A novel pilot mapping method for channel-quality estimation in SC-FDMA system

In this paper, we introduce a novel pilot mapping method for channel-quality (CQ) estimation of each user in single carrier-frequency division multiple access (SC-FDMA) system. In case of conventional code division multiplexing (CDM) method, it enables measurement of CQ levels over all sub-carriers. The method, however, has a limit on estimating the accurate channel frequency response for coherent demodulation in contrast with frequency division multiplexing (FDM) based on localized mapping. In order to overcome the structural problem, we combine two characteristic methods, CDM and FDM, and estimate the channel values depending on the purpose. Simulation results show that the proposed method can improve the demodulation performance with a similar CQ error rate compared with the conventional method.