Method for cancelling interference during tdma transmission and/or fdma transmission

Trellis-based approach and equalization method for the same digital transmission failure is assumed by the white Gaussian noise. A mobile communication or Fire-pair transmission, by interference failure often occurs, which must be considered in designing the receiver in order to prevent deterioration. Pre-it is possible to suppress the interference by filtering. The pre-equalization can be performed based - After processing, the disorder is similar, then the trellis and white noise with little variability. The pre-filter for, the new structure is improved compared to prior art has been proposed, where the complex values ​​of the complex pre-vector phase-filtering the projection is carried out. Thus, the pulse amplitude modulated by the real-valued data sequence being used, the channel impulse response is assumed to be totally different. The proposed method is used for both antenna diversity and a single receive. Sampling may be performed with the symbol frequency or interval. You can see that the proposed structure achieve excellent interference suppression. Free of the proposed structure are - in the filter, the feed-forward filter of a DFE with real-valued feedback filter is particularly suitable. Control of these filters may be performed by the LSM algorithm. Thus, the projection after the feedforward filter should be taken into account in the filter optimization. Finally, in accordance with the proposed structures in cooperation with the leveling of the future, there is a high-performance (low error rate is acceptable or low signal-to-interference ratio) as compared with the conventional can be obtained.