A New Differential Space-Time Modulation Scheme for MIMO Systems with Four Transmit Antennas

International audienceIn this paper, a new differential space-time modulation (DSTM) scheme for 4×4 multiple input multiple output (MIMO) systems is proposed. This scheme is used for MIMO systems where the channel coefficients are not available at both the transmitter and the receiver. The transmission matrices used in this scheme belong to the Weyl group. Simulation results show that this new scheme with four transmit antennas outperforms the well-known Tarokh's differential space-time block coding (DSTBC) scheme. The spectral efficiency of this scheme can be up to 3 bit/s/Hz

A New Differential Space-Time Modulation Scheme based on Weyl Group

International audienceIn this paper, a new differential space-time modulation (DSTM) scheme for 4£4 multiple input multiple output (MIMO) systems is proposed. This scheme is used for MIMO systems where the channel coefficients are not available at both the transmitters and the receivers. The transmission matrix used in this scheme is based on the Weyl group. Simulation results show that this new scheme with four transmit antennas outperforms the well-known Tarokh's differential space-time block coding (DSTBC) scheme. The spectral efficiency of this scheme can be up to 3 bps/Hz

A New Non-Coherent MIMO Scheme: Matrix Coded Modulation "MCM"

cet article a été publié dans la conférence IEEE ISCIT en Chine entre 10 et 12 octobre 2011This paper proposes a new space-time coding scheme for non-coherent MIMO systems. In this scheme, called Matrix Coded Modulation (MCM), a joint channel errorcorrecting code and space-time code is considered. Coherent systems are those for which Channel State Information (CSI) is available at the transmitters and/or at the receivers, and their performance strongly depend on the channel estimation. Generally, this CSI estimation requires the insertion of pilotsymbols in the transmitted frame which implies a spectral efficiency loss of the global system. The existing non-coherent MIMO systems like Differential Space Time Modulation (DSTM) suffer not only from the degradation of performance compared to coherent systems, but also from many constraints on the channel and the use of memory at reception. In the proposed MCM scheme, decoding can be achieved with or without CSI at the receiving antennas. Moreover, a low-complexity decoding algorithm is described and compared to the existing differential schemes

Joint Space-Time Coded Modulation and Channel Coding for Iterative Non-Coherent MIMO Schemes

cet article a été publié dans la conférence IEEE WPMC 2011(3-6octobre)International audienceA new joint channel-coding, modulation and spacetime coding scheme is proposed as a new multi-antenna Multi- Input Multi-Output (MIMO) scheme called "Matrix Coded Modulation" or "MCM". The existing non-coherent schemes such as the Differential Space-Time Modulation (DSTM) leads to performance degradation compared to coherent systems in which perfect channel state information (CSI) is assumed. Decoding in the MCM schemes is performed iteratively, based on specified detection criteria. This new scheme is also adapted for coherent and non-coherent systems. The polynomial distribution of the Euclidean distance based on the detection criteria depends on the Hamming minimal distance of the channel-error correcting code employed in the MCM scheme

Waveform Design for 5G and beyond Systems

5G traffic has very diverse requirements with respect to data rate, delay, and reliability. The concept of using multiple OFDM numerologies adopted in the 5G NR standard will likely meet these multiple requirements to some extent. However, the traffic is radically accruing different characteristics and requirements when compared with the initial stage of 5G, which focused mainly on high-speed multimedia data applications. For instance, applications such as vehicular communications and robotics control require a highly reliable and ultra-low delay. In addition, various emerging M2M applications have sparse traffic with a small amount of data to be delivered. The state-of-the-art OFDM technique has some limitations when addressing the aforementioned requirements at the same time. Meanwhile, numerous waveform alternatives, such as FBMC, GFDM, and UFMC, have been explored. They also have their own pros and cons due to their intrinsic waveform properties. Hence, it is the opportune moment to come up with modification/variations/combinations to the aforementioned techniques or a new waveform design for 5G systems and beyond. The aim of this Special Issue is to provide the latest research and advances in the field of waveform design for 5G systems and beyond