Channel estimation for an SVD-MIMO System

Lebrun, G.; Spiteri, Shane; Faulkner, M.

doi:10.1109/icc.2004.1313087

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…Therefore, at times when this difference is small, there is a corresponding increase in the power loss and the interference. Similar observations have been made in [10], [11] and [12], where it was noted that a small variation in the channel can result in major shifts in the steering matrices, especially when two singular values (and therefore eigenvalues) are of a similar magnitue.…”

Section: Introductionsupporting

confidence: 57%

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Instantaneous Signal and Self-Interference Power of MIMO Eigenmode Transmission with Feedback Time Delay

Kuo

Smith

Garth

et al. 2006

2006 IEEE International Conference on Communications

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Abstract-Singular Value Decomposition (SVD) techniques are well-known for providing an elegant transceiver architecture, that can realize the intrinsic spatial links of a MIMO channel. Such a scheme is also referred to as eigen-beamforming or eigenmode transmission. The system performance is, however, closely related to the quality of the channel information at both ends of the link. Hence, we focus on the effect of feedback time delay, which causes the transmitter to use outdated channel information in timevarying fading channels. In this paper, we derive an analytical expression for the instantaneous SINR of eigenmode transmission with a feedback time delay τ . Furthermore, this expression implies a novel metric that gauges the system performance sensitivity to time-variations of the steering vectors (eigenvectors of the channel correlation matrix) at the transmitter.

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Section: Introductionsupporting

confidence: 57%

“…The results in Fig. 1 were obtained from the SDE for dv 11 (t) in a (2,2) system. As can be seen, the simulated values of (∆v ij (t)+β)/α match the Gaussian extremely well.…”

Section: B a Modified Sdementioning

confidence: 99%

Instantaneous Signal and Self-Interference Power of MIMO Eigenmode Transmission with Feedback Time Delay

Kuo

Smith

Garth

et al. 2006

2006 IEEE International Conference on Communications

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“…Many researches have been investigated to reduce the degradation of the BF [9] or to design precoding schemes to improve system performance under a constrained backhaul and imperfect channel knowledge [10], [11]. For the reasons above, in realistic systems such as LTE, feedback CSI is quantized and certainly BS cooperation performance is inferior to the precoding with ideal CSI at transmitters.…”

Section: Introductionmentioning

confidence: 99%

A bit interleaved repetition coded base station cooperation for downlink OFDM signaling

Yuan

Ibi

Sampei

2011

2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications

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This paper presents a novel base station (BS) cooperation scheme to address issues on fatal links experienced by cell-edge users based on bit interleaved repetition coded (BIRC) concatenated structures for downlink OFDM scenarios. A primary focus is on employing independent random interleavers in cooperating BSs following by BS cooperation which may be regarded as the repetition code. In early works related to the BS cooperation, the main paradigm was just for an enhancement of signal levels after a signal combining, in terms of improvements of channel capacity. However, in order to achieve the enhanced channel capacity, we have to design not only appropriate channel codes but also perfect channel state information (CSI) notifications. The proposed simple BIRC based BS cooperation technique has a potential to overcome above mentioned issues through unified design via an iterative fashion. In this paper, high diversity and coding gains of BIRC based BS cooperation are observed in computer simulations, comparing to an Alamouti's STBC based BS cooperation scheme.

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“…The unitary precoding matrix used in downlink transmission is derived through operating the singular value decomposition (SVD) of uplink channel estimation. Because SVD is a non-linear function, little difference between uplink and downlink could result in mismatch between precoding matrix and decoding matrix, which would seriously degrade the system performance [4] [5]. So, [6] [7] proposes to use Wiener filter to predict the CSI in next downlink transmission.…”

Section: Introductionmentioning

confidence: 99%

A Codebook Based Precoding Scheme for 3GPP TDD Systems

Liu

Wang

Huang

2008

2008 4th International Conference on Wireless Communications, Networking and Mobile Computing

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In time-division duplex (TDD) system, precoding matrix for downlink transmission can be obtained from estimation of uplink pilots by using reciprocity. However, if the channel is time-varying, the channel difference would cause codeword mismatch between transmitter and receiver, which leads to performance degradation. In this paper, a codebook based precoding scheme is proposed for TDD systems to decrease the probability of codeword mismatch between both sides. Moreover, a linear interpolation method is used to estimate the uplink channel at the receiver, which would reduce the channel difference caused by time delay. Simulations show that the proposed scheme could significantly improve the link performance compared to the existing methods.

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Channel estimation for an SVD-MIMO System

Cited by 11 publications

References 12 publications

Instantaneous Signal and Self-Interference Power of MIMO Eigenmode Transmission with Feedback Time Delay

Instantaneous Signal and Self-Interference Power of MIMO Eigenmode Transmission with Feedback Time Delay

A bit interleaved repetition coded base station cooperation for downlink OFDM signaling

A Codebook Based Precoding Scheme for 3GPP TDD Systems

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