公开(公告)号：PL347692A1

公开(公告)日：2002-04-22

申请号：PL34769299

申请日：1999-10-12

Applicant: ERICSSON TELEFON AB L M

Inventor： SOUROUR ESSAM ,  BOTTOMLEY GREGORY E ,  KOILPILLAI R DAVID

IPC: G06F17/15 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/26 ,  H04L7/00 ,  H04B1/707

Abstract: A receiver in a communications system is operated by receiving a radio communications signal transmitted by a station of the communications system and generating a correlation output representing a correlation of the received radio communications signal and a subsequence of a modulation sequence that is selected based on a correlation between the selected subsequence and the modulation sequence. The receiver is then synchronized based on the generated correlation output. The selected subsequence preferably has an optimal out-of-phase correlation with the modulation sequence. According to an aspect of the present invention, the selected subsequence has a minimum out of phase correlation with the modulation sequence in comparison to other subsequences of the modulation sequence. For example, the selected subsequence may have a "minimum maximum" out-of-phase correlation value, a "minimum aggregate" out-of-phase correlation metric, or a combination thereof.

公开(公告)号：PL348910A1

公开(公告)日：2002-06-17

申请号：PL34891099

申请日：1999-10-15

Applicant: ERICSSON TELEFON AB L M

Inventor： RYDBECK NILS ,  MOLNAR BARBARA ,  GUEY JIANN-CHING ,  KHAYRALLAH ALI ,  KOILPILLAI R DAVID

IPC: H04J11/00 ,  H04L20060101 ,  H04L1/00 ,  H04L1/20 ,  H04L1/22 ,  H04M1/00 ,  H04Q7/38

Abstract: In a wireless communications system, information is communicated over one of a first communications channel having a first redundancy level or a second communications channel having a second redundancy level based on a determination of communications quality for at least one of the channels. In embodiments of the present invention, communications occur over a first channel, e.g., a "standard" channel until a measure of communications quality for that channel, such as bit error rate or frame error rate, meets a predetermined criterion. When the communications quality meets the predetermined criterion, communications shifts to a "robust" high-penetration channel that utilizes substantially the same amount of spectral resource as the first channel but provides significantly increased redundancy. In other embodiments, a terminal, e.g., a cellular radiotelephone or other radio terminal, registers with a wireless communications system via one of a standard broadcast control channel or a high-penetration broadcast control channel, and switches therebetween based upon a determination of communications quality for the standard broadcast control channel. For example, the terminal may switch to the high-penetration broadcast control channel upon failure to acquire the standard broadcast control channel in a disadvantaged reception area.