Abstract: A method, system, and computer program product for frame and frequency synchronization in packet-based Orthogonal Frequency Division Multiplexing (OFDM) in wireless digital communication systems. An OFDM packet includes a preamble preceded by a Cyclic Prefix (CP). The method includes computing a timing metric for packet-based OFDM. The timing metric yields a sharp peak at a preamble boundary. The preamble boundary is detected, based on a threshold. The threshold is determined a priori, based on mean and variance of the timing metric at the preamble boundary and in its neighborhood. The mean and the variance are evaluated for an Additive White Gaussian Noise (AWGN) channel. The detection of the preamble boundary enables frame synchronization in packet-based OFDM. The method further involves the task of frequency-offset estimation, using the preamble. The frequency-offset estimation enables frequency synchronization in packet-based OFDM.

Abstract: Various embodiments of the present invention relate to a method and system for Vertical Bell Layered Space-Time (V-BLAST) detection with near Maximum Likelihood (ML) performance and low complexity. The V-BLAST system is a Multiple-Input Multiple-Output (MIMO) system. A receiver is provided that detects the data transmitted from the multiple transmitting antennas. The detection performance of such a method and system is better than that of linear receivers while keeping the complexity of the receiver marginally higher than that of the linear receivers. The detection performance of such a method and system is very close to that of the ML receiver while its complexity is much less than that of the ML receiver.