Method and apparatus for smart adaptive dynamic range multiuser detection radio receiver
A receiver includes multi-user detection (MUD) functionality and a cognitive engine. The receiver may also be coupled to multiple antennas and have analog beamforming capability. The cognitive engine is operative for selecting a beam or beams associated with the multiple antennas to enable successful demodulation by the MUD. The receiver has application in multiple access channels and in other communication scenarios.
1. A communication device for use in a multi-signal wireless environment having a signal of interest and one or more other signals in a common frequency band, the device comprising:
at least one beamformer configured to form a plurality of receive beams, each receive beam in the plurality of receive beams configured to receive a composite signal having a different combination of the signal of interest and the one or more other signals, wherein the at least one beamformer includes a linear combiner, having configurable combining weights, that is capable of achieving a variety of different receive beams when the combining weights are varied;
a multi-user detector (MUD) configured to demodulate the signal of interest within each composite signal;
a cognitive engine configured to select one or more receive beams in the plurality of receive beams that will result in a received power difference between the signal of interest and the one or more other signals that are delivered to the MUD, wherein the one or more receive beams are selected to optimize demodulation of the signal of interest in the MUD such that the MUD is able to process the signal of interest to produce a bit stream having a level of errors correctable by an error correction decoder in a receiver coupled to the MUD; and
a weight generation unit to generate weights for the linear combiner under control of the cognitive engine to achieve different receive beams.
2. The communication device of claim 1 , wherein the at least one beamformer comprises an analog beamformer or a digital beamformer.
3. The communication device of claim 1 , wherein the at least one beamformer includes multiple combiners that are each configured to linearly combine received signals, at least two of the multiple combiners linearly combining received signals differently.
4. The communication device of claim 3 , further comprising a beam selector switch coupled to outputs of the multiple combiners to select, under control of the cognitive engine, one or more of the beams generated by the multiple combiners for further receiver processing.
5. The communication device of claim 1 , further comprising a receive chain having an automatic gain controller or an analog to digital converter.
6. The communication device of claim 1 comprising one or more of: an integrated circuit, a handheld wireless communicator, a base station, a wireless access point, a femtocell unit for use in a cellular communication system, or a gateway unit for use in WiFi hotspots.
7. The communication device of claim 1 , wherein the at least one beamformer is capable to perform beamforming that is only coarse.