Abstract
This paper proposes interference-based decode and forward scheme that utilizes relay stations (RSs). In Long-Term-Evolution (LTE-) Advanced, heterogeneous networks in which femto- and picocells are overlaid onto macrocells are extensively discussed. However, interference between macro- and pico(femto)cells arises due to their different transmit power levels. Unlike conventional cooperative transmission schemes, the RS decodes interference in the first transmit timing period and forwards it to the user equipment (UE) in the second period. Moreover, cooperative transmission can be achieved without stopping the transmission from the base station (BS) to UE when forwarding the interference from the RS to the UE by utilizing the fact that signal-to-noise power ratio (SNR) between the RS and UE is much greater than that between the BS and UE. The basic performance of the proposed method is shown based on computer simulation. Moreover, the interference temperature and shadowing effect are measured when considering the coexistence between macro- and femtocells, and the performance of the proposed method is verified using measured shadowing effect.
Highlights
Due to the immense popularity of mobile phones and wireless LAN systems, increasing the data rate within a limited spectrum is one of the most important goals for wireless system design
This paper proposed interference-based decode and forward method using the relay stations (RSs) in heterogeneous networks
We clarified the effectiveness of the proposed method compared to using the conventional adaptive array with zero forcing (ZF) and minimum mean square error (MMSE) algorithms when the signal-tonoise power ratio (SNR) between the RS and user equipment (UE) is 8 dB greater than that between the base station (BS) and UE
Summary
Due to the immense popularity of mobile phones and wireless LAN systems, increasing the data rate within a limited spectrum is one of the most important goals for wireless system design. Macrocells, the service areas which are one to several kilometers, were introduced in conventional cellular systems. Femto- and picocells are currently the focus because small cells can enhance the frequency utilization and can be established using a low-powerconsuming base station (BS) that requires a small installation space. In Long-Term-Evolution (LTE-) Advanced, heterogeneous networks are extensively discussed in addition to traditional well-planned macrocell deployment to further improve the frequency utilization [1,2,3]. Low power nodes such as femto-, pico, and relay nodes are placed throughout a macrocell layout, and they are placed generally in an unplanned manner. Interference between macro- and pico(femto)cells occurs because the transmission power of pico(femto)cells is different from that of macrocell and the service coverage areas are different between these cells
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