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Improving Spectral Efficiency of Non-orthogonal Space Time Block coded-Continuous Phase Modulation

IEICE TRANSACTIONS ON COMMUNICATIONS 2018年第9期E101B卷 2024-2032页

作者： Morioka, Kazuyuki Yamazaki, Satoshi Asano, David Natl Inst Maritime Port & Aviat Technol Elect Nav Res Inst Surveillance & Commun Dept Tokyo 1820012 Japan Numazu Coll Natl Inst Technol Dept Control & Comp Engn Numazu 4108501 Japan Shinshu Univ Dept Comp Sci & Engn Nagano 3808553 Japan

We consider space time block coded-continuous phase modulation (STBC-CPM), which has the advantages of both STBC and CPM at the same time. A weak point of STBC-CPM is that the normalized spectral efficiency (NSE) is limited by the orthogonality of the STBC and CPM parameters. The purpose of this study is to improve the NSE of STBC-CPM. The NSE depends on the transmission rate (TR), the bit error rate (BER) and the occupied bandwidth (OBW). First, to improve the TR, we adapt quasi orthogonal-STBC (QO-STBC) for four transmit antennas and quasi-group orthogonal toeplitz code (Q-GOTC) for eight transmit antennas, at the expense of the orthogonality. Second, to evaluate the BER, we derive a BER approximation of STBC-CPM with non-orthogonal STBC (NO-STBC). The theoretical analysis and simulation results show that the NSE can be improved by using QO-STBC and Q-GOTC. Third, the OBW depends on CPM parameters, therefore, the tradeoff between the NSE and the CPM parameters is considered. A computer simulation provides a candidate set of CPM parameters which have better NSE. Finally, the adaptation of non-orthogonal STBC to STBC-CPM can be viewed as a generalization of the study by Silvester et al., because orthogonal STBC can be thought of as a special case of non-orthogonal STBC. Also, the adaptation of Q-GOTC to CPM can be viewed as a generalization of our previous letter, because linear modulation scheme can be thought of as a special case of non-linear modulation.

关键词： continuous phase modulation space time block code quasi orthogonal-space time block code group orthogonal toeplitz code

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