Performance of multiple SS-DS transmitted by single radiator

Modern GPS systems have employed new Binary Offset Carrier modulations (BOC), which achieve high performance in anti-jamming and code tracking. BOC modulations can be written as a sum of two coding signals. This can be generalized as multiple spread spectrum direct sequence(SS-DS) modulations transmitted by single radiator. This paper suggests that multiple spread spectrum signals should be processed as a new single signal for achieving high performance in anti-jamming and code tracking.