Abstract: An apparatus, such as a base station or a user equipment, includes a transceiver configured to receive a first signal that is a superposition of symbols transmitted concurrently by users in shared resources of an air interface. The apparatus also includes a processor configured to iteratively cancel, for the users, interference produced by the symbols transmitted by other users on the basis of log likelihood ratios (LLRs) that represent likelihoods that previous estimates of the symbols transmitted by the other users are correct. The processor is also configured to iteratively decode the symbols transmitted by the users after canceling the interference produced by the symbols transmitted by the other users.

Abstract: An apparatus, such as a base station or a user equipment, includes a transceiver configured to receive a first signal that is a superposition of symbols transmitted concurrently by users in shared resources of an air interface. The apparatus also includes a processor configured to iteratively cancel, for the users, interference produced by the symbols transmitted by other users on the basis of log likelihood ratios (LLRs) that represent likelihoods that previous estimates of the symbols transmitted by the other users are correct. The processor is also configured to iteratively decode the symbols transmitted by the users after canceling the interference produced by the symbols transmitted by the other users.

Abstract: Taps of a decision feedback equalizer (DFE) are stabilized by adding a small amount of noise to the feedback data symbols. In particular, a DFE structure comprises a feedforward filter, slicer, feedback filter and further includes a noise source. The noise source adds noise to the sliced data signal (provided by the slicer) before further processing by the feedback filter.

Abstract: In a first embodiment, a data transmitter according to the invention includes a digital-to-analog converter adapted to receive an input signal and produce a plurality of images therefrom, each image being displaced from the other images in frequency, and a compensation filter adapted to compensate at least one of the plurality of images to adjust for a loss inherent in the digital-to-analog converter. In an alternative embodiment, a receiver includes an analog-to-digital converter adapted to receive a line signal comprising a plurality of frequency diverse images, and to produce a sampled signal representative of a single image therefrom. In another alternative embodiment, a method of transmitting a signal includes the steps of creating a plurality of images of a main signal, compensating at least one of the images, and outputting the images.