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Fast and reliable channel estimation is very important for wireless communication transmission. A novel One-Cycle blind channel estimation algorithm based on cyclostationarity properties of OFDM signal is proposed in this paper. Without changing cycle frequency, the new algorithm is formed from using the two related z-transform values of delay parameter. Furthermore, a simplified algorithm based on...
The geometric sequence has been shown feasible for large carrier frequency offset (CFO) acquisition, while the modulatable orthogonal sequence (MOS) has been used to assist joint time synchronization and channel estimation in orthogonal frequency-division multiplexing (OFDM) systems. This paper first proposes a method to make an MOS partially geometric. Consequently, the partially geometric MOS can...
This paper deals with the minimum mean square error estimation (MMSEE) of spatial channel model (SCM) in the Third Generation Partnership Project (3GPP) based on orthogonal frequency division multiplexing (OFDM) system. In particular, we focus on MMSEE on the basis of maximum likelihood estimation (MLE). Since statistical information is the critical element of MMSEE, we derive the generation of coefficients...
An OFDM structure based on super-imposed pseudo-random sequences for time domain synchronization is proposed. A time synchronization method is proposed, which is exactly located in the first channel delay by periodically super-imposed sequences. The amplitude value of each channel path estimated with minimum mean square error (MMSE) can be easily deduced with help of periodical sequences. For depth...
We introduce a novel channel impulse response (CIR) estimation method to improve performance of conventional frequency-domain pilot and time-domain processing (FPTP) algorithm. In practical OFDM system with virtual subcarriers, the conventional FPTP algorithm can effectively reduce CIR estimation error caused by band-limitation effect but it has a limit on reducing the error if the first estimation...
Orthogonal Frequency Division Multiplexing has become a key element of todays wireless communication systems. However, its sensitivity to oscillator phase noise is responsible for common phase error (CPE) and inter-carrier interference (ICI) which greatly degrades the overall system performance. In this contribution, we address the problem of reducing the effects of phase noise in an OFDM system operating...
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