Patent ID: 7406066
Filing Date: 2008-07-29
Classification: H04B,H04J

Abstract:
1. A method to asynchronously demodulate CDMA signal for multiple access applications, comprising: a. Coding transmitting signal by selecting special PN codes from all available PN codes, b. Coding CDMA signal by bipolar code in a transmitter, c. Transmitting carry modulated CDMA bipolar signals at a carry radio frequency that does not have to be exactly the same as different transmitters, d. Asynchronous demodulation to remove the carry frequency and convert the bipolar CDMA to on-off CDMA signals in a receiver, e. Converting the on-off CDMA signals to polar CDMA signals in the receiver, f. Detecting signal from a desired transmitter by despreading the CDMA signals in the receiver and minimizing MAI in a receiver.