Study On Ber Improvement In Mimo Systems Using Adaptive Modulation

Abstract: Increasing demand in high transmission capacity has to be satisfied by a better use of existing frequency bands and channel conditions. One of the recent technical breakthroughs, which will be able to provide the necessary data rates, is the use of multiple antennas at both link ends. Spatial Modulation (SM) is used in wireless systems, which can offer good data rates and error performance with a moderately low system complexity. Adaptive modulation schemes for fading channels are usually required to fulfil certain long-term average BER targets. Performance of SSK modulation increases for increasing values of the target bit rate and of the number of antennas at the receiver. This modulation has the same robustness to channel estimation errors as conventional modulation schemes. Hence a new modulation called CoMP (Coordinated MultiPoint)–SSK modulation is proposed. CoMP-SSK modulation can provide very high bit rates at the cost of network cooperation. In this paper bit error rate performance of some popular modulation schemes have been studied and compared with their results.

Keywords: Spatial modulation(SM), Space Shift Keying (SSK) modulation, Multiple-Input-Multiple-Output (MIMO), Coordinated MultiPoint (CoMP), (BER), adaptive modulation.