PIC detector with coded distributed closed-loop EO-STBC under imperfect synchronization

This paper deals with asynchronous cooperative relay network utilizing coded distributed closed-loop extended orthogonal space time block coding (CL EO-STBC) at the relay nodes to achieve full cooperative diversity and unity data transmission rate between the relay nodes and the destination node with coding gain and linear decoding complexity for the cases of four relay nodes. Parallel interference cancellation (PIC) detection is applied at the destination node to combat intersymbol interference (ISI) generated for the asynchronous among the relay nodes. Furthermore, pairwise error probability (PEP) analysis is used to confirm the available cooperative diversity. End-to-end bit error rate (BER) simulations with and without outer coding are utilized to confirm the efficacy of the scheme. © 2012 University of Split

PIC detector with coded distributed closed-loop EO-STBC under imperfect synchronization

This paper deals with asynchronous cooperative relay network utilizing coded distributed closed-loop extended orthogonal space time block coding (CL EO-STBC) at the relay nodes to achieve full cooperative diversity and unity data transmission rate between the relay nodes and the destination node with coding gain and linear decoding complexity for the cases of four relay nodes. Parallel interference cancellation (PIC) detection is applied at the destination node to combat intersymbol interference (ISI) generated for the asynchronous among the relay nodes. Furthermore, pairwise error probability (PEP) analysis is used to confirm the available cooperative diversity. End-to-end bit error rate (BER) simulations with and without outer coding are utilized to confirm the efficacy of the scheme. © 2012 University of Split

Distributed space time block coding in asynchronous cooperative relay networks

The design and analysis of various distributed space time block coding schemes for asynchronous cooperative relay networks is considered in this thesis. Rayleigh frequency flat fading channels are assumed to model the links in the networks, and interference suppression techniques together with an orthogonal frequency division multiplexing type transmission approach are employed to mitigate the synchronization errors at the destination node induced by the different delays through the relay nodes. Closed-loop space time block coding is first considered in the context of decode-and-forward (regenerative) networks. In particular, quasi orthogonal and extended orthogonal coding techniques are employed for transmission from four relay nodes and parallel interference cancellation detection is exploited to mitigate synchronization errors. Availability of a direct link between the source and destination nodes is studied, and a new Alamouti space time block coding technique with parallel interference cancellation detection which does not require such a direct link connection and employs two relay nodes is proposed. Outer coding is then added to gain further improvement in end-to-end performance and amplify-and-forward (non regenerative) type networks together with distributed space time coding are considered to reduce relay node complexity. Novel detection schemes are then proposed for decode-and-forward networks with closed-loop extended orthogonal coding which reduce the computational complexity of the parallel interference cancellation. Both sub-optimum and near-optimum detectors are presented for relay nodes with single or dual antennas. End-to-end bit error rate simulations confirm the potential of the approaches and their ability to mitigate synchronization errors. A relay selection approach is also formulated which maximizes spatial diversity gain and attains robustness to timing errors. Finally, a new closed-loop distributed extended orthogonal space time block coding solution for amplify-and-forward type networks which minimizes the number of feedback bits by using a cyclic rotation phase is presented. This approach utilizes an orthogonal frequency division multiplexing type transmission structure with a cyclic prefix to mitigate synchronization errors. End-to-end bit error performance evaluations verify the efficacy of the scheme and its success in overcoming synchronization errors

Distributed space time block coding and application in cooperative cognitive relay networks

The design and analysis of various distributed space time block coding schemes for cooperative relay networks is considered in this thesis. Rayleigh frequency flat and selective fading channels are assumed to model the links in the networks, and interference suppression techniques together with an orthogonal frequency division multiplexing (OFDM) type transmission approach are employed to mitigate synchronization errors at the destination node induced by the different delays through the relay nodes. Closed-loop space time block coding is first considered in the context of decode-and-forward (regenerative) networks. In particular, quasi orthogonal and extended orthogonal coding techniques are employed for transmission from four relay nodes and parallel interference cancellation detection is exploited to mitigate synchronization errors. Availability of a direct link between the source and destination nodes is studied. Outer coding is then added to gain further improvement in end-to-end performance and amplify-and-forward (non regenerative) type networks together with distributed space time coding are considered to reduce relay node complexity. A novel detection scheme is then proposed for decode-and-forward and amplify-and-forward networks with closed-loop extended orthogonal coding and closed-loop quasi-orthogonal coding which reduce the computational complexity of the parallel interference cancellation. The near-optimum detector is presented for relay nodes with single or dual antennas. End-to-end bit error rate simulations confirm the potential of the approach and its ability to mitigate synchronization errors