New joint frame synchronisation and carrier frequency offset estimation method for OFDM systems

Abstract

SUMMARYWe propose a new joint frame synchronisation and carrier frequency offset estimation scheme for burst transmission mode OFDM systems. This scheme uses a central-symmetric and comb-like (CSCL) training sequence, which eases the power detection at the receiver without increasing the total training sequence power. Fine frame synchronisation as well as carrier frequency offset acquisition with a maximum acquisition range of ± N 4×SF times the sub-carrier spacing can also be performed based on the proposed CSCL training sequence, where N is the discrete Fourier transform (DFT) length and SF is an integer-valued spreading factor used to generate CSCL. The post-acquisition residual carrier frequency offset can be further estimated and corrected via a fine adjustment algorithm. In order to reduce performance loss due to the high peakto-average power ratio (PAPR) of the CSCL training sequence, a time-domain constant-envelope (CE) training sequence is also proposed. The superior estimation accuracy of the proposed algorithm over that of the Moose algorithm and the SS (Shi and Serpedin) algorithm is proved by computer simulation.

Replica Correlation-Based Synchronization with Low Complexity and Frequency Offset Immunity

“…In general, if there is no FO, then the DV in (14), as a function of STO, will peak when the offset is zero (that is, θ=0).…”

“…Progressive studies related to the LTE-compliant STS signal were conducted in [12]- [14], which means that they focused on proposing the effective detecting schemes to acquire the STS at an MS. Progressive studies related to the LTE-compliant STS signal were conducted in [12]- [14], which means that they focused on proposing the effective detecting schemes to acquire the STS at an MS.…”

“…In [12], an optimized RC-based detection scheme for computing frequency-domain (FD) Zadoff-Chu (ZC) sequence elements was proposed. In [14], the STS detection scheme based on RC and central self-correlation using the central-symmetric property (CSP) in ZC sequences was studied to reduce the detector complexity. In [14], the STS detection scheme based on RC and central self-correlation using the central-symmetric property (CSP) in ZC sequences was studied to reduce the detector complexity.…”

“…In [14], the STS detection scheme based on RC and central self-correlation using the central-symmetric property (CSP) in ZC sequences was studied to reduce the detector complexity. On the other hand, there was no attention to the PAPR reduction in [6] and [12]- [14]. However, they made no reduction of computational detector complexity over LTE.…”

“…The authors in [6] specified a modified LTE (MLTE) STS signal that lowers the DER under a high FO in an RC-based scheme. To resolve the shortcomings in [6], to reduce the inherent PAPR, and to offer immunity against the FO, this paper concentrates on proposing an STS signal that aligns with the work presented in [12] through [14] for the pursuit of further complexity reduction and accuracy through effective detection. On the other hand, there was no attention to the PAPR reduction in [6] and [12]- [14].…”