An adaptive transmission protocol for exploiting diversity and multiplexing gains in wireless relaying networks

Astal, Mohammed Taha O. El; Abu‐Hudrouss, Ammar M.; Salmon, B.P.; Olivier, J.C.

doi:10.1186/s13638-015-0266-9

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…It is the only full rate orthogonal STBC discussed in [22]. In Alamouti scheme two symbols 1 S and 2 S are transmitted simultaneously by the antennas at instant t and t + T according to Table 1; where T is the duration of a symbol as discussed in [23].…”

Section: Alamouti Schemementioning

confidence: 99%

Recovery of Image through Alamouti Channel with Incorporation of RSA Algorithm

Majumder¹,

Ruhin²,

Hashem³

et al. 2016

JCC

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In many applications, it is necessary to transmit images at a remote station, where wired Internet service is not available. In this case, wireless local loop (WLL) can help in making wireless link between one end node of the internet and remote service center. In such link, the communication is heavily affected by large and small scale fading; hence the received signal experiences huge distortion in case of forward error correction. Otherwise, huge service delay arises due to frequent negative acknowledgements. To combat the situation, we can choose Alamouti channel of full rate and fully orthogonal space-time block code (OSTBC). Our aim is to transmit images through Alamouti channel and to observe the quality of the recovered image, in context of bit error rate (BER). We have also observed the impact of fading and additive white Gaussian noise (AWGN) on the image without application of error correction or detection technique of channel coding. To ensure security, we apply the RSA algorithm on each pixel prior transmitting and decrypt them at the receiving end, where we found no impairment from the algorithm. Finally, we observe that the relative performance of the system changes digital modulation schemes.

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Section: Alamouti Schemementioning

confidence: 99%

Recovery of Image through Alamouti Channel with Incorporation of RSA Algorithm

Majumder¹,

Ruhin²,

Hashem³

et al. 2016

JCC

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show abstract

“…In the conventional one-way cooperative relaying protocols operating in the half-duplex mode, the source broadcasts the data to the relay and the destination in the first time slot, and then the relay repeats it to the destination using its own subchannel in the next time slot [14]. This repetition-based relaying approach reduces the overall system spectral efficiency and limits the achievable data rate [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Two-way decode-and-forward cooperative systems with signal space diversity

Khan

Rao

Wang

2016

J Wireless Com Network

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In this paper, a novel scheme is proposed to enhance the spectral efficiency of a two-way cooperative relaying system, where two source terminals exchange information directly and via K intermediate relays using the three-phase two-way decode-and-forward (DF) protocol. Signal space diversity (SSD) is incorporated into the two-way cooperative relaying system in the proposed scheme that exploits the inherent diversity in the modulation signal space by rotating and expanding the ordinary constellation. The proposed SSD-based three-phase two-way DF relaying scheme exchanges four symbols in three time slots and thus doubles the spectral efficiency as compared to the conventional three-phase two-way DF relaying system, where six time slots are required to exchange the same four symbols. This improvement in spectral efficiency is achieved without adding any extra complexity, bandwidth, or transmit power. A comprehensive analysis of the proposed scheme is carried out in this paper, and closed-form expressions for various performance metrics, including error probability, outage probability, and channel capacity, are derived. It is shown that the proposed scheme provides a diversity gain equal to one higher than the number of relays. The paper also studies different schemes for the optimization of relay position and power allocation. Finally, Monte Carlo simulations are performed which confirm the validity and accuracy of the analytical framework.

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