Cooperative Transmission Protocols with High Spectral Efficiency and High Diversity Order Using Multiuser Detection and Network Coding

Cooperative transmission is an emerging communication technique that takes advantages of the broadcast nature of wireless channels. However, due to low spectral efficiency and the requirement of orthogonal channels, its potential for use in future wireless networks is limited. In this paper, by making use of multiuser detection (MUD) and network coding, cooperative transmission protocols with high spectral efficiency, diversity order, and coding gain are developed. Compared with the traditional cooperative transmission protocols with single-user detection, in which the diversity gain is only for one source user, the proposed MUD cooperative transmission protocols have the merits that the improvement of one user's link can also benefit the other users. In addition, using MUD at the relay provides an environment in which network coding can be employed. The coding gain and high diversity order can be obtained by fully utilizing the link between the relay and the destination. From the analysis and simulation results, it is seen that the proposed protocols achieve higher diversity gain, better asymptotic efficiency, and lower bit error rate, compared to traditional MUD and to existing cooperative transmission protocols.Comment: to appear, in the proceedings of IEEE International Conference on Communications, Glasgow, Scotland, 24-28 June 200

Outage Probability Analysis of Coded Cooperative Communication

Cooperative communication was proposed for wireless networks such as cellular network and wireless ad-hoc networks to meet the rapid increase in the data rate. Coded cooperative communication is one of the co-operative system, in which cooperation is combined with the channel coding. Coded cooperation is a promising technology to improve the outage performance of the system

Implementasi Dan Analisa Kinerja Sistem Komunikasi Kooperatif Decoding And Forward (DF) Dengan Skema Network Coding Menggunakan Wireless Open-Access Research Platform (WARP)

Network Coding adalah teknik dimana data yang dikirimkan akan dikodekan di relay dalam bentuk XOR dan diterjemahkan kembali. Salah satu tujuan dari Network Coding adalah peningkatan throughput. Sedangkan sistem komunikasi kooperatif merupakan komunikasi yang memanfaatkan penggunaan untuk mengeleminasi fading untuk meningkatkan kinerja sistem, skema decoding and forward pada sistem komunikasi kooperatif adalah informasi akan dikodekan terlebih dahulu sebelum dikirimkan ke tujuan. Penggunaan network coding pada sistem komunikasi kooperatif dimaksudkan untuk meingkatkan kinerja dari sistem komunikasi tersebut. Wireless Open-Access Research Platform (WARP) adalah salah satu software defined radio yang dikembangkan untuk mengimplementasikan sistem komunikasi. Pada tugas akhir ini, sistem komunikasi kooperatif yang akan digabungkan dengan teknik network coding akan disimulasikan pada Matlab dan diimplementasikan pada WARP. Dari hasil implementasi yang didapat menunjukan bahwa komunikasi network coding mempunyai kinerja yang tidak jauh berbeda bila diukur berdasarkan BER seperti pada saat diukur dengan daya pancar -20.3 dBm nilai BER untuk komunikasi kooperatif 0 dan kooperatif network coding 0.0002, namun jika diukur berdasarkan throughput kinerja komunikasi kooperatif network coding lebih baik dibandingkan kooperatif konvensional, seperti pada saat daya pancar berada pada level -17.1 dBm throughput yang dihasilkan kooperatif network coding adalah 2.6 kbps, sementara untuk kooperatif konvensional adalah 2.2 kbps. ===================================================================================== Network Coding is a technique where the data transmitted will be encoded on relay first in the form XOR and will be translated again. One of purpose of network coding is improve throughput. Whereas Cooperative Communication System is Communication that use relay for eliminate fading to improve system performance, decoding and forward scheme on Cooperative Communication System is scheme that will be encode message first before sent it to destination. The purpose of using network coding on cooperative communication system is for improving performance the system. Wireless Open-Access Research Platform (WARP) is one of software defined radio which was developed for implementing the communication system. In this final project cooperative communication which will be combined with network coding technique will be simulated on matlab and implemented on WARP. From the implementation result, performance of cooperative communication system with network coding will be analyzed. From the implementation result is showing that cooperative communication with network coding isn’t much different with conventional cooperative coomunication with BER parameters, such as when measuring with power transmit -20.3 dBm, the values of bit error rate for cooperative communication is 0 and cooperative network coding is 0.0002 , but if measuring based on throughput, performance of cooperative communication with network coding is better than conventional cooperative communication, such as when power transmit at -17.1 dBm, throughput for cooperative network coding is 2.6 kbps, and for conventional cooperative is 2.2 kbps

Distributed Linear Convolutional Space-Time Coding for Two-Relay Full-Duplex Asynchronous Cooperative Networks

In this paper, a two-relay full-duplex asynchronous cooperative network with the amplify-and-forward (AF) protocol is considered. We propose two distributed space-time coding schemes for the cases with and without cross-talks, respectively. In the first case, each relay can receive the signal sent by the other through the cross-talk link. We first study the feasibility of cross-talk cancellation in this network and show that the cross-talk interference cannot be removed well. For this reason, we design space-time codes by utilizing the cross-talk signals instead of removing them. In the other case, the self-coding is realized individually through the loop channel at each relay node and the signals from the two relay nodes form a space-time code. The achievable cooperative diversity of both cases is investigated and the conditions to achieve full cooperative diversity are presented. Simulation results verify the theoretical analysis.Comment: 11 pages, 7 figures, accepted by IEEE transactions on wireless communication

Design of Network Coding Schemes and RF Energy Transfer in Wireless Communication Networks

This thesis focuses on the design of network coding schemes and radio frequency (RF) energy transfer in wireless communication networks. During the past few years, network coding has attracted significant attention because of its capability to transmit maximum possible information in a network from multiple sources to multiple destinations via a relay. Normally, the destinations are only able to decode the information with sufficient prior knowledge. To enable the destinations to decode the information in the cases with less/no prior knowledge, a pattern of nested codes with multiple interpretations using binary convolutional codes is constructed in a multi-source multi-destination wireless relay network. Then, I reconstruct nested codes with convolutional codes and lattice codes in multi-way relay channels to improve the spectrum efficiency. Moreover, to reduce the high decoding complexity caused by the adopted convolutional codes, a network coded non-binary low-density generator matrix (LDGM) code structure is proposed for a multi-access relay system. Another focus of this thesis is on the design of RF-enabled wireless energy transfer (WET) schemes. Much attention has been attracted by RF-enabled WET technology because of its capability enabling wireless devices to harvest energy from wireless signals for their intended applications. I first configure a power beacon (PB)-assisted wireless-powered communication network (PB-WPCN), which consists of a set of hybrid access point (AP)-source pairs and a PB. Both cooperative and non-cooperative scenarios are considered, based on whether the PB is cooperative with the APs or not. Besides, I develop a new distributed power control scheme for a power splitting-based interference channel (IFC) with simultaneous wireless information and power transfer (SWIPT), where the considered IFC consists of multiple source-destination pairs

Cooperative Detection and Network Coding in Wireless Networks

In cooperative communication systems, multiple terminals in wireless networks share their antennas and resources for information exchange and processing. Recently, cooperative communications have been shown to achieve significant performance improvements in terms of transmission reliability, coverage area extension, and network throughput, with respect to existing classical communication systems. This dissertation is focused on two important applications of cooperative communications, namely: (i) cooperative distributed detection in wireless sensor networks, and (ii) many-to-many communications via cooperative space-time network coding. The first application of cooperative communications presented in this dissertation is concerned with the analysis and modeling of the deployment of cooperative relay nodes in wireless sensor networks. Particularly, in dense wireless sensor networks, sensor nodes continuously observe and collect measurements of a physical phenomenon. Such observations can be highly correlated, depending on the spatial separation between the sensor nodes as well as how the physical properties of the phenomenon are evolving over time. This unique characteristic of wireless sensor networks can be effectively exploited with cooperative communications and relays deployment such that the distributed detection performance is significantly improved as well as the energy efficiency. In particular, this dissertation studies the Amplify-and-Forward (AF) relays deployment as a function of the correlation of the observations and analyzes the achievable spatial diversity gains as compared with the classical wireless sensor networks. Moreover, it is demonstrated that the gains of cooperation can be further leveraged to alleviate bandwidth utilization inefficiencies in current sensor networks. Specifically, the deployment of cognitive AF cooperative relays to exploit empty/under-utilized time-slots and the resulting energy savings are studied, quantified and compared. The multiple terminal communication and information exchange form the second application of cooperative communications in this dissertation. Specifically, the novel concept of Space-Time-Network Coding (STNC) that is concerned with formulation of the many-to-many cooperative communications over Decode-and-Forward (DF) nodes is studied and analyzed. Moreover, the exact theoretical analysis as well as upper-bounds on the network symbol error rate performance are derived. In addition, the tradeoff between the number of communicating nodes and the timing synchronization errors is analyzed and provided as a network design guideline. With STNC, it is illustrated that cooperative diversity gains are fully exploited per node and significant performance improvements are achieved. It is concluded that the STNC scheme serves as a potential many-to-many cooperative communications scheme and that its scope goes much further beyond the generic source-relay-destination communications