Search for: [Abstrakt = "In this paper, channel estimation capabilities of a multiple\-input multiple\-output \(MIMO\) system using superimposed training sequences are investigated. A new expression for estimation\-error variance is derived. It is shown that the training sequences must be balanced and must have specific correlation properties. The latter are required only in a specific zone. Sequences that satisfy these criteria exist and are referred to as zero\-correlation zone \(ZCZ\) solutions. Consequently, by using balanced ZCZ sequences, harmful direct current \(DC\) offset can be removed. Owing to their zero\-cross correlation, interference from other transmitting antennas may be eliminated. Furthermore, a closed\-form expression of the estimation\-error variance can be obtained due to their impulse\-like autocorrelation. To increase the number of antennas in the MIMO system, a new construction of ZCZ sequence set is proposed, in which all sequences are balanced."]

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