Co-channel interference mitigation in the time-scale domain: the CIMTS algorithm

In many communication systems, the problem of co-channel interference is encountered when along with the signal of interest (SOI), and one or more interfering signals are present in a common receiver. The SOI and the interference are correlated, possess similar characteristics and power, and share the same region of support both in the time and frequency domains. In this paper, we present co-channel interference mitigation in the time-scale domain (CIMTS) algorithm (for MPSK signals) which estimates the SOI and the interfering signal from their superposition in the presence of additive noise. This method is inspired by the reconstruction of interference from the null space of the SOI in the time-scale domain. Once the null space of the SOI is determined, the interfering signal is reconstructed via a set of linear operations. Therefore, the SOI is estimated by a simple subtraction of the estimated interference from the observations.

[1]  Chrysostomos L. Nikias,et al.  Receivers with improved performance in the presence of co-channel interference based on the wavelet transform , 1994, Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers.

[2]  Truong Q. Nguyen.  Partial spectrum reconstruction using digital filter banks , 1993, IEEE Trans. Signal Process..

[3]  John G. Proakis,et al.  Digital Communications , 1983 .

[4]  Deepen Sinha,et al.  Low bit rate transparent audio compression using adapted wavelets , 1993, IEEE Trans. Signal Process..

[5]  Ingrid Daubechies,et al.  Ten Lectures on Wavelets , 1992 .

[6]  M. J. Ready,et al.  Demodulation of cochannel FSK signals using joint maximum likelihood sequence estimation , 1993, Proceedings of 27th Asilomar Conference on Signals, Systems and Computers.

[7]  Sergio Verdú,et al.  Minimum probability of error for asynchronous Gaussian multiple-access channels , 1986, IEEE Trans. Inf. Theory.

[8]  Peter Grant,et al.  Multirate signal processing , 1996 .

[9]  Chrysostomos L. Nikias,et al.  A new method for the design of high performance receivers in the presence of co-channel interference , 1994, Proceedings of IEEE-SP International Symposium on Time- Frequency and Time-Scale Analysis.

[10]  Behnaam Aazhang,et al.  Multistage detection in asynchronous code-division multiple-access communications , 1990, IEEE Trans. Commun..

[11]  Srinath Hosur,et al.  Recent progress in the application of wavelets in surveillance systems , 1994 .

[12]  Simon Haykin,et al.  Adaptive filter theory (2nd ed.) , 1991 .

[13]  K. Abend,et al.  Statistical detection for communication channels with intersymbol interference , 1970 .

[14]  H. W. Hawkes.  Study of adjacent and co-channel FM interference reduction , 1991 .