent symbols are converted into a multi-level code provided with a polarity which is opposite to that of the average DC level before each symbol or, if the average DC level is zero, is opposite to that of the immediately preceding symbol except a zero level symbol. Considering the receiving end, a burst synchronization signal is extracted from the first symbol of the burst signal, the absolute value of each of the symbols is converted into a digital signal, and the first bit of the digital signal is decoded into logical "1" when the first symbol is of the first polarity, and into logical "0" when the first symbol is of the second polarity. Because the first symbol of a burst signal is always non-zero which allows a burst synchronization signal to be extracted without resorting to any additional bit or symbol for burst synchronization. Since the polarity of each symbol is so determined as to reduce the DC unbalance of a burst signal, the unbalance can be limited to within a maximum absolute value of one symbol regardless of the bit pattern of a transmit digital signal or the number of multi-level symbols. Deterioration in S/N ratio attributable to D.C. unbalance is negligible.
401010
Nippon Electric Co. Ltd.
Smart & Biggar
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