Estimation method of discrete digital signals in noisy overloaded wireless communication systems with CSI errors

A receiver of a communication system having a processor, volatile and/or non-volatile memory, at least one interface adapted to receive a signal in an communication channel, wherein the non-volatile memory stores computer program instructions which, when executed by the microprocessor, configure the receiver to implement reconstruction of discrete digital signals in noisy overloaded wireless communication systems with CSI errors that is characterized by a channel matrix of complex coefficients, by performing operations including:

• Receiving the signal from channel by a signal detector
• Estimation of the CSI error parameter t is done at the receiver
• Estimation noise power is done by a noise power estimator
• Forwarding the detected signal and the CSI error parameter τ and noise power estimation to a decoder that estimates the transmitted symbol(s),
• wherein the estimation of the decoder produces a symbol that could probably have been transmitted it is forwarded to a de-mapper, which outputs the bit estimates corresponding to the estimated transmit signal and the corresponding estimated symbol to a microprocessor for further processing, and
• wherein channel correlation is assumed to channel estimation error and the CSI error parameter τ is incorporated within the covariance matrix capturing this correlation.