Measurement of Demmel condition number for 2×2 MIMO-OFDM broadband channels

Kita, Naoki; Yamada, Wataru; Satô, Akio; Mori, Daisuke; Uwano, Shuta

doi:10.1109/vetecs.2004.1387961

Cited by 10 publications

(15 citation statements)

References 8 publications

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“…It is apparent that among all environments, the most suitable for employment of 2 × 2 SM systems is the one of Syggrou Avenue. Similar results, but for indoor environments, have also been provided in [36].…”

Section: Mimo Channel Characterization For Short Range Fixed Wirelesssupporting

confidence: 75%

MIMO Channel Characterization for Short Range Fixed Wireless Propagation Environments

Skentos

Kanatas

Dallas

et al. 2006

Wireless Pers Commun

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This paper reports results from wideband MIMO measurements performed in short range fixed wireless environments at 5.2 GHz. The objective is to provide MIMO channel characterization results for the measured environments and contribute to the limited available similar studies. Two kinds of propagation scenarios are investigated, rooftop to rooftop and street to rooftop, at three different sites always under LOS propagation conditions. The analysis of measurement data is performed in the context of non physical modeling, providing insight into the statistics of the measured channels. In particular, the slow time varying nature of the channel is studied and the narrow Doppler spectrum shape is approximated. Furthermore, frequency correlation results are obtained and the typical delay dispersion measures are extracted. Then, the antenna correlation is studied and the error of the Kronecker product approximation is evaluated. Finally, capacity results are provided and the channel measurements are characterized in terms of spatial multiplexing quality and multipath richness through condition number analysis.

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Section: Mimo Channel Characterization For Short Range Fixed Wirelesssupporting

confidence: 75%

MIMO Channel Characterization for Short Range Fixed Wireless Propagation Environments

Skentos

Kanatas

Dallas

et al. 2006

Wireless Pers Commun

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“…For a detailed review of DCN mathematical applications, see [57]. Apart from [39,40], the DCN has also found application in the analysis of indoor MIMO-OFDM systems [58], and in the analytical prediction of level-crossing and fade duration statistics of i.i.d. Rayleigh channels [59].…”

Section: Statistics Of the Demmel Condition Numbermentioning

confidence: 99%

On the condition number distribution of complex wishart matrices

Matthaiou

McKay

Smith

et al. 2010

IEEE Trans. Commun.

117

122

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Abstract-This paper investigates the distribution of the condition number of complex Wishart matrices. Two closely related measures are considered: the standard condition number (SCN) and the Demmel condition number (DCN), both of which have important applications in the context of multiple-input multipleoutput (MIMO) communication systems, as well as in various branches of mathematics. We first present a novel generic framework for the SCN distribution which accounts for both central and non-central Wishart matrices of arbitrary dimension. This result is a simple unified expression which involves only a single scalar integral, and therefore allows for fast and efficient computation. For the case of dual Wishart matrices, we derive new exact polynomial expressions for both the SCN and DCN distributions. We also formulate a new closed-form expression for the tail SCN distribution which applies for correlated central Wishart matrices of arbitrary dimension and demonstrates an interesting connection to the maximum eigenvalue moments of Wishart matrices of smaller dimension.Based on our analytical results, we gain valuable insights into the statistical behavior of the channel conditioning for various MIMO fading scenarios, such as uncorrelated/semi-correlated Rayleigh fading and Ricean fading.

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“…The throughput of the receiver is k n    , where we compute n  using (17), (18), (19), or (20) depending upon the retransmission method. For the throughput of a receiver without selective retransmission, m = 0.…”

Section: Throughput Under Selective Retransmissionmentioning

confidence: 99%

“…The condition number of the channel matrix of a MIMO-OFDM subcarrier provides a good measure of the quality of the subcarrier, especially for suboptimal receivers at high signal-to-noise ratio (SNR) [17]. Several reports discuss the impact of the condition number on channel quality [18]- [20]. The impact of condition number on the received SNR is presented in [18]- [19].…”

Section: Introductionmentioning

confidence: 99%

Bandwidth-Efficient Selective Retransmission for MIMO-OFDM Systems

Muhammad¹,

Kiani²,

Saqib³

et al. 2015

ETRI J

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In this work, we propose an efficient selective retransmission method for multiple-input and multipleoutput (MIMO) wireless systems under orthogonal frequency-division multiplexing (OFDM) signaling. A typical received OFDM frame may have some symbols in error, which results in a retransmission of the entire frame. Such a retransmission is often unnecessary, and to avoid this, we propose a method to selectively retransmit symbols that correspond to poor-quality subcarriers. We use the condition numbers of the subcarrier channel matrices of the MIMO-OFDM system as a quality measure. The proposed scheme is embedded in the modulation layer and is independent of conventional hybrid automatic repeat request (HARQ) methods. The receiver integrates the original OFDM and the punctured retransmitted OFDM signals for more reliable detection. The targeted retransmission results in fewer negative acknowledgements from conventional HARQ algorithms, which results in increasing bandwidth and power efficiency. We investigate the efficacy of the proposed method for optimal and suboptimal receivers. The simulation results demonstrate the efficacy of the proposed method on throughput for MIMO-OFDM systems.

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Measurement of Demmel condition number for 2×2 MIMO-OFDM broadband channels

Cited by 10 publications

References 8 publications

MIMO Channel Characterization for Short Range Fixed Wireless Propagation Environments

MIMO Channel Characterization for Short Range Fixed Wireless Propagation Environments

On the condition number distribution of complex wishart matrices

Bandwidth-Efficient Selective Retransmission for MIMO-OFDM Systems

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