Now showing items 1-8 of 8

  • A Reliable Successive Relaying Protocol 

    Successive relaying has recently emerged as an effective technique for cooperative networks and provides significant improvements in bandwidth efficiency over traditional relaying techniques ;however to achieve full-diversity the available successive relaying protocols generally assume noise-free sourcerelay and interference-free inter-relay channels. In this paper a novel successive relaying protocol is proposed for N-relay wireless networks by removing these optimistic assumptions. The proposed ...

  • Optical Spatial Modulation OFDM System Design 

    Authors:Cihan, Salih Bilge; Başar, Ertuğrul; Panayırcı, Erdal
    Publisher and Date:(IEEE, 2016)
    In this paper a new optical orthogonal frequency division multiplexing (OFDM) method is proposed for multiple-input multiple-output (MIMO) visible light communications (VLC) systems. In the new scheme non-DC biased optical OFDM (NDC-OFDM) and optical spatial modulation (OSM) methods are combined to obtain a novel optical OFDM scheme which has a better error performance. The new scheme is named as non-DC biased optical spatial modulation OFDM (NDC-OSM-OFDM). It is shown via computer simulations ...

  • Orthogonal Frequency Division Multiplexing With Index Modulation 

    In this paper a novel orthogonal frequency division multiplexing (OFDM) scheme called OFDM with index modulation (OFDM-IM) is proposed for operation over frequency-selective and rapidly time-varying fading channels. In this scheme the information is conveyed not only by M-ary signal constellations as in classical OFDM but also by the indices of the subcarriers which are activated according to the incoming bit stream. Different low complexity transceiver structures based on maximum likelihood ...

  • Performance of MIMO Enhanced Unipolar OFDM with Realistic Indoor Visible Light Channel Models 

    Visible light communication (VLC) involves the dual use of illumination infrastructure for high speed wireless access. Designing such optical based communication systems realistic indoor optical channel modeling becomes an important issue to be handled. In this paper first we obtain new realistic indoor VL channel characterizations and models in a multiple-input multiple-output (MIMO) transmission scenario using non-sequential ray tracing approach for the channel impulse responses (CIRs). Practical ...

  • SISO - MIMO applications and analysis of visible light communications systems 

    Authors:Yeşilkaya, Anıl
    Publisher and Date:(Kadir Has University, 2016)
    Rapid development in technology and increasing necessity to reach information instantaneously saturates RF bands rapidly. Because of that, it can be seen that we are gradually approaching upper limits of the band. It can said that, operating beyond that upper limit would be hard and unfeasible for 5th generation mobile systems (5G). At this point, it is needed to develop alternative telecommunication systems to RF technology. VLC could be the most appropriate and appealing solution for researchers ...

  • Space-Time Block Coded Spatial Modulation 

    A novel multiple-input multiple-output (MIMO) transmission scheme called space-time block coded spatial modulation (STBC-SM) is proposed. It combines spatial modulation (SM) and space-time block coding (STBC) to take advantage of the benefits of both while avoiding their drawbacks. In the STBC-SM scheme the transmitted information symbols are expanded not only to the space and time domains but also to the spatial (antenna) domain which corresponds to the on/off status of the transmit antennas ...

  • Space-Time Block Coding for Spatial Modulation 

    Space-time block coded spatial modulation (STBC-SM) which employs space-time block coding (STBC) for spatial modulation (SM) is proposed as a new multiple-input multiple-output (MIMO) transmission scheme. In the STBC-SM scheme the transmitted information symbols are expanded not only to the space and time domains but also to the spatial (antenna) domain therefore both core STBC and antenna indices carry information. A general framework is presented for the design of the STBC-SM scheme for any ...

  • Trellis Code Design for Spatial Modulation 

    Authors:Başar, Ertuğrul; Aygölü, Ümit; Panayırcı, Erdal
    Publisher and Date:(IEEE, 2011)
    In this paper we propose a novel multiple-input multiple-output (MIMO) transmission scheme called trellis coded spatial modulation (TC-SM) in which a trellis (convolutional) encoder and a spatial modulation (SM) mapper are jointly designed similar to the conventional trellis coded modulation (TCM). A soft decision Viterbi decoder which is fed with the soft information supplied by the optimal SM decoder is used at the receiver. The pairwise error probability (PEP) upper bound is derived for the ...