in this thesis, the performance of space shift keying (ssk) modulation, a technique for multiple input multiple output (mimo) wireless communication systems is studied. the results are analyzed and compared assuming absence as well as presence of co-channel interference (cci). ssk modulation is based on the concept of spatial modulation (sm) technique for mimo systems. in sm, only one transmitting antenna remains in the state of action at a single point in time while others remain in sleep mode, resulting in no inter channel interference (ici). this is another reason for the increase in system performance and spectral e ciency. unlike sm, in ssk modulation there is no transmission of data symbols. however, the index of transmitting antenna is transmitted, resulting in advantages such as a reduction in detection complexity and hardware cost as there is no need for amplitude phase modulation (apm) elements at both transmitting and receiving end. in this work, the exact analytical expression for average bit error rate (aber) of ssk modulation in the presence of cci has been derived, and the same is further supported by matlab simulated results. the analysis with cci is necessary because the spectral e ciency of the communication system can be improved by a reduction in the re-use factor of the co- channel; however, reducing the re-use factor also raises the co-channel interference. performance for the systems with single as well as multiple receiving antennas has been analyzed twice considering correlated and uncorrelated rayleigh fading channels. the asymptotic analysis results for uncorrelated rayleigh fading channels have also been derived and compared with exact results.