Channel Capacity of Parallel Relaying 2-Hop OFDMA Virtual Cellular Network

In the next generation mobile communication systems, high speed data services are expected. However, an unacceptably high transmit power is required. Multi-hop technique can solve this problem. In this paper, we propose a parallel relaying scheme using orthogonal frequency division multiple access (OFDMA), in which the multiple parallel logical routes (one subcarrier is allocated to each link of a logical route) are constructed between a mobile terminal and a base station. Collective construction method, which examines all possible logical routes defined by a physical route and subcarriers to each link along the physical route and selects the best logical route having the maximum channel capacity, requires a prohibitively high complexity. Therefore, we propose a successive construction method. We evaluate the channel capacity of the proposed parallel relaying scheme and compare it with cooperative diversity scheme and also with the conventional single hop network. Keywords-component; Virtual cellular network, Subcarrier allocation, Route construction, Parallel relaying, Cooperative diversity, Channel capacity, OFDMA

[1]  Fumiyuki Adachi,et al.  Power and Frequency Efficient Wireless Multi-Hop Virtual Cellular Concept , 2005, IEICE Trans. Commun..

[2]  Xiaodong Wang,et al.  Optimal resource allocation in multi-hop OFDMA wireless networks with cooperative relay , 2008, IEEE Transactions on Wireless Communications.

[3]  Aria Nosratinia,et al.  Cooperative communication in wireless networks , 2004, IEEE Communications Magazine.

[4]  John M. Cioffi,et al.  Resource-Allocation for OFDMA Multi-Hop Relaying Downlink Systems , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[5]  Yasushi Yamao,et al.  Multi-Hop Wireless Link System for New Generation Mobile Radio Access Networks , 2002 .

[6]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.

[7]  Helmut Bölcskei,et al.  Fading relay channels: performance limits and space-time signal design , 2004, IEEE Journal on Selected Areas in Communications.

[8]  Gerhard Fettweis,et al.  Relay-based deployment concepts for wireless and mobile broadband radio , 2004, IEEE Communications Magazine.

[9]  Fumiyuki Adachi,et al.  Distributed Dynamic Channel Assignment for Multi-Hop DS-CDMA Virtual Cellular Network , 2005, IEICE Trans. Commun..

[10]  J.E. Mazo,et al.  Digital communications , 1985, Proceedings of the IEEE.

[11]  H. Murata,et al.  Space time coded cooperative relaying technique for multihop communications , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.