In this article we use Monte Carlo analysis to assess the small sample behaviour of the OLS, the weighted least squares (WLS) and the mixed effects metaestimators under several types of effect size heterogeneity, using the bias, the mean squared error and the size and power of the statistical tests as performance indicators. Specifically, we analyse the consequences of heterogeneity in effect s...

Orthogonal frequency division multiplexing (OFDM) is a pramising technique for multi-antenna broadband systems, since it significantly reduces receiver complexity by providing orthogonal suhchannels. A drawback of OFDM systems is the performancelrate reduction due to the cyclic prefix overhead. In this paper, we propose receiver structures that exploit the cyclic prefix to increase the performa...

Statistical literature has several methods for coping with multicollinearity. This paper introduces a new shrinkage estimator, called modified unbiased ridge (MUR). This estimator is obtained from unbiased ridge regression (URR) in the same way that ordinary ridge regression (ORR) is obtained from ordinary least squares (OLS). Properties of MUR are derived. Results on its matrix mean squared er...