On the Sensitivity of the Transmit MIMO Wiener Filter With Respect to Channel and Noise Second-Order Statistics Uncertainties

Tsipouridou, D.; Liavas, Athanasios P.

doi:10.1109/tsp.2007.907840

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The propagation channel is assumed to be an L = 16-path frequency-selective block Rayleigh fading channel having uniform power delay profile. For the coded performance comparison, a turbo encoder using two (13,15) recursive systematic convolutional (RSC) encoders is used. A 2048 bit length codeword with the coding rate R = 1/2 is generated by puncturing the parity bit sequences.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The CE error is modeled as a zero-mean complex Gaussian random variable. The estimated channel gain matrices at the transmitter and the receiver can be, respectively, expressed as [13][14][15]…”

Section: Channel Estimation Error Modelmentioning

confidence: 99%

“…The CE error is modeled as a zero‐mean complex Gaussian random variable. The estimated channel gain matrices at the transmitter and the receiver can be, respectively, expressed as 13–15 where ν t (or r ) = diag{ ν t (or r ) (0), …, ν t (or r ) ( k ), …, ν t (or r ) ( N c − 1)} is a diagonal CE error matrix with each element ν t (or r ) ( k ) being a zero‐mean complex Gaussian variable having the variance 2 σ

_{italict (or italicr)}^{2}

. It should be noted that the CE errors at the transmitter and the receiver are assumed to be independent (i.e., E [ ν t ( k ) ν

_{italicr}^{*}

( k ′)] = 0 for ${\forall} $ k ′ = 0∼ N c − 1).…”

Section: Derivation Of Tx and Iterative Rx Mmse‐fde Weightsmentioning

confidence: 99%

“…However, in practical systems, sharing the perfect knowledge of CSI between the transmitter and receiver is almost impossible. Therefore, in this paper, we introduce a Gaussian approximation of channel estimation (CE) errors 13–15. We theoretically derive a set of Tx and iterative Rx FDE weights based on the MMSE criterion in the presence of CE error.…”

Section: Introductionmentioning

confidence: 99%

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Joint Tx/iterative Rx FDE for broadband direct‐sequence code division multiple access

Takeda¹,

Adachi²

2010

Wireless Communications

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Direct-sequence code division multiple access (DS-CDMA) is a promising uplink access technology for broadband cellular mobile communication systems. In this paper, we propose a joint transmit (Tx)/iterative receive (Rx) frequency-domain equalization (FDE) for DS-CDMA. In the proposed scheme, simple one-tap FDE at the transmitter and iterative one-tap FDE at the receiver are jointly performed using the common knowledge of channel state information (CSI). Before transmitting the signal, the transmitter predicts the degree of residual inter-chip interference (ICI) power after the iterations of Rx FDE to determine the Tx FDE weight while the receiver performs the iterative Rx FDE. In practice, it is almost impossible to share the perfect knowledge of CSI. In this paper, a Gaussian approximation of channel estimation (CE) errors is introduced. We theoretically derive a set of Tx and iterative Rx FDE weights based on the minimum mean square error (MMSE) criterion in the presence of the CE error. We show by computer simulation that the proposed scheme provides better bit error rate (BER) performance than the conventional scheme which uses iterative Rx FDE only (i.e., without Tx FDE) even in the presence of CE error.square error (MMSE) frequency-domain equalization (FDE) can be applied to suppress the ICI and hence, improve the BER performance [3][4][5][6][7][8]. However, the performance improvement is limited due to the presence of residual ICI after Rx FDE.Recently, iterative Rx FDE scheme [9,10] was proposed for DS-CDMA [8,11] to improve the BER performance by suppressing the residual ICI after Rx FDE. In this scheme, at first, a series of one-tap Rx FDE, despreading, and channel decoding is carried

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Channel Estimation Error Modelmentioning

confidence: 99%

_{italict (or italicr)}^{2}

. It should be noted that the CE errors at the transmitter and the receiver are assumed to be independent (i.e., E [ ν t ( k ) ν

_{italicr}^{*}

( k ′)] = 0 for ${\forall} $ k ′ = 0∼ N c − 1).…”

Section: Derivation Of Tx and Iterative Rx Mmse‐fde Weightsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joint Tx/iterative Rx FDE for broadband direct‐sequence code division multiple access

Takeda¹,

Adachi²

2010

Wireless Communications

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Joint transmit/receive one-tap minimum mean square error frequency-domain equalisation for broadband multicode direct-sequence code division multiple access

Takeda

Adachi

2010

IET Commun.

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Multicode direct-sequence code division multiple access (DS-CDMA) can flexibly support multimedia services with various data rates simply by changing the code multiplexing order. The use of simple one-tap frequency-domain equalisation (FDE) at a receiver is known to improve the bit error rate (BER) performance of multicode DS-CDMA in a severe frequency-selective fading environment. However, the BER performance improvement is limited due to the presence of the residual inter-chip interference (ICI). The authors propose a joint transmit/receive minimum mean square error (MMSE) FDE, which carries out one-tap transmit FDE and one-tap receive FDE jointly based on the MMSE criterion. The authors theoretically derive a suboptimal set of transmit and receive FDE weights and investigate the BER performance improvement by computer simulation in a freqeuncy-selective Rayleigh fading channel. The proposed scheme improves the received signal-tointerference plus noise ratio after despreading, and consequently, the BER performance can be significantly improved compared to the conventioal receive MMSE-FDE by (a) making the variations in the equivalent channel gain shallower to reduce the residual ICI for large code multiplexing order U and (b) allocating the transmit power to the frequencies having good condition to improve the received signal-to-noise ratio for a small U. This is conformed by the computer simualtion. Recently, multi-carrier (MC) signal transmission (i.e. orthogonal frequency division multiplexing (OFDM) and MC-CDMA) has been attracting attention [4-7]. In

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Recent advances in single-carrier frequency-domain equalization and distributed antenna network

Adachi

Takeda

Tatsunori

et al. 2009

2009 7th International Conference on Information, Communications and Signal Processing (ICICS)

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On the Sensitivity of the Transmit MIMO Wiener Filter With Respect to Channel and Noise Second-Order Statistics Uncertainties

Cited by 5 publications

References 6 publications

Joint Tx/iterative Rx FDE for broadband direct‐sequence code division multiple access

Joint Tx/iterative Rx FDE for broadband direct‐sequence code division multiple access

Joint transmit/receive one-tap minimum mean square error frequency-domain equalisation for broadband multicode direct-sequence code division multiple access

Recent advances in single-carrier frequency-domain equalization and distributed antenna network

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