Patent ID: 9503153
Filing Date: 2016-11-22
CPC Classification: G01S,H04B,H04J,H04L

Claim Text:
1. A method for generating a spread spectrum Gaussian Minimum Shift Keying (GMSK) signal comprising the acts of: obtaining a sequence of data symbols for a data channel; obtaining at least one first spread spectrum code comprising a first sequence of spread spectrum chips for the data channel; obtaining at least one second spread spectrum code comprising a second sequence of spread spectrum chips for a pilot channel; generating a sequence of pre-modulation chips by combining the sequence of data symbols for the data channel with the spread spectrum chips of the first sequence of the at least one first spread spectrum code and data symbols for the pilot channel with the spread spectrum chips of the second sequence of the at least one second spread spectrum code to a combined sequence of chips; assigning the chips of the combined sequence of chips to the transmission channels In-Phase I and Quadrature Q of the spread spectrum GMSK signal so that not more than two consecutive pre-modulation chips generated with the same spread spectrum code are transmitted in the same transmission channel I or Q; performing GMSK modulation using the sequence of pre-modulation chips to generate the spread spectrum GMSK signal; obtaining one first spread spectrum code and one second spread spectrum code; assigning pre-modulation chips generated with the first spread spectrum code to the transmission channels In-Phase I and Quadrature Q of the spread spectrum GMSK signal so that two consecutive pre-modulation chips generated with the first spread spectrum code are transmitted in different transmission channels I or Q; and assigning pre-modulation chips generated with the second spread spectrum code to the transmission channels In-Phase I and Quadrature Q of the spread spectrum GMSK signal so that two consecutive pre-modulation chips generated with the second spread spectrum code are transmitted in different transmission channels I or Q.