Joint detection and channel estimation for block transmission schemes

Coelho, Fabio; Dinis, Rui; Montezuma, Paulo

doi:10.1109/milcom.2010.5680240

Cited by 5 publications

(6 citation statements)

References 9 publications

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“…We consider a SC-FDE transmissions with 8-PSK coded by a convolutional code of polynomials [5,7] 8 , K = 128, over the Proakis C channel (h = [1; 2; 3; 2; 1]/ √ 19). Prior channel estimates are obtained through a pilot-aided LS estimation, with K P = 10, and we compare the performance of the three variants of the EP-based receiver (EM, MF, EP-QA), with mismatched CSI (p(h) = δ(h − h 0 )) and with a perfect CSI receiver.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Conventional turbo-iterative equalizers [1], based on Gaussian-approximated belief propagation (GaBP) messagepassing on factor graphs [2] use soft data estimates from the decoder feedback, to improve detection for systems with bit-interleaved coded-modulation (BICM). These soft estimates are also usable for data-aided channel estimation [3], as demonstrated for multi-carrier [4] or single-carrier systems with frequency domain equalization (SC-FDE) [5].…”

Section: Introductionmentioning

confidence: 99%

“…In these works, FD data symbols are discrete variables (for instance, due to the use of orthogonal frequency domain multiplexing, i.e. OFDM), which allows for low-complexity message computations, however this is not the case for SC-FDE systems, for which alternative joint estimation techniques have been investigated in [5,13].…”

Section: Introductionmentioning

confidence: 99%

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Joint Frequency Domain Channel Estimation and Equalization Based on Expectation Propagation for Single Carrier Transmissions

Sahin¹,

Cipriano²,

Poulliat³

et al. 2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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In this paper, a novel category of expectation propagation (EP) based frequency domain (FD) semi-blind receivers are proposed for single-carrier block transmissions. A recently proposed EP-based framework for deriving double-loop turbo detectors is extended to handle joint data-aided channel estimation along with EP-based soft interference cancellation (IC). When addressing this problem in a message passing framework, an unconventional probability density function prevent us from establishing analytical update functions for estimating data and channel estimates. This is solved with variational inference methods, such as mean-field (MF), expectation maximization (EM) or EP, using a three-loop receiver structure with flexible performance-complexity tradeoff, thanks to fast Fourier transform (FFT) based processing.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joint Frequency Domain Channel Estimation and Equalization Based on Expectation Propagation for Single Carrier Transmissions

Sahin¹,

Cipriano²,

Poulliat³

et al. 2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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“…It is assumed perfect synchronization and channel estimation. This can be obtained with the help of appropriate training blocks and/or pilots [24][25][26]. The channel estimation segments are similar to other SC-FDE schemes [27].…”

Section: System Characterizationmentioning

confidence: 99%

Receiver design for the uplink of base station cooperation systems employing SC-FDE modulations

Ribeiro

Dinis

Cercas

et al. 2015

J Wireless Com Network

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The presented paper considers the uplink transmission in base station (BS) cooperation schemes where mobile terminals (MTs) in adjacent cells share the same physical channel. We consider single-carrier with frequency-domain equalization (SC-FDE) combined with iterative frequency-domain receivers based on the iterative block decision feedback equalization (IB-DFE). We study the quantization requirements when sending the received signals, from different MTs, at different BSs to a central unit that performs the separation of different MTs using iterative frequency-domain receivers. Our performance results show that a relatively coarse quantization, with only 4 bits in the in-phase and quadrature components of the complex envelope already allows close-to-optimum macro-diversity gains, as well as an efficient separation of the transmitted signals associated with each MT.

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“…In order to decrease the amount of information to be transmitted in the backhaul link, the signals received at each BS are firstly quantized with an ADC block. In this paper, we assume perfect channel estimation [17] and synchronization, trough the assist of suitable training pilots and/or blocks [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Robust receivers for base station cooperation systems

Ribeiro

Guerreiro

Dinis

et al. 2017

Digital Signal Processing

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In BS (Base Station) cooperation architectures the MTs (Mobile Terminals) in adjacent cells can operate in the same frequency, with the signal's separation and/or MTs detection being performed by a CPU (Central Processing Unit). This results in a substantial improvement in the overall system's capacity and spectral efficiency when compared to conventional cellular systems. To decrease the data load in the backhaul links, the received signals at a given BS must be sampled and quantized before being sent to the CPU, which results in a significant increase of quantization errors. We consider the uplink of BS cooperation schemes employing SC-FDE (Single-Carrier with Frequency-Domain Equalization) modulations and a detection performed through receivers based on the IB-DFE (Iterative Block Decision Feedback Equalization) concept. We present accurate approaches for obtaining the spectral characterization of the quantization noise. Moreover, we propose the design of robust receivers that can take into account the quantization noise effects.

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Joint detection and channel estimation for block transmission schemes

Cited by 5 publications

References 9 publications

Joint Frequency Domain Channel Estimation and Equalization Based on Expectation Propagation for Single Carrier Transmissions

Joint Frequency Domain Channel Estimation and Equalization Based on Expectation Propagation for Single Carrier Transmissions

Receiver design for the uplink of base station cooperation systems employing SC-FDE modulations

Robust receivers for base station cooperation systems

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