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Cyclic-prefix code division multiple access (CP-CDMA) has been shown to be effective in combating frequency selective fading channels. However, this effectiveness can be leveraged only with accurate channel impulse response (CIR) estimate and proper compensation for the carrier frequency offset (CFO). In this paper, we formulate a subspace-based joint CFO and CIR estimator without using any pilot...
Liu and Tureli proposed a blind carrier frequency offset (CFO) estimation method for orthogonal frequency-division multiplexing (OFDM) systems, making use of null subcarriers. The optimal subcarrier placement that minimizes the Cramer-Rao bound (CRB) of the CFO estimation was reported by Ghogho. In this paper, we study the optimality of the null subcarrier placement from another perspective. We first...
In this paper, we analyze the propagation of orthogonality error for fast Rayleighpsilas quotient based adaptive noise subspace algorithm (FRANS). First, we examine the propagation of orthogonality error for the numerically unstable FRANS in the mean and in the mean-square sense. Then, numerically stable FRANS with householder transformation (HFRANS) is studied through simulation as an improvement...
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