Patent ID: 8498329
Filing Date: 2013-07-30
Classification: H04B

Abstract:
1. An apparatus comprising: a multiple-user mean-squared error (MMSE) equaliser configured to receive signals from a number of users and to equalise signals received from the users and to operate according to: wherein {tilde over (G)} s is the equaliser, M is the total number of users, σ m,i 2 denotes a signal power of an ith transmitted block of a signal received from a mth user, F is the Fast Fourier Transform (FFT) matrix, F −1 is Inverse Fast Fourier Transform (IFFT) matrix, m is the P×P circulant matrix with its first column containing time domain channel taps of the mth user, where P is a block length, σ v 2 is the noise variance, I is the P×P identity matrix and W denotes a P×P matrix allowing to take into account Multi-User Interference (MUI) and Inter-Block Interference (IBI) due to the asynchronous reception among the users; wherein: wherein: D N N σ A Δ L is the channel length; τ τ L h c