Multiplex communications – Communication over free space – Combining or distributing information via time channels
Patent
1997-06-06
2000-11-28
Olms, Douglas W.
Multiplex communications
Communication over free space
Combining or distributing information via time channels
370343, 370324, H04J 306
Patent
active
061544574
ABSTRACT:
A method is disclosed for operating a mobile station (10). The method includes a first step of receiving a forward channel from a base station (30), the forward channel being transmitted to contain repeating frames each comprising N time slots, individual ones of the time slots including a synchronization word. A second step of the method correlates an i.sup.th one of the N time slots using a first correlation sequence (SYNC 1) and a second correlation sequence (SYNC 4) to obtain a first correlation result and a second correlation result, respectively. A third step of the method declares the forward channel to be one of a half-rate channel or a full-rate channel based on the first and second correlation results. In an exemplary embodiment N is equal to six, and i is equal to four. In the exemplary embodiment the first N/2 of the time slots are transmitted to have a same sequence of N/2 synchronization words whether the channel is a half-rate channel or a full-rate channel. In this embodiment i is equal to (N/2)+1.
REFERENCES:
patent: 5199031 (1993-03-01), Dahlin
patent: 5680421 (1997-10-01), Shiino
patent: 5726981 (1998-03-01), Ylitervo
patent: 5819174 (1998-10-01), Kyllonen
patent: 5838672 (1998-11-01), Ranta
patent: 5883929 (1999-03-01), Wang
Nokia Mobile Phones Limited
Olms Douglas W.
Pizarro Ricardo M.
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