Optimum receiver design for wireless broad-band systems using OFDM. I

Digital radio mondiale (DRM) is a terrestrial radio broadcasting standard to replace existing analogue AM and FM broadcasting, which is based on an orthogonal frequency division multiplexing (OFDM) technique. This paper focuses on the issue of estimating a sampling frequency offset (SFO) in OFDM-based broadcasting systems under frequency selective fading channels. In order to design a robust SFO estimation scheme and to benchmark its performance, the performance of the various conventional SFO estimation schemes is discussed and some improvements on the conventional estimation algorithms are highlighted. The simulation results show that such a design enhances the robustness of the proposed scheme against frequency selective fading.

show abstract

“…At the receiver, the l-th received OFDM symbol at the k-th subcarrier after FFT demodulation is given in [20,21] …”

Section: Signal Modelmentioning

confidence: 99%

Robust Sampling Frequency Offset Estimation for OFDM over Frequency Selective Fading Channels

Jung

You

2018

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…(1). The length of a signal frame at physical layer is 1 second, and each frame is divided into 40 slots, including a beacon and 53 OFDM symbols, each slot is 25ms, its beacon is composed by an ID signal from transmitter (TxID) and two identical sync signals [2], these sync signals are long PN sequence known, It can realize synchronization effectively and quickly, this is an important characteristic of frame structure, the most prominent place is also different from other broadcast frame [3][4][5].…”

Section: The Frame Structure Of Cmmb Systemmentioning

confidence: 99%

Coarse Symbol Timing Synchronization Improved Algorithm for CMMB Mobile TV

Lei¹,

Xie²,

Tan³

2014

TOAUTOCJ

View full text Add to dashboard Cite

There are some multipath and frequency offset in wireless transmission environment, in order to determine the correct starting position of each OFDM symbol, CMMB system must achieve accurate symbol synchronization for sending and receiving data, making FFT data transform window position in receiver consistent with IFFT window position in sender. This paper combined the specific frame structure of CMMB standard protocol, analyzed some influences of symbol synchronization timing errors in system, discussed the traditional ML (Maximum Likelihood) algorithm, the non data aided algorithm and the reverse conjugate symmetry direct algorithm, and based on the characteristics of these algorithm, proposed a coarse symbol timing synchronization improved algorithm according to CMMB mobile TV, the feasibility of this algorithm is verified in AWGN and multipath channel. Simulation results show that the performance of improved algorithm is better, there is no multi-peak of ML algorithm, and don't worry about appearing "lat roof" phenomenon like no data aided algorithm, and it also eliminates adjacent peak interference of the reverse conjugate symmetry direct algorithm, this algorithm is not limited by SNR, even in bad multipath channel condition, the approximate starting position of symbol can be estimated.

show abstract

“…Initialize ␣ 0 (S 0 ) and ␤ L (S L ), setting them to 1 in correspondence to the known starting and ending states and to zero otherwise. Recursively compute ␣ m (S m ) and ␤ m (S m ) according to (29) and (30).…”

Section: -D Markov Chain Representation and Maximum A Posteriori Mulmentioning

confidence: 99%

“…A technique for compensating time and frequency misalignments based on feedback control in a DMT-MA system is presented in [45]. On the other hand, a rich body of literature can be found on the study of receivers for DMT modulation in single-user applications in the presence of timing errors, frequency offsets, and multipath fading, e.g., [30,31] and associated references. An overview of equalization methods for DMT transceivers is presented in [28].…”

Section: Introductionmentioning

confidence: 99%

Asynchronous multicarrier multiple access: Optimal and sub-optimal detection and decoding

Tonello¹

2003

Bell Labs Tech. J.

View full text Add to dashboard Cite

Optimum receiver design for wireless broad-band systems using OFDM. I

Cited by 725 publications

References 25 publications

Robust Sampling Frequency Offset Estimation for OFDM over Frequency Selective Fading Channels

Robust Sampling Frequency Offset Estimation for OFDM over Frequency Selective Fading Channels

Coarse Symbol Timing Synchronization Improved Algorithm for CMMB Mobile TV

Asynchronous multicarrier multiple access: Optimal and sub-optimal detection and decoding

Contact Info

Product

Resources

About