Leonardo Gomes Baltar

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Multicarrier communication technologies are promising candidates for 4G wireless access systems. In this paper, we focus on the downlink of multicellular networks and we investigate the influence of the inter-cell interference in an unsynchronized frequency division duplex (FDD) context with a frequency resuse of 1. We compare the conventional orthogonal(More)
— Multicarrier systems are favored for contemporary and future, both stationary and mobile, communication systems. They promise a high bandwidth efficiency and at the same time the capability to cope with frequency selective (radio) channels. Unfortunately, the peak-to-average power ratio (PAPR) is increased at the transmitter of multicarrier systems(More)
— In this work we present a per-subchannel nonlinear equalizer for a class of filter bank based multicarrier (FBMC) systems. We consider the class of exponentially modulated FBMCs with offset quadrature amplitude modulated (OQAM) input symbols. We design a fractionally spaced decision feedback equalizer (DFE) that minimizes the mean squared error (MMSE) and(More)
In this contribution we thoroughly analyze the computational effort necessary to implement a multicarrier based physical layer for wireless communications. We consider two variations of this modulation concept, namely traditional cyclic pre-x based orthogonal frequency division multiplexing (CP-OFDM) and lter bank based multicarrier (FBMC) systems. First,(More)
— In this work we present a per-subchannel nonlinear adaptive equalizer for a class of filter bank based multicarrier (FBMC) systems. We consider the class of exponentially modulated FBMCs with offset quadrature amplitude modulated (OQAM) input symbols. We present a fractionally spaced adaptive decision feedback equalizer (DFE) based on the(More)
— Filter bank based multicarrier systems (FBMC) offer a number of benefits over conventional orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP). One benefit is the improved spectral efficiency by not using a redundant CP and by having much better control of out-of-band emission. Another advantage is the ease of accomodating multiple(More)
Filter Bank Based Multicarrier (FBMC) systems appears to be the best choice to replace Cyclic Prefix (CP) based Orthogonal Frequency Division Multiplexing (OFDM) as the physical layer of future wireless communications devices. Some equalizer solutions for FBMC systems already exist. Among them, the equalizers minimizing the mean square error (MMSE)(More)
—In a Filter Bank based Multicarrier (FBMC) system employed in a highly frequency selective propagation channel each subchannel experiences a multi-tap impulse response (IR). In this contribution we present an efficient method of estimating the IR of the propagation channel experienced by each subchan-nel, the so-called structured channel estimation. The(More)
—Our main emphasis is on the use of enhanced OFDM and filter bank based multicarrier (FB-MC) waveforms for utilizing effectively the available fragmented spectrum in heterogeneous radio environments. Special attention is on the broadband-narrowband coexistence scenario of the Professional Mobile Radio (PMR) evolution. The target here is to provide broadband(More)
In orthogonal frequency division multiplexing (OFDM), carrier frequency offset (CFO) must be mitigated since it generates interference between received symbols transmitted through different sub-carriers. This paper presents a new algorithm for CFO estimation with reduced computational complexity. The new approach is based on the segmentation of the(More)