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We investigate the secure degrees of freedom (SDoF) of a two-transmitterGaussian multiple access channel with multiple antennas at the transmitters,the legitimate receiver with the existence of an unknown number ofeavesdroppers each with a number of antennas less than or equal to a knownvalue $N_E$. The channel matrices between the legitimate transmitters and thereceiver are available everywhere, while the legitimate pair does not know theeavesdroppers' channels matrices. We provide the exact sum SDoF for theconsidered system. A new comprehensive upperbound is deduced and a newachievable scheme based on utilizing jamming is exploited. We prove thatCooperative Jamming is SDoF optimal even without the instantaneous eavesdropperCSI available at the transmitters.

Secure Degrees of Freedom of the MIMO Multiple Access Channel with Multiple unknown Eavesdroppers