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Improving Spectral Efficiency of Non-Orthogonal Space Time Block Coded-Continuous Phase Modulation

Kazuyuki MORIOKA, Satoshi YAMAZAKI, David ASANO

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Summary :

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.

Publication
IEICE TRANSACTIONS on Communications Vol.E101-B No.9 pp.2024-2032
Publication Date
2018/09/01
Publicized
2018/03/14
Online ISSN
1745-1345
DOI
10.1587/transcom.2018EBP3018
Type of Manuscript
PAPER
Category
Wireless Communication Technologies

Authors

Kazuyuki MORIOKA
  Electronic Navigation Research Institute, National Institute of Maritime, Port and Aviation Technology
Satoshi YAMAZAKI
  Numazu College
David ASANO
  Shinshu University

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