Diversity and equalization in frequency domain a robust and flexible receiver technology for broadband mobile communication systems

Kadel, G.

doi:10.1109/vetec.1997.600458

Cited by 43 publications

(18 citation statements)

References 6 publications

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“…9, is considered a robust and efficient receiver solution for very dispersive channels like those in broadband wireless communications [13], [33]. Consider a single-carrier block-wise transmission with CP as described earlier.…”

Section: A Frequency-domain Diversity Combining and Equalizationmentioning

confidence: 99%

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Frequency-Domain Set-Membership Filtering and Its Applications

Guo

Huang

2007

IEEE Trans. Signal Process.

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Abstract-Frequency-domain adaptive filtering is appealing in many applications, particularly channel equalization. This paper presents frequency-domain set-membership filtering (F-SMF) and derives adaptive algorithms for F-SMF. The F-SMF is employed to design single-carrier frequency-domain equalizer (SC-FDE). With an unconventional parameter-dependent error-bound specification, an F-SMF algorithm is derived and shown to provide superior performance with sparse updates of parameter estimates. Exploring the feature of sparse updates, we present an innovative parallel adaptive architecture that shares the updating processors and that finds natural appeal in frequency-domain diversity combining and equalization for very dispersive fading channels like those found in broadband wireless communications.Index Terms-Adaptive frequency-domain equalization, frequency-domain filters, parallel adaptive subsystems, set-membership filtering, updator-sharing.

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Section: A Frequency-domain Diversity Combining and Equalizationmentioning

confidence: 99%

“…If the input statistics and the channel information of each subchannel are known perfectly, the optimum combining and equalization weight can be obtained from MRC and LMMSE [13], [33]. However, such information is often unknown in practice, thus adaptive algorithms would be preferred.…”

Section: A Frequency-domain Diversity Combining and Equalizationmentioning

confidence: 99%

Frequency-Domain Set-Membership Filtering and Its Applications

Guo

Huang

2007

IEEE Trans. Signal Process.

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“…In recent years, the combination of SC-FDE with MIMO has received more attention in the literature [2][3][4][5][6][7][8][9][10][11][12]. The design of SC-FDE based on minimum mean square error criterion for a spatial multiplexing (SM) MIMO system has been proposed in [2] and [3].…”

Section: Introductionmentioning

confidence: 99%

Improved Frequency Domain Channel Estimation and Equalization for MIMO Wireless Communications

Zhang

Zheng

2009

Int J Wireless Inf Networks

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This paper introduces an improved frequency domain channel estimation method based on interpolation vectors for single carrier frequency domain equalization (SC-FDE) with the multiple-input multiple-output (MIMO) scheme. The proposed algorithm is derived by employing the least squares (LS) criterion, and a specified application for the wide sense stationary uncorrelated scattering (WSSUS) Rayleigh fading channel is presented. The channel frequency domain responses estimated at two adjacent pilot blocks are used to track the time-variant channel information, which can effectively improve the accuracy of channel estimation without significantly increasing complexity. Maximum mean square error (MMSE) frequency domain equalization based on the estimated channel is employed in the receiver to recover transmitted signals. This paper also investigates a training sequence design method for multiple transmit antennas and a noise variance estimation method. Numerical simulation results show that the proposed methods can perform very well for fading channels with long multipath delay and high Doppler spread.

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“…However, in [25], [26] the MMSE-FDE was operated independently in the context of the direct and relaying branches, which were then combined with the aid of a Time-Domain (TD) Equal-Gain Combiner (EGC) [27]. In [28]- [32], linear and adaptive FDEs relying on diversity combining schemes were invoked for multiple antenna aided SCor OFDM-based block transmissions. Furthermore, in [33]- [35] the receive diversity combining techniques designed for SC-FDMA and relying on cooperative relays were considered by stipulating the idealised simplifying assumption that the relays demodulate/detect the source signals perfectly, before forwarding them.…”

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confidence: 99%

Energy-Efficient Channel-Dependent Cooperative Relaying for the Multiuser SC-FDMA Uplink

Zhang

Yang

Hanzo

2011

IEEE Trans. Veh. Technol.

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Abstract-In this contribution we exploit the benefits of combining the diversity gains arising from cooperation, multiple propagation paths and from the opportunistic relaying of multiple users. Our goal is to improve the energy-efficiency of the amplify-and-forward single-relay assisted single-carrier frequency-division multiple-access uplink, where the single relay considered may support a single user or may be shared by multiple users communicating over dispersive channels subject to large-scale fading. Based on the proposed amalgam of single-tap frequency-domain equalisation and a diversity combining aided receiver relying on the minimum mean-square error criterion, three different relay selection schemes designed for either singleuser or multi-user relaying scenarios are investigated, when combined with source/relay power sharing, which employ imperfect power control. Our results demonstrate that at a bit error ratio of 10 −4 , the proposed receiver is capable of saving 2dB power by achieving a higher cooperative diversity gain than the conventional receiver. Moreover, a beneficial energy-efficiency improvement may be achieved, when the cooperative regime operates at E b /N0 < 0. Most importantly, when the shadowing variance is increased from 4dB to 8dB, the energy consumption gain gleaned from our multi-user and multi-access relay selection schemes may increase to 4∼9 compared to the direct transmission in the absence of shadowing at E b /N0 = −10dB.

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Diversity and equalization in frequency domain a robust and flexible receiver technology for broadband mobile communication systems

Cited by 43 publications

References 6 publications

Frequency-Domain Set-Membership Filtering and Its Applications

Frequency-Domain Set-Membership Filtering and Its Applications

Improved Frequency Domain Channel Estimation and Equalization for MIMO Wireless Communications

Energy-Efficient Channel-Dependent Cooperative Relaying for the Multiuser SC-FDMA Uplink

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