Abstract-At the time of writing, vehicle-to-vehicle (V2V) communication is enjoying substantial research attention as a benefit of its compelling applications. However, the everincreasing tele-traffic is expected to result in overcrowding of the available band. As a first resort, multiple input multiple output (MIMO) can be utilized to enhance the attainable bandwidth efficiency or link reliability. However, in hostile V2V wireless propagation environments, the achievable multiple-antenna gain is eroded by the channel correlation. As a promising MIMO technique, spatial modulation (SM) only activates a single transmit antenna (TA) in any symbol interval and, hence, completely avoids the inter-antenna interference, hence showing robustness against channel correlation. As a further powerful solution, non-orthogonal multiple access (NOMA) has been proposed for improving the bandwidth efficiency. Inspired by the robustness of SM against channel correlation and the benefits of NOMA, we intrinsically amalgamate them into NOMA-SM in order to deal with the deleterious effects of wireless V2V environments as well as to support improved bandwidth efficiency. Moreover, the bandwidth efficiency of NOMA-SM is further boosted with the aid of a massive TA configuration. Specifically, a spatiotemporally correlated Rician channel is considered for a V2V scenario. We investigate the bit error ratio performance of NOMA-SM via Monte Carlo simulations, where the impact of the Rician K -factor, spatial correlation of the antenna array, timevarying effect of the V2V channel, and the power allocation factor is discussed. Furthermore, we also analyze the capacity of NOMA-SM. By analyzing the capacity and deriving closedform upper bounds on the capacity, a pair of power allocation optimization schemes are formulated. The optimal solutions are Manuscript received January 27, 2017; revised May 16, 2017; accepted May 20, 2017 Index Terms-Spatial modulation (SM), non-orthogonal multiple access (NOMA), massive multiple-input multipleoutput (MIMO), vehicle-to-vehicle (V2V), channel capacity, bit error ratio (BER).
The utility of NOMA along with spatial modulation technique was proposed for V2V MIMO communication in REF , and the achievable throughput as well as the corresponding optimal power allocation policies were derived.
Performance Analysis of NOMA-SM in Vehicle-to-Vehicle Massive MIMO Channels
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Computer Science