Joint Phase/Amplitude Estimation and Symbol Detection for Wireless ICI Self-Cancellation Coded OFDM Systems

Wu, Hsiao-Chun; Huang, Xiaozhou

doi:10.1109/tbc.2004.824746

Cited by 56 publications

(15 citation statements)

References 15 publications

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“…The goal is to achieve an optimal combination of spectrum efficiency and estimation accuracy [16][17][18][19][20]. Among the existing OFDM channel estimation approaches, some are based on the time-multiplexed pilot, frequency-multiplexed pilot, and scattered pilot [21].…”

Section: Introductionmentioning

confidence: 99%

Compressive Sensing Based High-Resolution Channel Estimation for OFDM System

Meng¹,

Yin

et al. 2012

IEEE J. Sel. Top. Signal Process.

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Abstract-Orthogonal frequency division multiplexing (OFDM) is a technique that will prevail in the next generation wireless communication. Channel estimation is one of the key challenges in OFDM, since high-resolution channel estimation can significantly improve the equalization at the receiver and consequently enhance the communication performances. In this paper, we propose a system with an asymmetric DAC/ADC pair and formulate OFDM channel estimation as a compressive sensing problem. By skillfully designing pilots and taking advantages of the sparsity of the channel impulse response, the proposed system realizes high resolution channel estimation at a low cost. The pilot design, the use of a high-speed DAC and a regular-speed ADC, and the estimation algorithm tailored for channel estimation distinguish the proposed approach from the existing estimation approaches. We theoretically show that in the proposed system, a N -resolution channel can be faithfully obtained with an ADC speed at M = O(S 2 log(N/S)), where N is also the DAC speed and S is the channel impulse response sparsity. Since S is small and increasing the DAC speed to N > M is relatively cheap, we obtain a high-resolution channel at a low cost. We also present a novel estimator that is both faster and more accurate than the typical 1 minimization. In the numerical experiments, we simulated various numbers of multipaths and different SNRs and let the transmitter DAC run at 16 times the speed of the receiver ADC for estimating channels at the 16x resolution. While there is no similar approaches (for asymmetric DAC/ADC pairs) to compare with, we derive the Cramér-Rao lower bound.

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Section: Introductionmentioning

confidence: 99%

Compressive Sensing Based High-Resolution Channel Estimation for OFDM System

Meng¹,

Yin

et al. 2012

IEEE J. Sel. Top. Signal Process.

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“…In this work Manuscript we extend the use of the CEQ to multicarrier OFDM systems by applying the same principle in the frequency domain [3], [4]. Reference symbols-so-called pilot symbols-are applied to pilot sub-channels (carriers) before the IFFT in the transmitter [5].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Concurrent Equalization Applied to Multicarrier OFDM Systems

D'Agostini

Carboni

Castro

et al. 2008

IEEE Trans. on Broadcast.

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Receivers for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems usually perform the channel estimation based on pilot carriers in known positions of the channel spectrum. Interpolation is applied between pilot carriers to determine the channel transfer function in all carrier frequencies. Channel variations along time are compensated by means of interpolation between successive channel estimates on the same carrier frequency. However, not rarely do fast channel variations exceed the time interpolator capability, as is the case for mobile operation. In this article we propose a new technique based on concurrent deconvolution, as a mean to further increase the time interpolator capability. Concurrent deconvolution, also known as concurrent equalization, is based on the concurrent operation of two stochastic gradient time-domain algorithms. One gradient-based algorithm minimizes a cost function that measures the received signal energy dispersion and the other minimizes the Euclidean distance between the received digital modulation symbols and the ones in the reference constellation which are assigned to each OFDM sub-channel. Results show that the proposed technique, when subsequently applied to the time interpolation stage, improves the system robustness for fast varying channels. The whole channel compensation computational cost is increased by the cost of a two coefficient multirate adaptive FIR filter, added only to those subcarriers at the FFT output to which a pilot sequence has not been assigned.

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“…The PN sequence with non-ideal autocorrelation property in conventional TDS-OFDM systems is not optimal for channel estimation [13], [14]. Instead, the modulable orthogonal sequence (MOS) [15] will be adopted as the TS (2) where , , , is relatively prime to , and .…”

Section: A Time-frequency Signal Structurementioning

confidence: 99%

Joint Time-Frequency Channel Estimation for Time Domain Synchronous OFDM Systems

Dai

Hanzo

Wang

et al. 2013

IEEE Trans. on Broadcast.

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As the key technology of Chinese national digital television terrestrial broadcasting (DTTB) standard, time domain synchronous OFDM (TDS-OFDM) has high spectral efficiency at the cost of performance loss over fast fading channels. In this paper, a novel time-frequency signal structure is proposed to improve the system performance of TDS-OFDM over fast time-varying channels. Each TDS-OFDM symbol adopts the time-domain one-sample shifted training sequence (TS) and the frequency-domain grouped pilots as the time-frequency training information. The modulable orthogonal sequence (MOS) with perfect autocorrelation property is adopted as the TS, while each pilot group has only one non-zero central pilot surrounded by several zero pilots. The corresponding joint time-frequency channel estimation utilizes the time-domain TS for path delay estimation and the frequency-domain grouped pilots for path gain estimation, thus accurate tracking of the fast time-varying wireless channel could be achieved. Only about 1% of the total subcarriers will be occupied by the redundant grouped pilots, thus the loss in spectral efficiency is negligible. Simulation results demonstrate that the proposed scheme outperforms the conventional solutions over fast fading channels.Index Terms-Digital television terrestrial broadcasting (DTTB), fast fading channel, joint time-frequency channel estimation, time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM), time-frequency training.

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Joint Phase/Amplitude Estimation and Symbol Detection for Wireless ICI Self-Cancellation Coded OFDM Systems

Cited by 56 publications

References 15 publications

Compressive Sensing Based High-Resolution Channel Estimation for OFDM System

Compressive Sensing Based High-Resolution Channel Estimation for OFDM System

Adaptive Concurrent Equalization Applied to Multicarrier OFDM Systems

Joint Time-Frequency Channel Estimation for Time Domain Synchronous OFDM Systems

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