Iterative frequency-domain equalizers for adjacent channel interference suppression

Dinis, Rui; Falconer, D.D.; Ng, B.K.

doi:10.1109/glocom.2005.1578439

Cited by 10 publications

(14 citation statements)

References 8 publications

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“…But, the situ- ation is now changing. Single-carrier transmission is capturing spotlight again due to feasibility of adaptive equalization with less computation complexity like frequency domain equalizer (FDE), even though channel memory length is relatively long [3]- [8].…”

Section: Introductionmentioning

confidence: 99%

Frequency Domain Nulling Filter and Turbo Equalizer in Suppression of Interference for One-Cell Reused Single-Carrier TDMA Systems

Sritiapetch

Sampei

2009

IEICE Trans. Commun.

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SUMMARYThis paper proposes a frequency domain nulling filter and Turbo equalizer to suppress interference in the uplink of one-cell reuse single-carrier time division multiple access (TDMA) systems. In the proposed system, the desired signal in a reference cell is interfered by interference signals including adjacent-channel interference (ACI), co-channel interference (CCI), and intersymbol interference (ISI). At the transmitter, after a certain amount of spectrum is nulled considering the expected CCI, the suppressed power due to nulling is reallocated to the remaining spectrum components so as to keep the total transmit power constant. In this process, when mitigation of ACI is necessary, after a certain amount of spectrum at both edges is nulled using an edge-removal filter, the aforementioned process is conducted. At the receiver, frequency domain SC/MMSE Turbo equalizer (FDTE) is employed to suppress ISI due to spectrum nulling process in the transmitter as well as the multipath fading. Computer simulations confirm that the proposed scheme is effective in suppression of CCI, ACI and ISI in one-cell reuse single-carrier TDMA systems. key words: interference suppression, nulling filter, frequency domain turbo equalizer, single-carrier transmission

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Section: Introductionmentioning

confidence: 99%

Frequency Domain Nulling Filter and Turbo Equalizer in Suppression of Interference for One-Cell Reused Single-Carrier TDMA Systems

Sritiapetch

Sampei

2009

IEICE Trans. Commun.

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“…The By extending the analytical approach of [7], it can be shown that the optimum feedforward coefficients in the MMSE sense can be written as…”

Section: Receiver Structurementioning

confidence: 99%

“…We consider an iterative frequency-domain multiuser receiver based on the receiver proposed in [7]. Each iteration consists of P detection stages, one for each user.…”

Section: Receiver Structurementioning

confidence: 99%

Frequency-Domain Multiuser Detection for Highly Overloaded DS-CDMA Systems

Silva

Dinis

2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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Abstract-A DS-CDMA (Direct Sequence-Coded Division Multiple Access) system has maximum spectral efficiency if the system is fully loaded (i.e., the number of users is equal to the spreading factor) and we employ signals with bandwidth equal to the chip rate. However, due to implementation constraints we need to employ signals with higher bandwidth, decreasing the system's spectral efficiency. In this paper we consider prefixassisted DS-CDMA systems with bandwidth that can be significantly above the chip rate. To allow high spectral efficiency we consider highly overloaded systems where the number of users can be twice the spreading factor or even more. To cope with the strong interference levels we present an iterative frequencydomain receiver that takes full advantage of the total bandwidth of the transmitted signals. Our performance results show that the proposed receiver can have excellent performance, even for highly overloaded systems. Moreover, the overall system performance can be close to the maximum theoretical spectral efficiency, even with transmitted signals that have bandwidth significantly above the chip rate.

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“…The basic idea is to have several channels sharing the same bandwidth and to perform the joint detection of all channels. Therefore, our receiver can be regarded as the extension of the receiver proposed in [8] to the case where we have co-channel interference (CCI) instead of ACI. However, our scenario is much more difficult because in the ACI case the channels at the edge of the band typically have much lower interference levels than the channels in the middle of the band, while in the CCI case typically all channels can have strong interference levels.…”

Section: Introductionmentioning

confidence: 99%

“…This concept can be extended to SC-FDE schemes [8], [9], [10]. A promising receiver for SC-FDE schemes with strong ACI levels is the multiuser frequency-domain receiver proposed in [8] that can be regarded as an iterative block decision feedback equalization (IB-DFE) receiver [11], [12] with multiuser detection and ACI cancellation, allowing excellent performance in the presence of strong ACI levels.…”

Section: Introductionmentioning

confidence: 99%

A Spectrally Efficient Transmission Scheme for Signals with Large Bandwidth

Silva

Dinis

2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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Abstract-In this paper we consider single-carrier with frequency-domain equalization (SC-FDE) schemes where the transmission bandwidth is above the symbol rate. To allow high spectral efficiencies, several channels share the same bandwidth. Since the co-channel interference (CCI) levels can be very high, we propose iterative FDE receivers where we jointly detect all users sharing the same channel. Our performance results show that we can have excellent performances, even with several users sharing the same channel. In fact, we can have the maximum theoretical spectral efficiency even with signals that have bandwidth substantially above the symbol rate.

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Iterative frequency-domain equalizers for adjacent channel interference suppression

Cited by 10 publications

References 8 publications

Frequency Domain Nulling Filter and Turbo Equalizer in Suppression of Interference for One-Cell Reused Single-Carrier TDMA Systems

Frequency Domain Nulling Filter and Turbo Equalizer in Suppression of Interference for One-Cell Reused Single-Carrier TDMA Systems

Frequency-Domain Multiuser Detection for Highly Overloaded DS-CDMA Systems

A Spectrally Efficient Transmission Scheme for Signals with Large Bandwidth

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