Abstract
Single-carrier space frequency block coding (SC-SFBC) is an innovative mapping scheme suitable for implementing transmit diversity in single-carrier frequency division multiple access (SC-FDMA) systems. The main advantage of SC-SFBC is that it preserves the low envelope variations of SC-FDMA, which is particularly interesting for the uplink of wireless communications systems. In this article, we apply the SC-SFBC concept in a multiuser multiple-input multiple-output (MU-MIMO) scenario. We introduce a novel algorithm allowing the optimization of the parameters of SC-SFBC to enable low-complexity decoding at the receiver side and to maximize the overall spectral occupancy in MU-MIMO SC-FDMA systems, and we show the good performance of the proposed MU scheme.
Highlights
Orthogonal frequency division multiple access (OFDMA) and OFDMA-based multi-carrier (MC) transmission schemes have undeniably become one of the main references in modern communications systems
It is fully proven in [11], both analytically and by means of simulation, that Single-carrier space frequency block coding (SC-SFBC) does not increase the PAPR of the resulting signal and that the signal yTx1 on the second transmit antenna Tx1 has the same PAPR as the original single-carrier frequency division multiple access (SC-FDMA) signal yTx0, both for localized and for distributed subcarrier mapping
Conclusions and future work SC-FDMA imposed itself as a good option for the uplink air interface of wireless communications systems
Summary
Orthogonal frequency division multiple access (OFDMA) and OFDMA-based multi-carrier (MC) transmission schemes have undeniably become one of the main references in modern communications systems. On the other hand, using highly linear HPAs would increase the handset cost For these reasons, the uplink physical layer of LTE [8] was chosen to be a precoded OFDMA air interface, called single-carrier frequency division multiple access (SC-FDMA). A PAPR-preserving transmit diversity technique for SC-FDMA, coined single-carrier space frequency block coding (SC-SFBC), was already introduced for user with two transmit antennas in [11], and some extensions to users with four transmit antennas were presented in a single-user (SU)-MIMO scenario. If trying to apply an Alamoutibased SFBC (i.e., precoding in the frequency domain between frequency-adjacent frequency samples s(kt00) and s(kt10=)k0+1 belonging to the same SC-FDMA symbol), this would increase the PAPR of the resulting signal, as shown in [11,16]. The advantage of SFBC is its flexibility, since it can be applied to any number of SC-FDMA symbols in a transmission burst
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