Abstract: The disclosed system uses a less complex system of a single radio receiver-frontend with a phase-reconfigurable reflectarray and an antenna to form beams in directions of the desired arriving signals while forming nulls in directions of the arriving radio interference signals. This is done by configuring each reflector with an appropriate phase-shift state so that the amplification of the desired radio signals and the nulling of the undesired radio signals happen at the point all reflected radio signals combine at the antenna (before the receiver frontend). In comparison, a conventional digital receive array achieves beams and nulls by taking the sampled radio signal streams at the outputs of the receiver frontends, multiplies each sample stream by a digital weight to shift the stream's phase and/or amplitude and then combines the sample streams into one sample stream in which desired radio signals are amplified and undesired radio signals are attenuated.

Abstract: For multichannel multiuser detection in a wireless communication system such as a CDMA system, for a set of user spreading codes, coefficients to delay lines are adjusted and the delay line output processed to estimate a symbol. The symbol is estimated based on a space-time correlation for an antenna space delay time correlation. The estimated symbol is then remodulated and subtracted from the received antenna signal corresponding to other users of the wireless communication system. The adjusting and processing are iterated until the estimated symbols converge such that they correspond to a predetermined symbol decision criteria.