32 results about "Multiuser detector" patented technology

A multi-user decoder is disclosed in which interfering users are assigned to levels of a decoding tree constructed in the decoder dependent on the power levels of the user's received signals and for each symbol interval. By building the decoding tree in this manner for each symbol interval, a reduced complexity search is more likely to include paths and nodes in the tree containing the correct value for the channel symbols.

A Tree-structured multicarrier multiple access communication system in a multiple access environment having a number of interfering signals. In one embodiment an environment estimator estimates and tracks the number of interfering signals of the environment. A code selector determines an optimal spreading code represented by the environment, and identifies an actual spreading code that is closest to the optimal spreading code. A signal transmitter can then be used to transmit a multicarrier multiple access signals in accordance with the actual spreading code identified. On the receiver side, a multiuser detector (MUD) module performs tree structured multiuser detection signal processing, and produces a bit stream for each interfering signal.

A space-time multiuser detector simultaneously reduces multiple access interference (MAI) and multipath channel distortion (MCD) that are disadvantages of mobile communication systems. The space-time multiuser detector includes a plurality of receiving antennas; a channel estimator which estimates signals received via the receiving antennas; a space-time diversity decoder which performs space-time decoding with respect to the signals provided from the channel estimator and performs diversity combination; a signal aligner which aligns the signals provided from the space-time diversity decoder; and a successive interference cancellation detector which generates an interference signal from the signals that are provided from the signal aligner one by one in sequence, and removes the interference signal from the received original signals.

The invention relates to a design method of a robust multi-user detector, which solves the technical problem of high bit error rate of the traditional multi-user detector under the impact noise channel environment, by initializing algorithm parameters; using the opposite learning method to initialize the parent population, and determining Three wolves in the parent population; use the improved gray wolf algorithm position update equation to update the parent population, and sort the population individuals according to the fitness value from large to small; use the parent population to generate offspring cross variants, when the child When the fitness value of the first-generation mutant is better than that of the parent population, the evolutionary direction of the offspring mutant individual and the information on the probability of successful cross-mutation are used for position information difference, and the new evolutionary direction information is obtained and saved, and the position of the three wolves is updated at the same time; Using Huber's theory and using the non-fast increasing function of the residual error to design the technical scheme of the multiuser detector under the impulsive noise channel, this problem is better solved, and it can be used in the design of the multiuser detector.