Patent ID: 9645249
Date: 2017-05-09
CPC Classifications: G01S,H04B,H04W

Claim:
1. A method for selecting codes to be used within positioning signals sent from one or more transmitters, the method comprising: identifying a set of codes, wherein a magnitude of an autocorrelation function of each member of the set of codes, within a specified zonal region adjacent to a peak of the autocorrelation function, is below a first prescribed value; identifying a subset of codes, from among two or more subsets of codes in the identified set of codes, that optimizes a performance criterion, wherein the performance criterion is associated with a relationship between members within the subset of codes; transmitting, from a first transmitter, a first positioning signal that is modulated with a first code of the identified subset of codes; and transmitting, from a second transmitter, a second positioning signal that is modulated with a second code of the identified subset of codes.