Diversity Analysis of Hierarchical Modulation in Wireless Relay Networks

2014-07-01
Yalcyn, Ahmet Zahid
Yüksel Turgut, Ayşe Melda
In communication systems, hierarchical modulation is used to increase system robustness and to send different information flows simultaneously. However, when used in cooperative communication systems, hierarchical modulation is prone to error propagation, which is the most important problem that prevents the achievement of full diversity gains. Depending on the signal-to-noise ratio between the source and the relay, threshold digital relaying can be used to mitigate error propagation. Mitigating error propagation and achieving full diversity depend on setting the thresholds at the relay properly. In this paper, the first and second threshold values are determined so that full diversity gains are attained for both base and enhancement layer bits. Analytical and simulation results are provided to show that the threshold values must depend on the hierarchy parameter.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY

Suggestions

Diversity Analysis of Hierarchical Modulation in Cooperative Communication
Yalcin, Ahmet Zahid; Yüksel Turgut, Ayşe Melda (2014-01-01)
In cooperative communication systems, hierarchical modulation is used to increase systems robustness and to send different information flows simultaneously. In cooperative communication systems which use hierarchical modulation, error propagation is the most important problem that prevents achieving full diversity gain. Thresholds that depend on the signal to noise ratio (SNR) value between the source and the relay can be used to mitigate error propagation. If the instantaneous SNR between the source and th...
Adaptive modulation for completion time minimization in wireless broadcast networks
Yüksel Turgut, Ayşe Melda; Genc, Yasin (2017-01-01)
In this work we study the effect of hierarchical modulation on completion time minimization in wireless broadcast channels. Time needed to transmit all bits intended for a particular user is defined as its completion time. In this work we investigate minimizing the maximum completion time over all users in a broadcast channel using hierarchical modulation. We compare time division, opportunistic scheduling, and three different adaptive modulation schemes: rate adaptive hierarchical modulation assisted trans...
Implementation and evaluation of a synchronous time-slotted medium access protocol for networked industrial embedded systems
Gözcü, Ahmet Korhan; Schmidt, Şenan Ece; Department of Electrical and Electronics Engineering (2011)
Dynamic Distributed Dependable Real-time Industrial communication Protocol family (D3RIP), has been proposed in the literature considering the periodic or event-based traffic characteristics of the industrial communication networks. D3RIP framework consists of two protocol families: Interface Layer (IL) protocol family, which is responsible for providing the accurate time-division multiple access (TDMA) on top of a shared-medium broadcast channel, and Coordination Layer (CL), which is defined to fulfill the...
MIMO Communication Systems Using Hierarchical Modulation
Ugur, Yigit; Yılmaz, Ali Özgür (2014-04-25)
This paper considers multiple-input multiple-output (MIMO) communication systems using hierarchical modulation. The disadvantage of the maximum-likelihood (ML) receiver is that the computational complexity increases exponentially with the number of transmit antennas and the number of bits per modulation symbol. Using MIMO communication system with 16-ary hierarchical quadrature amplitude modulation (16-HQAM), we propose a receiver structure which can be an alternative to maximum-likelihood (ML) receiver. 16...
Evaluation of priority dependent and time scheduled MAC layer protocols for ad-hoc networks
Erdeğer, İsmail; Baykal, Buyurman; Department of Electrical and Electronics Engineering (2015)
Ad-hoc networks have very unique features, such as dynamic topologies, relatively limited bandwidth and wireless signal propagation schemes, which present various challenges for wireless communication. In this thesis, control mechanisms for channel access scheduling and topology in ad-hoc networks are evaluated, which utilize the information from two-hop neighborhood to cope with the communication difficulties in ad-hoc networks. Channel assignment is one of the most important topics for ad-hoc networks. Ch...
Citation Formats
A. Z. Yalcyn and A. M. Yüksel Turgut, “Diversity Analysis of Hierarchical Modulation in Wireless Relay Networks,” IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, vol. 63, no. 6, pp. 2989–2994, 2014, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/96563.