Deep space communication systems operate on very long distance and the on-board energy generator capacity is very limited which results in a very low signal to noise ratio (SNR) at the reception. This is the reason why near Shannon limit error correcting codes such as Turbo codes and LDPC are used. Nevertheless, to take advantage of the coding gain, the coherent demodulation is mandatory and the carrier phase synchronization must be performed at a more restrictive SNR. To optimize the transmission spectral efficiency, The CCSDS has recommended the GMSK modulation for deep space missions. This paper discusses with a carrier phase recovery scheme derived from maximum a posteriori (MAP) criterion and Laurent expansion for GMSK BTb = 0.5 modulation scheme. One of the key technologies to improve the SNR at the ground station, while reducing the infrastructure installation cost and offering more flexibility, is the use of receiving-antenna array instead of a single large aperture antenna. We propose in this paper a novel method for antenna arraying which enhances the combiner performance by several dB in terms of SNR.