Characterization of effective capacity in AF relay systems

Lari, Mohammad; Mohammadi, Abbas; Abdipour, Abdolali; Lee, Inkyu

doi:10.1587/elex.9.679

Cited by 8 publications

(7 citation statements)

References 3 publications

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“…Using the Lagrangian optimization method [40], the problem can be solved and µ opt 0 is derived. However, applying the Lagrange method in the optimization problem of (10), a high non-linear equation of µ opt 0 is obtained and extraction of a closed-form solution for µ opt 0 is not possible [30]. Therefore, we continue with a novel approximation and replace µ 0 at the denominator of (10) by its average E{µ 0 } = 1.…”

Section: Power Allocation Strategymentioning

confidence: 99%

“…Here, we study the power allocation of AF successive relays for effective capacity maximization. The effective capacity is more general than the ergodic capacity which is defined as a maximum constant arrival rate with the delay quality-of-service (QoS) guarantee [30]- [33]. Then, the allocated power is derived under short-term and long-term IRI constraints and compared with different allocation techniques with different QoS requirements.…”

Section: Introductionmentioning

confidence: 99%

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Power allocation and effective capacity of AF successive relays

Lari

2016

Wireless Netw

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In the relay based telecommunications with K relays between the source and destination, K + 1 time or frequency slots are required for a single frame transmission. However, without the relays, only one time or frequency slot is used for a single frame transmission. Therefore, despite the benefits of relaying systems, this type of communications is not efficient from the spectral efficiency viewpoint. One solution to reduce this issue might be the full-duplex (FD) relays. An old technique which is reconsidered recently to improve the spectral efficiency of telecommunication systems. However, FD relays have a certain complexity, so, some similar techniques such as successive relays with nearly the same performance but less complexity is taken into account now. In successive relaying systems, two relays between the source and destination are employed which receive the transmitted frames from the source and relay it to the destination successively. This structure generally acts like an FD relays.In this paper, the effective capacity performance of an amplify and forward (AF) successive relaying systems with power allocation strategy at the relays are studied perfectly. However, while the inter-rely interference (IRI) between two successive relays has to be managed well, the power allocation and the effective capacity is derived under different assumptions about the IRI. In this way, we assume weak or strong, short or long-term constraints on the IRI.Then we extract the optimal transmitted power at the relay to maximize the effective capacity under these constraints.

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Section: Power Allocation Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power allocation and effective capacity of AF successive relays

Lari

2016

Wireless Netw

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“…In our case, c (m) q is directly calculated with discrete convolution. c (0) = 1, and c (1) can be defined as…”

Section: A Receive Antenna Selectionmentioning

confidence: 99%

Characterization of effective capacity in antenna selection MIMO systems

et al. 2013

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In this paper, the effective capacity of a multiple-input multiple-output (MIMO) system in two different cases with receive antenna selection (RAS) and transmit antenna selection (TAS) schemes is investigated. A closed-form solution for the maximum constant arrival rate of this network with statistical delay quality of service (QoS) constraint is extracted in the quasi-static fading channel. This study is conducted in two different cases. When channel state information (CSI) is not available at the MIMO transmitter, implementation of TAS is difficult. Therefore, RAS scheme is employed and one antenna with the maximum instantaneous signal to noise ratio is chosen at the receiver. On the other hand, when CSI is available at the transmitter, TAS scheme is executed. In this case, one antenna is selected at the transmitter. Moreover, an optimal power-control policy is applied to the selected antenna and the effective capacity of the MIMO system is derived. Finally, this optimal power adaptation and the effective capacity are investigated in two asymptotic cases with the loose and strict QoS requirements. In particular, we show that in the TAS scheme with the loose QoS restriction, the effective capacity converges to the ergodic capacity. Then, an exact closed-form solution is obtained for the ergodic capacity of the channel here.

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“…The authors assume a Gaussian distribution for the accumulated service rate of the channel, which leads to a solution for the effective capacity of the channels. Following these basic researches, the effective capacity has been conducted in various communication links such as rate and power adoption in single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems [5]- [6], antenna selection (AS) MIMO systems [7]- [8] and cooperative and cognitive radio channels in [9]- [10].…”

Section: Introductionmentioning

confidence: 99%

Effective capacity of receive antenna selection MIMO–OSTBC systems in co-channel interference

Lari

2016

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In this paper, delay constrained performance of a multiple-input multiple-output (MIMO) communication system in a dense environment with co-channel interference is investigated. We apply orthogonal space-time block coding (OSTBC) at the transmitter, and for alleviating the high complexity and cost of the MIMO system, receive antenna selection (RAS) scheme is employed in the downlink. Here, for simple and cheap mobile handsets, one antenna is chosen at the receiver in each utilization of the channel. Under these assumptions, a maximum constant arrival rate with the delay qualityof-service (QoS) guarantee in a wireless channel is extracted. We obtain a closed-form solution for the effective capacity of the MIMO-OSTBC channel with the RAS scheme in a quasi-static Rayleigh fading conditions and cochannel interference. After all, the numerical simulations are provided and verified the theoretical results.

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Characterization of effective capacity in AF relay systems

Abstract: Abstract:In this paper, effective capacity in amplify-and-forward (AF) relaying system is studied. For this purpose, a closed-form solution for the effective capacity of AF relays with a near optimal power allocation is extracted.

Cited by 8 publications

References 3 publications

Power allocation and effective capacity of AF successive relays

Power allocation and effective capacity of AF successive relays

Characterization of effective capacity in antenna selection MIMO systems

Effective capacity of receive antenna selection MIMO–OSTBC systems in co-channel interference

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