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based first technique consists of householder reflection

QR operation, which having O (n3) floating point opera-

tions, further its having one SVD and two multiplication

process so total floating point operations are O (n3 + mn2

+ 2mn). Second novel technique having two QR decom-

position process with three multiplication process, hence

total operations related to this technique are O (2n3 +

3mn). Finally this analysis depicts that novel techniques

having less complexity compare to Whitening Rotation

based semi-blind channel estimation technique.

5. Conclusions

The work investigated for Householder based QR-OPML

and joint channel and data estimation based QR-NEW

semi-blind channel estimation techniques for Rayleigh

flat fading MIMO channel using two transmitter and six

receiver antennas combinations and various pilot sym-

bols. The simulations result shows that BER perform-

ance improves as number pilot symbols increase. Finally

those techniques compare with Whitening rotation (WR)

based semi-blind channel estimation technique and ob-

served House holder QR-OPML based first novel tech-

nique with perfect R outperforms WR based semi-blind

technique with low complexity.

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