H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 3/06 (2006.01) H04L 1/00 (2006.01) H04L 19/00 (2006.01) H04L 25/49 (2006.01)
Patent
CA 2725321
A system is provided for transmitting information through a speech codec (in- band) such as found in a wireless communication network. A modulator transforms the data into a spectrally noise- like signal based on the mapping of a shaped pulse to predetermined positions within a modulation frame, and the signal is efficiently encoded by a speech codec. A synchronization sequence provides modulation frame timing at the receiver and is detected based on analysis of a correlation peak pattern. A request/response protocol provides reliable transfer of data using message redundancy, retransmission, and/or robust modulation modes dependent on the communication channel conditions.
L'invention concerne un système de transmission d'informations via un codec vocal (intra-bande), tel que ceux des réseaux de communication sans fil. Un modulateur transforme les données en un signal à caractère spectral de bruit en fonction de la correspondance entre une impulsion mise en forme et des positions prédéterminées dans une trame de modulation, et le signal est codé efficacement par un codec vocal. Une séquence de synchronisation, détectée d'après une analyse d'un motif de crête de corrélation, indique la synchronisation de trame de modulation au niveau du récepteur. Un protocole de requête/réponse permet un transfert fiable des données ao moyen de: redondance des messages, retransmission et/ou modes de modulation robustes, en fonction des conditions du canal de communication.
Frank Georg
Granzow Wolfgang
Huang Pengjun
Joetten Christoph A.
Pietsch Christian
Qualcomm Incorporated
Smart & Biggar
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