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In this paper, we introduce further our recently designed family of L2orthogonal Space-Time codes for CPM. With their advantage of maintaining boththe constant envelope properties of CPM, the diversity of Space-Time codes andmoreover orthogonality, and thus reduced decoding complexity, these codes arealso full rate, even for more than two transmitting antennas. The issue ofpower efficiency for these codes is first dealt with by proving that theinherent increase in bandwidth in these systems is quite moderate. It is thendetailed how the initial state of the code influences the coding gain and hasto be optimized. For the two and three antennas case, we determine the optimalvalues by computer simulations and show how the coding gain and therewith thebit error performance are significantly improved by this optimization.

Optimized L2-Orthogonal STC CPM for 3 Antennas