Cascaded orthogonal space–time block codes for wireless multi-hop relay networks

Vaze, Rahul; Heath, Robert W.

doi:10.1186/1687-1499-2013-113

Cited by 8 publications

(1 citation statement)

References 35 publications

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“…RAC is introduced to cellular systems to improve the performance of cell-edge users and is recommended in modern wireless standards e.g. 3GPP LTEAdvanced [7]. In DSFBC multiple transmission nodes are used together in a distributed way to transmit a Space Frequency Block Codes (SFBC) to the cell-edge user, this redundancy in space and frequency increases the reliability of the communication in OFDM systems by increasing the diversity gain.…”

Section: Introductionmentioning

confidence: 99%

Low complexityadaptive detection of distributed SFBC in open-loop CoMP

El-Banna

Elsabrouty

Abdelrhman

et al. 2014

2014 IEEE Symposium on Computers and Communications (ISCC)

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Coordinated multipoint (CoMP) is one technique that can be used to extend the coverage area by solving the Inter Cell Interference (ICI) problem occurring at the cell-edge. On the other hand, Distributed Space-Time/Frequency Block Coding (DSTBC/DSFBC) technique is used to improve the reliability in large modern wireless networks e.g. 3GPP LTE advanced. The cell-edge user is usually power limited. Hence, reducing processing load in such a terminal is preferable. In this paper, we propose a low complexity decoding method named Adaptive KBest Sphere Decoder (AKBSD) to serve a high mobility cell edge user facing different varying frequency selective channels from multiple base stations. AKBSD adapts the number of K-paths the decoder processes while performing the tree search depending on the estimated received signal strengths and the channel quality of each transmission link in a DSFBC open-loop CoMP environment. The simulation results confirm a good trade-off between performance and complexity achieved by AKBSD under this scenario where about 20% reduction in complexity is achieved over a high K-value fixed KBSD for the price of 0.4 dB reduction in performance at BER value of 10 -4 .

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Section: Introductionmentioning

confidence: 99%

Low complexityadaptive detection of distributed SFBC in open-loop CoMP

El-Banna

Elsabrouty

Abdelrhman

et al. 2014

2014 IEEE Symposium on Computers and Communications (ISCC)

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Design of Multihop Communication Systems Under Hardware Manufacturing Defects and Self Interference

et al. 2022

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Most studies on multi-hop communication systems are actually based on the assumption that hardware parts are built with high quality transmit/receive radio frequency chains, which are expensive and power-hungry. In practice, low cost hardware components are employed, which are prone to hardware manufacturing defects (e.g., phase noise, nonlinear power amplifier, inphase/quadrature imbalance, nonlinear low noise amplifier and analog to digital converter impairments). This paper focuses on the design of the transmitter, relay stations (RSs) and receiver for multi-hop communication systems under hardware defects. This paper analyzes the hardware defects and their impacts o n the performance of multi-hop communication system. In addition, the impact of self-interference at the RSs is considered. The effect of hardware defects is modeled using distortion noises. A closed-form expression for the signal to noise and distortion ratios (SNDRs) is mathematically derived, then the performance metrics (i.e., SNDR, outage probability (OP) and ergodic capacity) are calculated, accounting for hardware defects. In addition, exact form expression of the average bit error probability is derived. To facilitate comparison, performance metrics of the proposed multi-hop relaying system and ideal system are illustrated. We also propose a linear minimum mean square error (LMMSE) and self-interference cancellation technique to mitigate the hardware defects. The results reveal that hardware defects can degrade the system performance. In addition, SNDR ceiling is inversely proportional to the summation of the square of hardware defect lev el. Also, the proposed mitigation technique can enhance the syst em performance.INDEX TERM Multi-hop system, hardware defects, self-interference, outage, ergodic capacity, bit error probability. I. INTRODUCTION A. BackgroundTransmission-based multi-hop is a promising scheme to obtain wider coverage and to overcome wireless channels impairment. The main goal is that communication is verified via relaying the data from the transmitter to the receiver through many intermediate relays in between. Multi-hop communication systems have a number of features over classical communication systems in the fields of capacity, deployment, and connectivity, enhanced coverage, throughput, and power/battery life while decreasing the demand for specific infrastructureRelaying schemes enable network connectivity where classical architectures are difficult to implement because of constraints of the location, and can also be implemented to wireless local area networks, cellular networks , and hybrid networks. In multi-hop systems, the transmitter can communicate with the receiver via a number of relay stations (RSs). Therefore, multi-hop systems have the property of extending the coverage without applying higher transmission power.

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The performance analysis of multiuser WCDMA systems using D-STBC in Rayleigh fading channel

Muayyadi

Budiman

Astuti

2014

16th International Conference on Advanced Communication Technology

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Abstract-The development of wireless communication systems is focusing to provide a link with a high capacity and good quality. The multi-hop communication system using relay's diversity with a reliable coding is designed to fulfil the above requirements. Using multi-user WCDMA system, this research applies the above multi-hop technique using a relay with Alamouti code which can be defined as Distributed-Space Time Block Code or D-STBC. Therefore it does not need multi antenna but act like MIMO and that is why it is also called virtual MIMO using a cooperative multi-hop system. The simulation results show that the 2x1 virtual MIMO multi hop system performs better than a single hop system. Targeting BER of 10 -3 , the multi hop system give 12 dB gain compared with a single hop system.

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Cascaded orthogonal space–time block codes for wireless multi-hop relay networks

Cited by 8 publications

References 35 publications

Low complexityadaptive detection of distributed SFBC in open-loop CoMP

Low complexityadaptive detection of distributed SFBC in open-loop CoMP

Design of Multihop Communication Systems Under Hardware Manufacturing Defects and Self Interference

The performance analysis of multiuser WCDMA systems using D-STBC in Rayleigh fading channel

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