(i9) United States
(12) Patent Application Publication oo) Pub. No.: US 2007/0264964 Al
Birmingham (43) Pub. Date: Nov. 15,2007
(75) Inventor: Kiley Birmingham, Seattle, WA (US)
STOEL RIVES LLP
900 SW FIFTH AVENUE
PORTLAND, OR 97204-1268 (US)
(73) Assignee: Airbiquity, Inc., Seattle, WA
(21) Appl. No.: 11/442,705
(22) Filed: May 26, 2006
Related U.S. Application Data
(60) Provisional application No. 60/790,225, filed on Apr. 7, 2006.
(51) Int. CI.
H04Q 7/20 (2006.01)
H04M 11/00 (2006.01)
(52) U.S. CI 455/403
A receiver with a time diversity combining component recovers a digital data signal transmitted over a voice channel of a digital wireless telecommunications network. A feature extraction module receives an audio frequency waveform encoding the digital data signal and generates a feature vector representing the digital data signal. A bit sequence estimation module analyzes the feature vector and generates an estimated bit sequence corresponding to the digital data signal. A memory stores the feature vector if the estimated bit sequence contains errors. A time diversity combining component generates a second estimated bit sequence by analyzing the first feature vector in combination with one or more feature vectors stored in the memory.