Adjacent channel interference suppression in FDMA/TDMA mobile radio systems using joint demodulation

The capacity and signal duality of wireless communications systems can be improved by enhancing receiver performance in the presence of adjacent channel interference (ACI). In this paper, an MLSE receiver for joint demodulation of adjacent channel signals is developed. This receiver provides significant improvement in performance over a wide range of carrier to interference ratios. A practical approach is taken, in which conventional down-conversion of each signal is performed followed by joint demodulation at baseband. To provide coherent reception, a novel form of joint channel estimation is used, exploiting knowledge of the transmit and receive filter responses. Receiver performance is evaluated via simulation for the GSM digital cellular system.

[1]  G. Ungerboeck,et al.  Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems , 1974, IEEE Trans. Commun..

[2]  W. van Etten,et al.  Maximum Likelihood Receiver for Multiple Channel Transmission Systems , 1976, IEEE Trans. Commun..

[3]  Gregory E. Bottomley,et al.  Jakes fading model revisited , 1993 .

[4]  Boon Chong Ng,et al.  A structured channel estimator for maximum-likelihood sequence detection , 1997, IEEE Communications Letters.

[5]  Pierre A. Laurent,et al.  Exact and Approximate Construction of Digital Phase Modulations by Superposition of Amplitude Modulated Pulses (AMP) , 1986, IEEE Trans. Commun..

[6]  S. Golestaneh,et al.  The effect of adjacent channel interference on the capacity of FDMA cellular systems , 1994 .

[7]  Sandeep Chennakeshu,et al.  Mobile-satellite systems: a perspective on technology and trends , 1996, Proceedings of Vehicular Technology Conference - VTC.

[8]  Gregory E. Bottomley,et al.  Improved channel estimation with side information , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[9]  Gregory E. Bottomley,et al.  Unification of MLSE receivers and extension to time-varying channels , 1998, IEEE Trans. Commun..

[10]  Peter Jung.  Laurent's representation of binary digital continuous phase modulated signals with modulation index 1/2 revisited , 1994, IEEE Trans. Commun..

[11]  Gregory E. Bottomley,et al.  Adaptive MLSE equalization forms for wireless communications , 1996 .

[12]  David D. Falconer,et al.  Suppression of adjacent-channel, cochannel, and intersymbol interference by equalizers and linear combiners , 1994, IEEE Trans. Commun..