It is known that multiple trellis coded PSK (MTC-PSK) can achieve larger performance gain, and trellis coded continuous phase modulation (CPM) combined with Multi-h scheme can also achieve good power bandwidth tradeoffs. In this paper, we propose multiple trellis coded CPFSK (MTC-CPFSK), combined with Multi-h scheme to achieve further coding gain over MTC-PSK. We find that MTC-CPFSK with Multi-h scheme achieves lager squared minimum Euclidean distance and diminishes the number of merge events up to 10Ts depth in the state trellis. We also find that the number of merge events whose squared Euclidean distance is near to squared minimum Euclidean distance may be increased by employing MTC-CPFSK, compared to TC-CPFSK.

This letter describes a millimeter wave slot array antenna using a rectangular waveguide and a ferrite. The radiation direction of the leaky wave from the slot array can be scanned by applying a dc bias magnetic field parallel to the ferrite. The radiation pattern of a prototype antenna has been measured at 40 GHz. The main beam direction changes from 10 to 3 degree by the bias magnetic field of 0.73 T.