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

Ribeiro, F. Casal; Dinis, Rui; Cercas, Francisco; Silva, Adão

doi:10.1186/s13638-014-0237-6

Cited by 24 publications

(24 citation statements)

References 29 publications

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“…For instance, in [8,9], the authors discussed power allocation under various criteria for a downlink NOMA system. In order to improve the system throughput, a network NOMA technique was proposed and analysed for the uplink coordinated multi-point transmission (CoMP) in [10].Cooperative communications is another solution to mitigate the fading effects of wireless environments [11]. NOMA in cooperative communication systems is commonly referred to as cooperative-NOMA (C-NOMA), which is able to enhance the system reliability [12].…”

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confidence: 99%

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I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

Tian

et al. 2020

Electronics

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Non-orthogonal multiple access (NOMA) system can meet the demands of ultra-high data rate, ultra-low latency, ultra-high reliability and massive connectivity of user devices (UE). However, the performance of the NOMA system may be deteriorated by the hardware impairments. In this paper, the joint effects of in-phase and quadrature-phase imbalance (IQI) and imperfect successive interference cancellation (ipSIC) on the performance of two-way relay cooperative NOMA (TWR C-NOMA) networks over the Rician fading channels are studied, where two users exchange information via a decode-and-forward (DF) relay. In order to evaluate the performance of the considered network, analytical expressions for the outage probability of the two users, as well as the overall system throughput are derived. To obtain more insights, the asymptotic outage performance in the high signal-to-noise ratio (SNR) region and the diversity order are analysed and discussed. Throughout the paper, Monte Carlo simulations are provided to verify the accuracy of our analysis. The results show that IQI and ipSIC have significant deleterious effects on the outage performance. It is also demonstrated that the outage behaviours of the conventional OMA approach are worse than those of NOMA. In addition, it is found that residual interference signals (IS) can result in error floors for the outage probability and zero diversity orders. Finally, the system throughput can be limited by IQI and ipSIC, and the system throughput converges to a fixed constant in the high SNR region.Electronics 2020, 9, 249 2 of 16 signals of other users with lower channel gains before decoding their own signals based on the SIC technique [7]. Hence, NOMA can support multiple users with limited resources and improve spectral efficiency, which has attracted considerable attention from academia and industry. For instance, in [8,9], the authors discussed power allocation under various criteria for a downlink NOMA system. In order to improve the system throughput, a network NOMA technique was proposed and analysed for the uplink coordinated multi-point transmission (CoMP) in [10].Cooperative communications is another solution to mitigate the fading effects of wireless environments [11]. NOMA in cooperative communication systems is commonly referred to as cooperative-NOMA (C-NOMA), which is able to enhance the system reliability [12]. The authors analysed the effect of the power allocation coefficient on the error performance under a one-way relay C-NOMA system in [13]. The authors in [14] presented a new system detection scheme for a one-way relay C-NOMA system, which used the maximal ratio combining (MRC) and SIC to decode signals. Sheng Luo et al. in [15] proposed an adaptive transmission scheme based on a one-way relay C-NOMA network with a dedicated relay, which could temporarily store the received information. Recently, two-way relaying (TWR) has attracted a great deal of research attention because of its ability to achieve higher spectral efficiency in comparison to one-way relayin...

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confidence: 99%

“…Cooperative communications is another solution to mitigate the fading effects of wireless environments [11]. NOMA in cooperative communication systems is commonly referred to as cooperative-NOMA (C-NOMA), which is able to enhance the system reliability [12].…”

mentioning

confidence: 99%

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

Tian

et al. 2020

Electronics

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“…However, this approach is only accurate for quantizers with high quantization levels but no saturation effects. Since the signals that are received at each BS present Gaussian-like characteristics, it is possible to obtain the quantization noise variance according to [13], as long as the signal to be quantized has a flat spectrum [14]. Gaussian approximation is reasonable for multipath channels, even with a single user.…”

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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“…This paper considers the uplink of BS cooperation systems where each MT employs a SC-FDE modulation scheme [9]. The combined signals received at a given BS are sent to a CPU via RoF technology, in which the electro-optic and opticelectric conversions are done through a Mach-Zehnder (MZ) modulator [10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Effects of Radio over Fiber Transmission in Base Station Cooperation Systems

Ribeiro

Guerreiro

Dinis

et al. 2017

2017 IEEE Globecom Workshops (GC Wkshps)

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In this paper we consider the uplink of Base Station (BS cooperation) systems, where each Mobile Terminal (MT) employs a Single-Carrier with Frequency-Domain Equalization (SC-FDE) modulation scheme. The combined signals at each BS are detected and/or separated by a Central Processing Unit (CPU) with Iterative Block Decision Feedback Equalization (IBDFE) receivers. We consider a Radio-overFiber (RoF) link between the BS and the CPU, the electrical and optical conversions are performed by a Mach-Zehnder (MZ) modulator, which introduces nonlinear distortion. We design robust receivers that take advantage of the statistical characteristics of the nonlinear distortion

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

Cited by 24 publications

References 29 publications

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

Robust receivers for base station cooperation systems

Nonlinear Effects of Radio over Fiber Transmission in Base Station Cooperation Systems

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