Riddhi Parmar and  Shilpi Gupta and  Upena Dalal,  Comparison of BER Performances for Conventional and Non-Conventional Mapping Schemes Used in OFDM.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2011, vol. 57(9). 1232 - 1235
    [viewed 07 December 2019]. Available from: https://publications.waset.org/pdf/14776.