Pilot Based Space-Time Transmission Scheme for Large MIMO System

Rani, Pratibha; Arti, M K; Dimri, Pradeep Kumar; Vashishath, Munish

doi:10.1109/spin.2019.8711644

Cited by 2 publications

(7 citation statements)

References 28 publications

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“…The expression of the MGF is obtained using the singular value decomposition [12,40] of the obtained matrix F.…”

Section: Moment-generating Functionmentioning

confidence: 99%

“…To achieve the same result, the entire term is multiplied by the left null of

{boldh}_{4}

. After nulling, it is observed through simulation that the left null of a column vector with more than two elements is a matrix [12, 40]. The nulling matrix is

F_{4} = {false(null false({\hat{boldh}}_{4}^{H} false) false)}^{H}

.…”

Section: System Model and Pilot‐based Sttsmentioning

confidence: 99%

“…

{boldE}_{1} = \frac{σ^{2}}{2} boldI

because through simulation, it is obtained that

F_{4} F_{4}^{H} = boldI

, where

boldI

denotes the identity matrix. For

N_{t} = 4

and

N_{r} = 4

, the size of the null matrix is 3

\times

4 as nulling decreases the size of the matrix by one [12, 40]. The maximum likelihood detection of

{boldd}_{1}

is obtained by maximizing the conditional probability density function (PDF) of the

δ_{1}

condition on

{boldF}_{4}

and

{boldh}_{2}

.…”

Section: System Model and Pilot‐based Sttsmentioning

confidence: 99%

“…The expression of the MGF is obtained using the singular value decomposition [12, 40] of the obtained matrix

boldF

. The decomposition of

boldF

is as follows:

false‖ F_{4} h_{2} ‖^{2} = false‖ boldV boldQ R^{H} h_{2} ‖^{2} = false‖ boldV boldQ {\tilde{boldh}}_{2} ‖^{2},

where Q represents a diagonal matrix, and

boldV

and

boldR

represent unitary matrices.…”

Section: Performance Analysismentioning

confidence: 99%

“…Pilots are also known as training symbols [12]. They are used to obtain the channel state information (CSI) of a communication system [13].…”

Section: Introductionmentioning

confidence: 99%

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Channel estimation and detection with space–time transmission scheme in colocated multiple‐input and multiple‐output system

2023

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In this study, a space–time transmission scheme is proposed to tackle the limitations of channel estimation with orthogonal pilot information in colocated multiple‐input multiple‐output systems with several transmitting and receiving antennas. Channel information is obtained using orthogonal pilots. Channel estimation introduces pilot heads required to estimate a channel. This leads to bandwidth insufficiency. As a result, trade‐offs exist between the number of pilots required to estimate a channel versus spectral efficiency. The detection of data symbols is performed using the maximum likelihood decoding method as it provides a consistent approach to parameter estimation problems. The moment‐generating function of the instantaneous signal‐to‐noise ratio is used to drive an approximate expression of the symbol error rate for the proposed scheme. Furthermore, the order of diversity is less by one than the number of receiver antennas used in the proposed scheme. The effect of the length of a pilot sequence on the proposed scheme's performance is also investigated.

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“…The expression of the MGF is obtained using the singular value decomposition [12,40] of the obtained matrix F.…”

Section: Moment-generating Functionmentioning

confidence: 99%

“…To achieve the same result, the entire term is multiplied by the left null of

{boldh}_{4}

. After nulling, it is observed through simulation that the left null of a column vector with more than two elements is a matrix [12, 40]. The nulling matrix is