1,180 research outputs found
Single-Carrier Modulation versus OFDM for Millimeter-Wave Wireless MIMO
This paper presents results on the achievable spectral efficiency and on the
energy efficiency for a wireless multiple-input-multiple-output (MIMO) link
operating at millimeter wave frequencies (mmWave) in a typical 5G scenario. Two
different single-carrier modem schemes are considered, i.e., a traditional
modulation scheme with linear equalization at the receiver, and a
single-carrier modulation with cyclic prefix, frequency-domain equalization and
FFT-based processing at the receiver; these two schemes are compared with a
conventional MIMO-OFDM transceiver structure. Our analysis jointly takes into
account the peculiar characteristics of MIMO channels at mmWave frequencies,
the use of hybrid (analog-digital) pre-coding and post-coding beamformers, the
finite cardinality of the modulation structure, and the non-linear behavior of
the transmitter power amplifiers. Our results show that the best performance is
achieved by single-carrier modulation with time-domain equalization, which
exhibits the smallest loss due to the non-linear distortion, and whose
performance can be further improved by using advanced equalization schemes.
Results also confirm that performance gets severely degraded when the link
length exceeds 90-100 meters and the transmit power falls below 0 dBW.Comment: accepted for publication on IEEE Transactions on Communication
Hybrid beamforming for single carrier mmWave MIMO systems
Hybrid analog and digital beamforming (HBF) has been recognized as an
attractive technique offering a tradeoff between hardware implementation
limitation and system performance for future broadband millimeter wave (mmWave)
communications. In contrast to most current works focusing on the HBF design
for orthogonal frequency division multiplexing based mmWave systems, this paper
investigates the HBF design for single carrier (SC) systems due to the
advantage of low peak-to-average power ratio in transmissions. By applying the
alternating minimization method, we propose an efficient HBF scheme based on
the minimum mean square error criterion. Simulation results show that the
proposed scheme outperforms the conventional HBF scheme for SC systems.Comment: IEEE GlobalSIP2018, Feb. 201
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