Block Pilot Based Channel Estimation and High- Accuracy Signal Detection for GSM-OFDM Systems on High-Speed Railways

Abstract

Block pilot based channel estimation and high-accuracy signal detection for GSM-OFDM systems on high-speed railways

Improved Atomic Norm Based Channel Estimation for Time-Varying Narrowband Leaked Channels

“…In this section, we evaluate the performance of our proposed scheme. The channel model is as in Equation (2). Specifically, the delays are uniform random variables, normalized to (0, 1] and the normalized Doppler shifts (also uniform random variables) have a support [− 1 2 , 1 2 ].…”

“…Hence, 1 For Gaussian and rectangular pulse shapes with practical constraints, we also can ensure the uniqueness of the delay estimates by properly setting m i and a larger value of m 2 − m 1 is preferred to reduce the mean-squared-error of delay estimates, which is not presented in this paper due to lack of space. 2 If we have p (m 1 Ts − t k ) = 0 and p (m 2 Ts − t k ) = 0, the delay estimate of the kth path can be directly obtained. 3 Note that, the constraint…”

“…Many wireless communication applications necessitate high performance channel estimation in order to ensure reliable communications. In particular, frequency and temporal distortion [1] is a challenge in high mobility scenarios, such as high-speed railway system [2], vehicle-to-vehicle communications [3], and positioning systems [4].…”

Generalized Approximate Message Passing Detector for GSM-OTFS Systems

“…As a promising transmission scheme, GSM-OFDM combines the advantages of SM-OFDM and MIMO-OFDM, achieving a balanced trade-off between the high spectral efficiency and low IAI [20]. More specifically, we assume that the GSM-OFDM system consists of N t transmit antennas, N r receive antennas, M subcarriers and N slots, as portrayed in Fig.…”

“…Different from traditional SM, GSM activated several antennas instead of one antenna, achieving a moderate spectral efficiency and reduced IAI. Moreover, the effeteness of the combination of GSM and traditional OFDM has been confirmed in the literature [20]. However, to the best of authors' knowledge, GSM has not been applied to OTFS and its performance has not yet to be studied.…”