Reduced-Complexity ICI Mitigation for Mobile SFBC-OFDM with Application to DVB-H

Lu, Sili; Narasimhan, Balachander; Al-Dhahir, Naofal

doi:10.1109/wcnc.2008.213

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…2. It uses the super-block structure described in [12]. In conventional SFBC OFDM, one Alamouti code-block occupies two adjacent sub-carriers and in the presence of mobility, it would result in intra-code-block interference which destroying the orthogonality and performance of the Alamouti code.…”

Section: A Alamouti Sfbcmentioning

confidence: 99%

Reduced-complexity baseband compensation of joint Tx/Rx I/Q imbalance in mobile MIMO-OFDM

Narasimhan

Narayanan

Minn

et al. 2010

IEEE Trans. Wireless Commun.

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Abstract-Direct-conversion multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transceivers enjoy high data rates and reliability at practical implementation complexity. However, analog front-end impairments such as I/Q imbalance and high mobility requirements of nextgeneration broadband wireless standards result in performancelimiting inter-carrier interference (ICI). In this paper, we study the effects of ICI due to these impairments for OFDM with space frequency block codes and spatial multiplexing, derive a generalized linear model and propose a non-iterative reduced-complexity digital baseband joint compensation scheme. Furthermore, we present a pilot scheme for joint estimation of the channel and the I/Q imbalance parameters and evaluate its performance through simulations. Our proposed scheme is effective in estimating and compensating for frequency-independent and frequencydependent transmit and receive I/Q imbalances even in the presence of a residual frequency offset.

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Section: A Alamouti Sfbcmentioning

confidence: 99%

Reduced-complexity baseband compensation of joint Tx/Rx I/Q imbalance in mobile MIMO-OFDM

Narasimhan

Narayanan

Minn

et al. 2010

IEEE Trans. Wireless Commun.

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“…The SFBC-OFDM scheme we consider in this paper is similar to the one we proposed in [2], but modified to account for the symmetry considerations that arise due to I/Q Imbalance. A super-block structure is used as shown in Fig Chunks of D pilots help avoid subcarrier leakage across super-blocks and groups within the same super-block.…”

Section: I/q Imbalance In Sfbc-ofdmmentioning

confidence: 99%

“…Therefore, we arrange the Alamouti superblocks of [2] in such a manner that every super-block coincides with a corresponding image super-block, i.e., a super-block that spans the…”

Section: I/q Imbalance In Sfbc-ofdmmentioning

confidence: 99%

“…The equivalent frequency-domain channel matrix for the proposed SFBC under mobility can be represented by a banded block structure where each block is an Alamouti codeword [2]. In the presence of both I/Q imbalance and mobility, it can be shown that the banded block structure still holds but the blocks are similar to G l,l (k, m) in (4).…”

Section: Modeling Of I/q Imbalance With Mobilitymentioning

confidence: 99%

“…In [12], we proposed the model and compensation scheme for receiver I/Q imbalance with mobility. In [2], we proposed an Alamouti-SFBC scheme which enables a desirable trade-off between performance and detection complexity. In this paper, we extend this scheme to include the effect of I/Q imbalance.…”

Section: Introductionmentioning

confidence: 99%

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Digital Baseband Compensation for Mobile SFBC-OFDM Systems with Receiver I/Q Imbalance

Narasimhan

Wang

Narayanan

et al. 2008

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

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Abstract-In-phase and Quadrature-phase (I/Q) imbalance is a major performance-limiting impairment for directconversion Orthogonal Frequency Division Multiplexing (OFDM) transceivers. I/Q imbalance degrades the Signal-to-Noise-Ratio in an OFDM system by causing Inter-Channel-Interference (ICI) between image subcarriers. Doppler spread due to mobility also causes ICI but mainly between adjacent subcarriers. In this work, we investigate the combined effects of mobility and I/Q imbalance in a Multiple-Input-Multiple-Output-OFDM system with the Alamouti Space-Frequency Block-Coding scheme and design an effective compensation technique. Furthermore, we propose a novel pilot allocation and channel estimation scheme, and exploit the problem structure to reduce complexity.

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Novel transmit diversity approach combining SFBC and CDD in LTE-Advanced system

Cai

Zhang

Duan

2011

2011 IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems

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Reduced-Complexity ICI Mitigation for Mobile SFBC-OFDM with Application to DVB-H

Cited by 3 publications

References 7 publications

Reduced-complexity baseband compensation of joint Tx/Rx I/Q imbalance in mobile MIMO-OFDM

Reduced-complexity baseband compensation of joint Tx/Rx I/Q imbalance in mobile MIMO-OFDM

Digital Baseband Compensation for Mobile SFBC-OFDM Systems with Receiver I/Q Imbalance

Novel transmit diversity approach combining SFBC and CDD in LTE-Advanced system

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