H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/185 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01)
Patent
CA 2048933
A time division PLL is composed of a complex multiplier (1), a phase difference detector (2), a low-pass filter (3), an adder (4) and a digital VCO (5). A D.C. value indicating the recovered carrier component of a receive burst is obtained by a squaring circuit (9) from a baseband signal, which is the output of the complex multiplier (1). The time division PLL operates as a PLL having frequency different lead-in ranges on a time division basis, differing between the period in which no burst has been received yet and the period in which the former part of the carrier recovery section of the receive burst is being received. It operates, from the latter part of the carrier recovery section until the completion of data reception, as a PLL having the frequency pull-in range in which the greatest D.C. value was outputted during the time division operation.
Otani Susumu
Tsuda Hiroki
Corporation Nec
Smart & Biggar
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