Adaptive equalization for filter bank based multicarrier systems

Waldhauser, D.S.; Baltar, Leonardo Gomes; Nossek, Josef A.

doi:10.1109/iscas.2008.4542113

Cited by 16 publications

(11 citation statements)

References 9 publications

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“…This approach leads to significantly improved results, while keeping the complexity of the algorithm still low [24] (applying it amounts to 4 eq multiplications and 2 eq additions and updating the equalizer coefficients amounts also to 4 eq multiplications and 2 eq additions): …”

Section: Complexity Of Fbmc-qammentioning

confidence: 99%

“…From now on, overlap factors of = 2 and also the typical = 4 are considered, assuming eq = 3 equalizer coefficients [25], a number within the typical range of values of 2 to 20 (more than 20 taps do not provide noticeable enhancement [24,26]). Figures 3(a) and 3(b) show the cost for the standalone transmitters implementing each waveform for = 2 and = 4, respectively.…”

Section: Complexity Comparisonsmentioning

confidence: 99%

See 1 more Smart Citation

Multicarrier Waveform Harmonization and Complexity Analysis for an Efficient 5G Air Interface Implementation

García‐Roger

Roger

Valgas

et al. 2017

Wireless Communications and Mobile Computing

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The coexistence of multiple air interface variants in the upcoming fifth generation (5G) wireless technology remains a matter of ongoing discussion. This paper focuses on the physical layer of the 5G air interface and provides a harmonization solution for the joint implementation of several multicarrier waveform candidates. Waveforms based either on cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) or on filter bank multicarrier (FBMC) are first presented through a harmonized system model. Complexity comparisons among five different waveforms are provided. Then, the complexity of a proposed configurable hardware implementation setup for waveform transmission and reception is evaluated. As a result, the harmonized transmitter and receiver exhibit 25-40% and 15-25% less complexity in floating-point operations, respectively, in comparison to two standalone implementations of the most complex waveform instances of the CP-OFDM and FBMC families. This highlights the similarities between both families and illustrates the component reuse advantages associated with the proposed harmonized solution.

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Section: Complexity Of Fbmc-qammentioning

confidence: 99%

Section: Complexity Comparisonsmentioning

confidence: 99%

Multicarrier Waveform Harmonization and Complexity Analysis for an Efficient 5G Air Interface Implementation

García‐Roger

Roger

Valgas

et al. 2017

Wireless Communications and Mobile Computing

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show abstract

“…However, it is recently shown that it only holds when the channel delay spread is small in narrow-band systems [16]. In broadband systems with relatively large channel delay spread, multi-tap equalizers have to be employed in OQAM-OFDM systems for channel equalization [17], which has a high computational complexity and may not apply well in wireless communications. To enable the simple single-tap equalizer to work well, the single-carrier frequency domain equalization (SC-FDE) with the insertion of CP was employed in OQAM-OFDM systems in [18], which requires a redundant interval with the length of both CP and the pulse shaping filter.…”

Section: Ulticarrier Modulation (Mcm) Techniquementioning

confidence: 99%

“…However, since the conventional OQAM-OFDM systems do not include a insertion of CP, most of the channel estimation methods are based on the assumption, i.e., the channel delay spread is very short, to be able to employ the simple single-tap equalizer. Otherwise, complex multi-tap equalizers have to be employed for channel equalization [17], [31]. So far, no related literatures focus on the channel estimation in CP-OQAM-OFDM systems.…”

Section: Ulticarrier Modulation (Mcm) Techniquementioning

confidence: 99%

Channel Estimation in CP-OQAM-OFDM Systems

Kong

Xia

Jiang

et al. 2014

IEEE Trans. Signal Process.

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Due to the insertion of cyclic prefix (CP), orthogonal-frequency-division multiplexing (OFDM) systems with offset quadrature amplitude modulation (OQAM) (OQAM-OFDM) and CP, denoted as CP-OQAM-OFDM, systems have more robustness to combat a multi-path fading channel and simpler and better receivers than the conventional OQAM-OFDM systems. In this paper, two channel estimators, i.e., weighted least square (WLS) and pairs of pilots (POP) are presented in CP-OQAM-OFDM systems. To evaluate the proposed WLS and POP estimators, the corresponding Cramér-Rao bounds are given for comparison. In addition, the computational complexities of the proposed estimators are analyzed as well. Simulation results demonstrate that both of the proposed channel estimators can achieve good bit error rate (BER) performance.

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“…This improvement stems from the fact that FBMC uses lower transmission power for the same bandwidth compared to OFDM [16] and therefore causes reduced interference. The proposed algorithm is able to transparently exploit this improvement and translate it in increased utility values.…”

Section: Performance Evaluationmentioning

confidence: 99%

Resource Allocation with MAC Layer Node Cooperation in Cognitive Radio Networks

Merentitis¹,

Triantafyllopoulou²

2010

International Journal of Digital Multimedia Broadcasting

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An algorithm for cooperative Dynamic Spectrum Access in Cognitive Radio networks is presented. The proposed algorithm utilizes Medium Access Control layer mechanisms for message exchange between secondary nodes that operate in license exempt spectrum bands, in order to achieve interference mitigation. A fuzzy logic reasoner is utilized in order to take into account the effect of the coexistence of a large number of users in the interference as well as to cope for uncertainties in the message exchange, caused by the nodes' mobility and the large delays in the updating of the necessary information. The proposed algorithm is applied in Filter Bank Multicarrier, as well as Orthogonal Frequency Division Multiplexing systems, and its performance is evaluated through extensive simulations that cover a wide range of typical scenarios. Experimental results indicate improved behaviour compared to previous schemes, especially in the case of uncertainties that cause underestimation of the interference levels.

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Adaptive equalization for filter bank based multicarrier systems

Cited by 16 publications

References 9 publications

Multicarrier Waveform Harmonization and Complexity Analysis for an Efficient 5G Air Interface Implementation

Multicarrier Waveform Harmonization and Complexity Analysis for an Efficient 5G Air Interface Implementation

Channel Estimation in CP-OQAM-OFDM Systems

Resource Allocation with MAC Layer Node Cooperation in Cognitive Radio Networks

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