Systems and methods for adaptive blind mode equalization

An adaptive communication receiver for the demodulation and detection of digitally modulated signals received over wireless communication channels exhibiting multipath and fading, the receiver comprising:

• an RF front end;
• an RF to complex baseband converter;
• a band limiting matched filter;
• a channel gain normalizer;
• a blind mode adaptive equalizer with hierarchical structure;
• an initial data segment recovery circuit;
• a differential decoder;
• a complex baseband to data bit mapper;
• and
• an error correction code decoder and de-interleaver

An adaptive digital beam former system for the demodulation and detection of digitally modulated signals in blind mode received over an antenna array of N elements, the system comprising:

• an RF front end for each of the N array elements;
• an RF to complex baseband converter for each of the N array elements;
• a weighted signal combiner with adaptive weights;
• a combiner gain normalizer;
• a decision device;
• and
• a multilevel adaptation subsystem for the adaptation of the combiner weights

A computer-implemented method for recovering the complex valued data symbols from the signal transmitted over time-varying dispersive wireless channels, the method comprising:

• receiving, by a computer device, the channel output signal, wherein the computer device comprises at least one processor and associated memory;
• implementing, by the computer device, a channel gain normalizer comprised of a channel signal power estimator, a channel gain estimator and a parameter cc estimator for providing nearly constant average power for the normalized output signal and for normalizing the channel with the dominant tap of the normalized channel adjusted to close to 1;
• implementing, by the computer device, a blind mode equalizer with hierarchical structure (BMAEHS) comprised of a level 1 adaptive system and a level 2 adaptive system for the equalization of the normalized channel output;
• and
• implementing, by the computer device, an initial data recovery circuit comprised of a quantizer, a memory, a fixed equalizer for recovering of the data symbols received during the initial convergence period of the BMAEHS and for pre appending the recovered symbols to the detected symbols at the output of the BMAEHS providing a continuous stream of all the detected symbols.

A receiver method comprised of receiving an input signal by an RF front end;

• and a computer-implemented method for adaptive demodulation and detection of digitally modulated signals received over wireless communication channels exhibiting multipath and fading, the computer-implemented method further comprising:
• conversion to baseband by an RF to complex baseband converter implemented by a computer device, wherein the computer device comprises at least one processor and associated memory;
• band limiting matched filtering by the computer device;
• normalizing channel gain by the computer device;
• implementing a blind mode adaptive equalizer with hierarchical structure (BMAEHS) by the computer device;
• recovering initial data segment, by the computer device, during the initial convergence period of the BMAEHS;
• differential decoding, by the computer device;
• complex baseband to data bit mapping, by the computer device;
• and
• error correction code decoding and de-interleaving, implemented by the computer device providing the detected information data at the output of the computer device.

An adaptive digital beam former method comprised of receiving RF source signal by an antenna array of N elements, N RF front end receiver blocks and a computer-implemented method for the demodulation and detection of digitally modulated signals in blind mode, the method comprised of:

• conversion to N baseband signals by N RF to complex baseband converters implemented by a computer device;
• combining N complex baseband signals by a combiner with adaptive weights implemented by a computer device;
• normalizing the combiner output by the combiner gain normalizer implemented by a computer device;
• detection of the data symbols with decision device implemented by a computer device;
• and
• implementing a multilevel adaptation subsystem for the adaptation of the combiner weights by a computer device.