Method for extending parallel combinatory multi-code transmission with constant-amplitude signaling

In multi-code transmission system, the amplitude of the transmission signal may have sharp fluctuations, and non-linear distortion occurs in the transmission signal. To solve this problem, the authors propose two novel multi-code transmission systems with constant amplitude signaling in this paper. They compare the proposed systems with Multi-Code transmission with Constant Amplitude signaling (MC-CA) system and Parallel Combinatory Multi-Code transmission with Constant Amplitude signaling (PCMC-CA) system, from the point of view of the bit error rate (BER) performance and the amount of transmitted data. As a result, they showed that the BER performance of the proposed systems are better than that of MC-CA system in the high E_b/N₀ domain. They also showed that the amount of transmitted data of one of the proposed systems is 1.125 times as much as that of MC-CA system.