174 research outputs found
MIMO signal processing in offset-QAM based filter bank multicarrier systems
Next-generation communication systems have to comply with very strict requirements for increased flexibility in heterogeneous environments, high spectral efficiency, and agility of carrier aggregation. This fact motivates research in advanced multicarrier modulation (MCM) schemes, such as filter bank-based multicarrier (FBMC) modulation. This paper focuses on the offset quadrature amplitude modulation (OQAM)-based FBMC variant, known as FBMC/OQAM, which presents outstanding spectral efficiency and confinement in a number of channels and applications. Its special nature, however, generates a number of new signal processing challenges that are not present in other MCM schemes, notably, in orthogonal-frequency-division multiplexing (OFDM). In multiple-input multiple-output (MIMO) architectures, which are expected to play a primary role in future communication systems, these challenges are intensified, creating new interesting research problems and calling for new ideas and methods that are adapted to the particularities of the MIMO-FBMC/OQAM system. The goal of this paper is to focus on these signal processing problems and provide a concise yet comprehensive overview of the recent advances in this area. Open problems and associated directions for future research are also discussed.Peer ReviewedPostprint (author's final draft
PAPR Analysis for Dual-Polarization FBMC
In a recent work we proposed a new radio access technique based on filter
bank multi-carrier (FBMC) modulation using two orthogonal polarizations:
dual-polarization FBMC (DP-FBMC). We showed that with good cross-polarization
discrimination (XPD), DP-FBMC solves the intrinsic imaginary interference
shortcoming of FBMC without extra processing. DP-FBMC also has other
interesting advantages over cyclic prefix orthogonal frequency-division
multiplexing (CP-OFDM) and FBMC such as more robustness in dispersive channels,
and it is also more robust to receiver carrier frequency offset (CFO) and
timing offset (TO). In this paper we analyze the peak to average power ratio
(PAPR) of DP-FBMC and compare PAPR simulation results with that of conventional
FBMC, for different prototype filters and overlapping factors. According to the
analysis and results, with a proper choice of prototype filter, DP-FBMC has
comparable PAPR to FBMC.Comment: This paper has been published in IEEE MILCOM Conference 2018. Some
results has been changed from first versio
Alamouti OFDM/OQAM systems with time reversal technique
Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude
Modulation (OFDM/OQAM) is a multicarrier modulation scheme that can be
considered as an alternative to the conventional Orthogonal Frequency Division
Multiplexing (OFDM) with Cyclic Prefix (CP) for transmission over multipath
fading channels. In this paper, we investigate the combination of the OFDM/OQAM
with Alamouti system with Time Reversal (TR) technique. TR can be viewed as a
precoding scheme which can be combined with OFDM/OQAM and easily carried out in
a Multiple Input Single Output (MISO) context such as Alamouti system. We
present the simulation results of the performance of OFDM/OQAM system in SISO
case compared with the conventional CP-OFDM system and the performance of the
combination Alamouti OFDM/OQAM with TR compared to Alamouti CP-OFDM. The
performance is derived by computing the Bit Error Rate (BER) as a function of
the transmit signal-to-noise ratio (SNR)
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