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We study the possibility of removing the cyclic prefix (CP) overhead from orthogonal frequency division multiplexing (OFDM) in massive multiple-input multiple-output (MIMO) systems. We consider the uplink transmission, while our results are applicable to the downlink as well. The absence of CP increases the spectral efficiency in expense of intersymbol interference and intercarrier interference. It...
We perform an asymptotic study on the performance of filter bank multicarrier (FBMC) in the context of massive multi-input multi-output (MIMO). We show that the signal-to-interference-plus-noise ratio (SINR) cannot grow unboundedly by increasing the number of base station (BS) antennas, and is upper bounded by a certain deterministic value. This is a result of the correlation between the multi-antenna...
This paper studies the possibility of eliminating the redundant cyclic prefix (CP) of orthogonal frequency division multiplexing (OFDM) in massive multiple-input multiple-output systems. The absence of the CP increases the bandwidth efficiency at the expense of intersymbol interference (ISI) and intercarrier interference (ICI). It is known that in massive MIMO, different types of interference fade...
This paper presents a comparison of the conventional filter bank multicarrier (FBMC) with the generalized frequency division multiplexing (GFDM) and cyclic FBMC (C-FBMC) that have recently been proposed as waveforms candidates for 5G. We identify situations where FBMC outperforms GFDM/C-FBMC, as well as the cases where GFDM/C-FBMC provide more flexibility than FBMC.
Underwater acoustic (UWA) channels are characterized by low availability of bandwidth, large propagation delays and fast varying multipaths. The fast variation of multipaths, in particular, hampers the bandwidth efficiency of UWA channels, as a significant percentage of transmission resources should be allocated to pilots. The problem magnifies further in the case of multiple-input multiple-output...
This paper presents a study of the candidate waveforms for 5G when they are subject to timing and carrier frequency offset. These waveforms are: orthogonal frequency division multiplexing (OFDM), generalized frequency division multiplexing (GFDM), universal filtered multicarrier (UFMC), circular filter bank multicarrier (C-FBMC), and linear filter bank multicarrier (FBMC). We are particularly interested...
Application of filter bank multicarrier (FBMC) as an effective method for signaling over massive MIMO channels has been recently proposed. This paper further expands the application of FBMC to massive MIMO by applying frequency spreading equalization (FSE) to these channels. FSE allows us to achieve a more accurate equalization. Hence, higher number of bits per symbol can be transmitted and the bandwidth...
In underwater acoustic (UWA) communications, the mobility of communicating vehicles results in a change of the time scale in the received signal. This is called Doppler scaling. Doppler scaling, although small (usually 1%, or smaller), impacts the receiver performance significantly, if uncompensated. This paper suggests a novel method for compensating Doppler scaling in filter bank multicarrier (FBMC)...
Pilot contamination problem in massive MIMO networks operating in time-division duplex (TDD) mode can limit their expected capacity to a great extent. This paper addresses this problem in cosine modulated multitone (CMT) based massive MIMO networks; taking advantage of their so-called blind equalization property. We extend and apply the blind equalization technique from single antenna case to multicellular...
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