Co-channel interference receiver
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorsMatthew A Taylor, Robert B MacLeod, Rachel E Learned, Joshua D Niedzwiecki, Karl D Brommer, Thomas P McElwain
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Abstract
A digital receiver automatically detects and non-coherently demodulates a multiplicity of interfering digitally modulated signals transmitted simultaneously at approximately the same carrier frequency. The receiver includes one or more antenna inputs (e.g., polarization and/or space diverse), a parameter estimator module, and a multiuser detector for estimating the data transmitted by each interfering signals and adapted to operate with at least one of a MUD algorithm with partially quantized prior information and a MUD algorithm based on prewhitened data.
Claims25
A co-channel interference receiver comprising:
- a multiuser detector module adapted to receive a complex signal that contains information from K co-channel interfering signals in the same frequency and time space, and configured to operate with at least one of a low complexity linear MMSE algorithm with partially quantized prior information and a low complexity M-algorithm based on prewhitened data;
- and
- a parameter estimation module adapted to receive the complex signal, and to generate estimated signature waveforms of each of the K co-channel interfering signals;
- wherein the estimated signature waveforms are provided to the multiuser detector thereby enabling demodulation of the K co-channel interfering signals.
A co-channel interference receiver comprising:
- a multiuser detector module adapted to receive a complex signal that contains information from K co-channel interfering signals, and configured to operates with at least one of a low complexity linear MMSE algorithm with partially quantized prior information and an algorithm based on prewhitened data, wherein said algorithm based on prewhitened data is selected from at least one of an M-algorithm and a T-algorithm;
- and
- a parameter estimation module adapted to receive the complex signal, and to generate estimated signature waveforms of each of the K co-channel interfering signals, wherein the estimated signature waveforms are provided to the multiuser detector thereby enabling demodulation of the K co-channel interfering signals.
A method for receiving a complex signal that contains information from K co-channel interfering signals, the method comprising:
- estimating signature waveforms of each of the K co-channel interfering signals;
- and
- processing the complex signal based on the signature waveforms with at least one of:
- a low complexity linear MMSE algorithm with partially quantized prior information, wherein the low complexity linear MMSE algorithm includes eliminating from each processing iteration consideration of those bits having an estimate value that exceeds a predetermined threshold, and wherein bit estimates exceeding the threshold are considered certain;
- and
- a low complexity M-algorithm based on prewhitened data.
Dependencies are inferred from the claim text.