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In recent years, M2M (machine to machine) communications has increasingly been seen as a new growth area for wide-area wireless technologies which were designed for voice and high-speed packet data applications. In this paper, we use simulations to estimate the capacity of M2M applications over one of the widely used 3G wireless systems, CDMA2000 1x. We present capacity estimates of the CDMA2000 1x...
We propose an accurate, computationally efficient numerical model for noise mitigation in SAC-OCDMA. We validate our results with previously reported experimental results, and probe via simulation the limits of this noise suppression technique.
In cellular wireless communication systems, there have been various receiver-based techniques for performance improvement. However, it may be desirable to use transmitter- based techniques to improve the down-link capacity, since the implementation complexity is less critical at a base station (BS) than at a mobile station (MS). This paper presents a transmitter- based processing for the down-link...
In this paper the performance of the ESPAR (electronically steerable passive array radiator) antenna in suppressing both the co-channel and inter-symbol interferences is compared with the conventional circular and linear arrays. For this purpose, the STAP (space-time adaptive processing) is implemented in both arrays with equal elements. Simulation results show that when the pattern of the ESPAR antenna...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
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