Jin Kyeom Kim’s research while affiliated with Ajou University and other places

We investigate some implementation factors that affect the performance of interference cancellers for the International Mobile Telecommunications-2000 (IMT-2000) 3^rd-generation partnership project (3GPP) system. We consider the multi-rate parallel interference canceller (PIC) that can remove effectively multiple access interference (MAI) through block-based detection and sample-based cancellation in asynchronous user environments. We evaluate the receiver complexities of the PIC receivers employing the advanced removal scheme. The proposed structure has significantly lower complexity as compared with that of the existing schemes. We analyze the effects of timing error, oversampling rate, unsynchronized users and/or outer-cell interference, and quantization error on the PIC performance through extensive computer simulations. The models for such factors and the optimum parameters are drawn.

We propose a block-based multi-rate parallel interference canceller (PIC) for the International Mobile Telecommunications-2000 (IMT-2000) 3rd-Generation Partnership Project (3GPP) system. It removes effectively multiple access interference (MAI) due to multiple users with different rates through block-based cancellation. For an asynchronous channel, we propose an advance removal scheme that removes in advance MAI due to the next block of other users with shorter delays. We also propose a pipeline structure that can remove MAI due to the next block without invoking extra hardware and/or computations. Computer simulations are performed to assess the performance of the proposed structure in terms of the bit error rate (BER) and the capacity