PSD-based Doppler Estimation for TDD Systems
نویسندگان
چکیده
We present a new Doppler estimation for time division duplex (TDD) systems using power spectral density (PSD) based method. First, a detailed analysis of the effect of TDD frame structure is proposed. Based on the results of analysis, we proposed a method of getting the best detection of Doppler spread by adaptive thresholding and a method of eliminating the partial aliasing of PSD by linear interpolation. Then we compared with the existing methods, the new algorithm is accurate and robust to noise. It is also shown that the PSD-based algorithm has good performance for wide range of Doppler spread and suitable for next generation wireless communication systems, such as TDLTE.
منابع مشابه
Enhancing massive MIMO: A new approach for Uplink training based on heterogeneous coherence time
Massive MIMO is one of the key technologies in future generation networks. Owing to their considerable spectral and energy efficiency gain, massive MIMO systems provide the needed performance to cope with the ever increasing wireless capacity demand. Nevertheless, the number of scheduled users stays limited in massive MIMO systems both in TDD and FDD modes. This is due to the limited time slot ...
متن کاملTDD ratio estimation scheme for WiBro system with flexible TDD frame structure
Since TDD (time-division duplex) operation provides several benefits including the flexibility to partition downlink and uplink ratio, several communication systems (such as long term evolution (LTE), Mobile worldwide interoperability for microwave access (m-WiMAX) etc) are operated with TDD. In the any systems mentioned above, it is hard to change the TDD ratio directly because the TDD ratio i...
متن کاملDoppler Spectrum Estimation by Ramanujan Fourier Transforms
The Doppler spectrum estimation of a weather radar signal in a classic way can be made by two methods, temporal one based in the autocorrelation of the successful signals, whereas the other one uses the estimation of the power spectral density PSD by using Fourier transforms. We introduces a new tool of signal processing based on Ramanujan sums cq(n), adapted to the analysis of arithmetical seq...
متن کاملNonparametric estimation of mean Doppler and spectral width
This paper proposes a new nonparametric method for estimation of spectral moments of a zero-mean Gaussian process immersed in additive white Gaussian noise. Although the technique is valid for any order moment, particular attention is given to the mean Doppler (first moment) and to the spectral width (square root of the centered second-spectral moment). By assuming that the power spectral densi...
متن کاملHeterogeneous Doppler Spread-based CSI Estimation Planning for TDD Massive MIMO
Massive multi-input multi-output (Massive MIMO) has been recognized as a key technology to meet the demand for higher data capacity and massive connectivity. Nevertheless, the number of active users is restricted due to training overhead and the limited coherence time. Current wireless systems assume the same coherence slot duration for all users, regardless of their heterogeneous Doppler sprea...
متن کامل