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.