Performance Analysis of Amplify-and-Forward Multiple-Relay MIMO Systems With ZF Reception

Darsena, Donatella; Gelli, Giacinto; Melito, F.; Verde, Francesco

doi:10.1109/tvt.2014.2349740

Cited by 15 publications

(26 citation statements)

References 32 publications

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“…3 shows the BER performance of the proposed ICA-SS assisted FD relay system in comparison to the existing methods [18], [22], [45] at SNR = 20 dB. The proposed ICA-SS-based signal separation scheme achieves a much better BER performance than the least-square (LS) CE and ZF EQ (LS CE+ZF EQ) [45], the PSP-assisted LS ZF [22] and the TSP-assisted LS ZF [18], especially in the low SRSIR range of −30 ∼ −15 dB. This is due to the adaptive SI processing mode selection, where the residual SI is treated as useful signal to enhance the degree of freedom in signal detection in PSAC-S and PS-S modes, and is treated as noise to enhance the sensitivity of semi-blind signal detection in PSAC-N and PS-N modes.…”

Section: Numerical Resultsmentioning

confidence: 99%

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

Duan

Zhu

Jiang

et al. 2020

IEEE Internet Things J.

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In this article, we propose a semi-blind full-duplex (FD) amplify-and-forward (AF) relay system with adaptive self-interference (SI) processing assisted by independent component analysis (ICA) for low-latency and high-reliability (LLHR) Internet of Things (IoT). The SI at FD relay is not necessarily canceled as much as possible like the conventional approaches, but is canceled or utilized based on a signal-to-residual-SI ratio (SRSIR) threshold at relay. According to the selected SI processing mode at relay, an ICA-based adaptive semi-blind scheme is proposed for signal separation and detection at destination. The proposed FD relay system not only features reduced signal processing cost of SI cancelation but also achieves a much higher degree of freedom in signal detection. The resulting bit error rate (BER) performance is robust against a wide range of SRSIR, much better than that of conventional FD systems, and close to the ideal case with perfect channel state information (CSI) and perfect SI cancelation. The proposed system also requires negligible spectral overhead as only a nonredundant precoding is needed for ambiguity elimination in ICA. In addition, the proposed system enables full resource utilization with consecutive data transmission at all time and same frequency, leading to much higher throughput and energy efficiency than the time-splitting and power-splitting-based self-energy recycling approaches that utilize only partial resources. Furthermore, an intensive analysis is provided, where the SRSIR thresholds for the adaptive SI H. Duan and Y. Jiang are with the

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Section: Numerical Resultsmentioning

confidence: 99%

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

Duan

Zhu

Jiang

et al. 2020

IEEE Internet Things J.

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“…The right-hand sides (RHSs) in (15) and (16) can be intuitively explained as follows. On one side, the SU transmission is beneficial since it increases the frequency diversity of the PU; mathematically, the gain in frequency diversity comes in (15) and (16) from the multiplication of ASNR PU,direct by the factor 1 + |g 23 | 2 |x SU | 2 (σ 2 12 /σ 2 13 ). On the other hand, the AF relaying carried out by the SU is detrimental, due to the noise propagation phenomenon from the STx to the PRx; mathematically, the adverse effect of noise propagation is represented in (15) by the division of ASNR PU,direct by the factor 1 + |g 23 | 2 |x SU | 2 (σ 2 n2 /σ 2 n3 ) and in (16) by the division of ASNR PU,direct by the factor 1 + σ 2…”

Section: Theorem 1 (Upper and Lower Bounds On The Pu Capacity)mentioning

confidence: 99%

“…Specifically, when the PU is inactive, the SU uses the primary channel in a conventional manner. When, however, the PU is active, the SU is still allowed to transmit its data, by employing an amplify-and-forward (AF) relaying strategy, which has been widely used in cooperative systems [9]- [16]: specifically, the PU signal received by the SU is multiplied by the information symbols of the SU and retransmitted.…”

Section: Introductionmentioning

confidence: 99%

An Amplify-and-Forward Scheme for Spectrum Sharing in Cognitive Radio Channels

Verde

Scaglione

Darsena

et al. 2015

IEEE Trans. Wireless Commun.

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In this paper, we propose a cognitive radio scheme that allows a secondary user (SU) to transmit over the same time-frequency slot of a primary user (PU), even when the PU is active. In our scheme, the SU amplifies and forwards the signal of the PU, by using as scaling factor the value of its information symbol to be transmitted towards the secondary receiver. The information-theoretic limits of the proposed protocol are investigated in terms of ergodic channel capacities of both the PU and SU links. It is shown that: (i) under certain operating conditions, the SU can superimpose its information symbols on the PU signal, without violating the cognitive radio principle of protecting the PU transmission; (ii) when the primary link is busy, the SU offers the PU its own transmitting power in exchange for a low-capacity communication channel, which improves the packet delay performance of the SU. In this barter, the tempting incentive for the PU consists of a noticeable improvement of its achievable rate at the price of a slight increase in the computational complexity of the primary receiver.Index Terms-Amplify-and-forward relaying, cognitive radio, ergodic channel capacity, wireless communications.

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“…However, the direct link between a source and a relay was absent. Although a direct link was included in [7], power allocation was absent due to the simplicity in the process of deriving approximate symbol error probability.…”

Section: Introductionmentioning

confidence: 99%

“…The differences between our paper and previous works mainly lie in three aspects. Firstly, different links: previous works often only considered either relaying link [6,17] or only direct link [7], so there was no problem in choosing which link for the source to convey messages. However, the relaying link is not always better than the direct link and vice versa due to the fluctuating channel quality.…”

Section: Introductionmentioning

confidence: 99%

Joint Resource Optimization for Orthogonal Frequency Division Multiplexing Based Cognitive Amplify and Forward Relaying Networks

Qin

Zhou

2020

Sensors

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This paper investigates two resource allocation problems in cognitive relaying networks where both secondary network and primary network coexist in the same frequency band and adopt orthogonal frequency division multiplexing (OFDM) technology. The first one is the sum rate maximization problem of a secondary network under total power budget of a secondary network and tolerable interference constraint of a primary network. The second one is the sum rate maximization problem of a secondary network under separate power budgets of a secondary network and tolerable interference constraint of a primary network. These two optimization problems are completely different from those in traditional cooperative communication due to interference management constraint condition. A joint optimization algorithm is proposed, where power allocation and subcarrier pairing are decomposed into two subproblems with reasonable cost. The first one is a closed form solution of power allocation of the secondary network while managing the interference to a primary network under a constraint condition. The other is optimal subcarrier pairing at given power allocation. Simulation results reveal aspects of average signal to noise ratio (SNR), interference level, relay position, and power ratio on the sum rate of a secondary network.

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Performance Analysis of Amplify-and-Forward Multiple-Relay MIMO Systems With ZF Reception

Cited by 15 publications

References 32 publications

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

An Adaptive Self-Interference Cancelation/Utilization and ICA-Assisted Semi-Blind Full-Duplex Relay System for LLHR IoT

An Amplify-and-Forward Scheme for Spectrum Sharing in Cognitive Radio Channels

Joint Resource Optimization for Orthogonal Frequency Division Multiplexing Based Cognitive Amplify and Forward Relaying Networks

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