Subblock Processing for MMSE-FDE Under Fast Fading Environments

Kambara, K.; Nishimoto, Hiroshi; Nishimura, Toshihiko; Ogawa, Yasutaka; Ohgane, Takeo

doi:10.1109/vetecs.2007.452

Cited by 5 publications

(25 citation statements)

References 9 publications

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“…For example, the ratio of inserted errors in the subblock in the case of N = 1024 and M = 8 is similar to the one in the case of N = 256 and M = 2. Thus, if the block size is larger than this study, the optimum number of subblock may change [6]. Optimizing the number of subblocks is an important issue to be solved.…”

Section: Bler Performance Of Fdte Based On Subblock Processingmentioning

confidence: 96%

“…, σ 2 e,N−1 ), where σ 2 e,k is an equivalent noise power at the kth frequency point. The approximate calculation for the equivalent noise power is derived in [6].…”

Section: Residual Interference Component Due To Fast Fadingmentioning

confidence: 99%

“…Although the FDTE has a capability to reduce the ISI by soft cancellation, the perfect cancellation can not be expected due to the channel change, i.e., the error in the replica generation, in the fast fading environment. To apply FDE or FDTE under much faster fading environments, therefore, we have proposed the subblock processing described in the next section [5], [6].…”

Section: Residual Interference Component Due To Fast Fadingmentioning

confidence: 99%

“…The pseudo received signal satisfies periodicity within each subblock when the soft replica and the estimated channel are reasonably correct. (The above pseudo CP procedure can be also expressed symbol by symbol as explained in [5].) Thus, the signal now can be equalized by subblockbased FDTE.…”

Section: Subblock Processing Conceptmentioning

confidence: 99%

“…In addition, the transmitter needs to know information about the fading speed as a closed-loop system is required. Thus, we have proposed subblock FDE processing at the receiver side where the received block is divided into multiple subblocks [5], [6]. It has been clarified that the proposed subblock processing provides remarkable improvement in FDE performance.…”

Section: Introductionmentioning

confidence: 99%

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Subblock Processing for Frequency-Domain Turbo Equalization under Fast Fading Environments

Kambara

Nishimoto

Nishimura

et al. 2009

IEICE Trans. Commun.

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SUMMARYFrequency-domain equalization (FDE) has been studied for suppressing inter-symbol interference (ISI) due to frequency selective fading in single carrier systems. When a high-mobility terminal is assumed in the system, channel transition within an FDE block cannot be ignored. The ISI reduction performance of FDE degrades since the cyclicity of the channel matrix is lost. To solve this problem, a method of dividing the received data block into multiple subblocks has been proposed, where pseudo cyclic prefix (CP) processing is introduced to realize periodicity in each subblock. In this method, the performance is degraded by the inherentlyinaccurate pseudo CP. In this paper, we study the application of frequencydomain turbo equalization (FDTE) to subblock processing for improving the accuracy of pseudo CP. The simulation results show that FDTE with subblock processing yields remarkable performance improvements. key words: fast fading, single carrier transmission, SC/MMSE-FDTE, unique word, subblock processing

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Section: Bler Performance Of Fdte Based On Subblock Processingmentioning

confidence: 96%

“…, σ 2 e,N−1 ), where σ 2 e,k is an equivalent noise power at the kth frequency point. The approximate calculation for the equivalent noise power is derived in [6].…”

Section: Residual Interference Component Due To Fast Fadingmentioning

confidence: 99%

Section: Residual Interference Component Due To Fast Fadingmentioning

confidence: 99%

Section: Subblock Processing Conceptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Subblock Processing for Frequency-Domain Turbo Equalization under Fast Fading Environments

Kambara

Nishimoto

Nishimura

et al. 2009

IEICE Trans. Commun.

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A sub-block orthogonal single carrier frequency domain equalization system in fast Rayleigh fading channel

Gao

Wang

2010

Sci. China Inf. Sci.

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In this paper, we analyze the frequency domain linear equalization (FDLE) of single carrier block transmission (SCBT) systems under fast fading channel. First, we propose a new approximating model in which the channel is assumed to be static in sub-blocks vary each other. Based on this model, we derive a new 2-orthogonal-sub-blocked frequency domain equalization method. Then, we derive the conditions of the channel under which the equalization method can be applied to the 2-orthogonal-sub-blocked systems. Simulation demonstrates that the proposed method can improve the anti-Doppler ability of SC-FDLE and at the same time keep its high efficiency and low complexity. CitationLiu R, Gao X Q, Wang W J. A sub-block orthogonal single carrier frequency domain equalization system in fast Rayleigh fading channel.

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EXIT chart analysis for the bit-interleaved turbo frequency domain equalization under fast fading environments

Polprasert

Ritcey

2009

2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers

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Time variation of wireless fading channels introduces interference in block-based transmissions such as orthogonal frequency division multiplexing (OFDM) or single-carrier frequency domain equalization (SC-FDE). The interference, called inter-carrier interference (ICI) in OFDM or residual inter-symbol interference (ISI) in SC-FDE, impacts the bit error rate performance resulting in an error floor. In this paper, we investigate the performance of the bit-interleaved turbo frequency domain equalization (Bi-TFDE) over frequency-selective fading channels with the residual ISI. We focus on the impact of the residual ISI on the convergence signal-to-noise ratio (SNR) threshold using the extrinsic information transfer (EXIT) chart. We first show that the Gaussian assumption of the soft information within the TFDE corrupted by the residual ISI can accurately track the flow of the extrinsic information in the iterative procedure. Then, we demonstrate the accuracy of the EXIT chart in predicting the transfer function of the equalizer. Hence, the convergence behavior of the TFDE, with the residual ISI, is parameterized by the product of the symbol block length and Doppler spread.The accuracy of our EXIT chart prediction is verified by simulation.

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Subblock Processing for MMSE-FDE Under Fast Fading Environments

Cited by 5 publications

References 9 publications

Subblock Processing for Frequency-Domain Turbo Equalization under Fast Fading Environments

Subblock Processing for Frequency-Domain Turbo Equalization under Fast Fading Environments

A sub-block orthogonal single carrier frequency domain equalization system in fast Rayleigh fading channel

EXIT chart analysis for the bit-interleaved turbo frequency domain equalization under fast fading environments

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