Frequency domain pilot multiplexing technique for channel estimation of SC-FDE

Novel signal reconstruction method for SC-FDE systems with frequency domain pilot multiplexing technique over time-varying channels

“…The receive SNR is defined as E b /σ 2 v , where E b denotes the energy per bit. The main parameters of the simulations are chosen as follows: each transmitted block consists of N = 512 subcarriers with 3.125% pilot overhead ratio (N p = 16), and a length-12 CP; two PPS methods available in the literature [7], [14] are applied at the transmitter; the PPD method proposed in [13] is applied in consideration of its robustness and low complexity; the Chu sequence [20] is used as the pilots and the trigonometric interpolation is adopted to estimate the CFRs [21]; the ZF equalization is considered. Fig.…”

“…The transmitter structure of the SC-FDE system with the FDPMT [7], [8] is depicted in Fig. 1 Fourier transform (DFT):…”

“…After the CP is removed at the receiver, an N -point DFT is employed to obtain the received block {r F (k)} N −1 k=0 in the frequency domain. Then, the PPD schemes proposed in [7], [8], [12], [13] can be applied to detect the initial pilot position, outputting the initial position estimate asb 0 . For ease of exposition, we have made the assumption of perfect PPD, i.e.,b 0 = b 0 , albeit practical PPD will be considered in the simulations.…”

“…Compared with the time domain multiplexed (TDM) pilot insertion technique, the frequency domain multiplexed (FDM) one is more effective in tracking the doubly-selective fading channel [1], [4], [5]. There are three FDM pilot insertion techniques available in the literature, including the frequency expanding technique (FET), the frequency domain superimposed pilot technique (FDSPT), and the FDPMT [5]- [7]. Compared with the other two techniques, the FDMPT attracts much more attention owing to its capability of recovering the loss of spectral efficiency which happens in the FET and avoiding the degradation of BER performance which happens in the FDSPT [5].…”

“…Since the receiver is blind to the varying pilot positions, pilot position detection (PPD) is indispensable. So far, many effective PPS and PPD methods have been proposed [7]- [15], which are able to confine the distortion to a relatively low level and achieve high PPD accuracy. With the guarantee of low distortion level and high PPD accuracy, the performance of the FDPMT over the timevarying channel will be mainly determined by the SR ability of the receiver.…”