Pilot assisted channel estimation for OFDM in mobile cellular systems

Tufvesson, Fredrik; Maseng, Torleiv

doi:10.1109/vetec.1997.605836

Cited by 104 publications

(50 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, the comb-type pilot pattern, in which pilot symbols are inserted and continuously transmitted over specific pilot subchannels in all OFDM blocks, is naturally preferred and highly desirable for effectively and accurately tracking channel time-variations (Negi & Cioffi, 1998;Wilson et al, 1994;Hoeher, 1991;Hsieh & Wei, 1998). Several methods for allocating pilots on the time-frequency grid have been studied (Tufvesson & Maseng, 1997). Two primary pilot assignments are depicted in Fig.…”

Section: Preliminarymentioning

confidence: 99%

Channel Estimation for Wireless OFDM Communications

Lin¹

2010

Communications and Networking

View full text Add to dashboard Cite

Section: Preliminarymentioning

confidence: 99%

Channel Estimation for Wireless OFDM Communications

Lin¹

2010

Communications and Networking

View full text Add to dashboard Cite

“…Let be the obtained from by removing its last columns, and define as . Due to the zeros at the FFT input, can also be expressed as (19) Thus, it is possible to proceed as in Section III to obtain the channel coefficients from the autocorrelation matrix of the received signal (20) where . Consistently with the p.o.e.…”

Section: Subspace Estimation With Null Side Carriersmentioning

confidence: 99%

“…In that case, they are referred as semi-blind methods [18]. Usually, known blocks of symbols (usually referred as "pilot symbols") are transmitted at the beginning of each frame for synchronization and initial channel estimation purposes [19], [20]. We propose to use them to avoid the convergence period of the blind subspace algorithm, during which the estimation is unreliable.…”

mentioning

confidence: 99%

Subspace-based blind and semi-blind channel estimation for OFDM systems

Muquet

Courville

Duhamel

2002

IEEE Trans. Signal Process.

284

178

View full text Add to dashboard Cite

Abstract-This paper proposes a new blind channel estimation method for orthogonal frequency division multiplexing (OFDM) systems. The algorithm makes use of the redundancy introduced by the cyclic prefix to identify the channel based on a subspace approach. Thus, the proposed method does not require any modification of the transmitter and applies to most existing OFDM systems. Semi-blind procedures taking advantage of training data are also proposed. These can be training symbols or pilot tones, the latter being used for solving the intrinsic indetermination of blind channel estimation. Identifiability results are provided, showing that in the (theoretical) situation where channel zeros are located on subcarriers, the algorithm does not ensure uniqueness of the channel estimation, unless the full noise subspace is considered. Simulations comparing the proposed method with a decision-directed channel estimator finally illustrates the performance of the proposed algorithm.

show abstract

“…Channel estimation for various pilot patterns is discussed in [10] and references therein. A great amount of research covering channel estimation for OFDM has been done over the years and much of it can be modified and applied to GFDM systems.…”

Section: Introductionmentioning

confidence: 99%

Training Based Channel Estimation for Multitaper GFDM System

Bandari¹,

Vakamulla²,

Drosopoulos³

2017

Mobile Information Systems

View full text Add to dashboard Cite

Recent activities in the cellular network world clearly show the need to design new physical layer waveforms in order to meet future wireless requirements. Generalized Frequency Division Multiplexing (GFDM) is one of the leading candidates for 5G and one of its key features is the usage of circular pulse shaping of subcarriers to remove prototype filter transients. Due to the nonorthogonal nature of the conventional GFDM system, inherent interference will affect adversely channel estimation. With Discrete Prolate Spheroidal Sequences (DPSSs) or multitapers as prototype filters an improved orthogonal GFDM system can be developed. In this work, we investigate channel estimation methods for multitaper GFDM (MGFDM) systems with and without Discrete Fourier Transform (DFT). The simulation results are presented using Least Squares (LS) and Minimum Mean Square Error (MMSE) channel estimation (CE) methods. DFT based CE methods provide better estimates of the channel but with an additional computational cost.

show abstract

Pilot assisted channel estimation for OFDM in mobile cellular systems

Cited by 104 publications

References 2 publications

Channel Estimation for Wireless OFDM Communications

Channel Estimation for Wireless OFDM Communications

Subspace-based blind and semi-blind channel estimation for OFDM systems

Training Based Channel Estimation for Multitaper GFDM System

Contact Info

Product

Resources

About