Performance of a two-hop cellular system with different power allocation schemes

In future wireless communication systems, an architecture introducing wireless relaying technologies into the cellular infrastructure seems a promising approach to enlarge the coverage area and enhance the system capacity. The paper describes a two-hop cellular system, based on time division multiple access (TDMA), incorporated with a nonregenerative relaying station (NRRS), or a regenerative relaying station (RRS), where the RS works in time division duplex (TDD) mode. A general analysis of the system performance is provided in a multi-cell environment, where two power allocation schemes, optimal power allocation (OPA) and uniform power allocation (UPA), between the base station (BS) and the RS, are compared. Simulation results show that, compared with the single-hop system, the relaying system not only can obtain diversity gain and improve the performance, but also, with the OPA scheme and the proper arrangement of RSs, the performance gains can be further improved.