Interpolation based pilot-aided channel estimation for STBC spatial modulation and performance analysis under imperfect CSI


Acar Y., DOGAN H., Basar E. , Panayirci E.

IET COMMUNICATIONS, cilt.10, ss.1820-1828, 2016 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 10 Konu: 14
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1049/iet-com.2016.0151
  • Dergi Adı: IET COMMUNICATIONS
  • Sayfa Sayıları: ss.1820-1828

Özet

A combination of space-time block coding and spatial modulation (STBC-SM) has been recently proposed for multiple input-multiple output systems to obtain both spatial diversity gain and more capacity simultaneously while assuming the perfect channel state information (P-CSI) was available at the receiver. However, in practical scenarios the CSI is unknown to the receiver and should be estimated in order to detect the transmitted data in a reliable way. Therefore, channel estimation (CE) is a major challenge in designing the STBC-SM systems. In this study, the problem of CE is investigated and a new pilot-aided channel estimation (PA-CE) technique, coupled with an interpolation, is proposed for the STBC-SM systems operating in the presence of rapidly time-varying mobile channels. Several interpolation schemes such as the linear, nearest neighbour, piecewise cubic Hermite and the low-pass interpolations are applied and their performances are compared to determine the best suitable interpolation technique to be employed in STBC-SM systems. Bit error rate (BER) performance of the proposed CE technique is then investigated in time-varying channels with different modulation. Moreover, the pairwise error probability of the STBC-SM scheme is derived and its average bit error probability is evaluated analytically in the presence of CE errors.