A Novel Sparse Transmission Scheme for Efficient Mobile Radio Communications

Applications like multi user and distributed MIMO can benefit from a sparse transmission scheme due to a reduced inter-cell and inter-cluster interference. In this paper, the so-called start stop bit method, which presents a new type of transmission with sparse resource usage is studied. Several enhancements are analyzed such as i) transmitting multiple stop bit sequences, ii) adding sparse stop bit areas representing artificial fractional time frequency shifts, iii) adding a given MCS over the stop bit areas, and iv) compressing the permutation matrix needed for multiple stop bit sequences. Bit error rate curves of the proposed transmission scheme are analyzed and suitable parameter sets are provided that lead to the highest throughput per set of resource elements for a given sparsity level in comparison with a conventional OFDMA system.