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As in-line interference between geostationary(GEO) and Non-Geostationary(NGEO) systems is becoming more and more serious. We propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for spectral coexistence of GEO and NGEO satellites to mitigate in-line interference. Results of Simulation show that the proposed scheme can improve the performance of the NGEO system in comparison...
A dense multi-hop wireless sensor network usually faces a scalability problem since the distance between cluster heads could be high, which causes relatively low throughput and high latency between the sink node and cluster heads. In this paper, we propose a heterogeneous structure for a dense WSN using IEEE 802.15.4 and IEEE 802.11 networks to increase throughput and reduce latency. However, since...
A dual-band bandpass filter using a transversal-interference multimode resonator is proposed. The resonator is composed of a flatten ring resonator attached with two open-circuited stubs. By properly selecting the connecting position between the stubs and a ring, the two pairs of resonant modes can be grouped to make up the dual-passband response, and they can be further separated with virtue of two...
Energy constrained devices, operating on short-range wireless networking standards such as IEEE802.15.4 and IEEE802.11x, are expected to be deployed for the IoT (Internet of Things) applications. However, co-located deployment of such devices based on different standards using the same 2.4 GHz license free Industrial, Scientific and Medical (ISM) spectrum, introduces coexistence issues, specifically...
We discuss the spectrum sensing problem which is crucial in opportunistic spectrum access. An In-band spectrum sensing method based on linear self-signal elimination is proposed. In this method, quiet period is not needed so that transmission performance can be improved without the interruption of on-going transmission. According to the AR model of the wireless fading channel, the adjacent symbols...
Sensing is one of the key technologies for the implementation of cognitive radio. The usual In-band sensing is performed during quiet period to avoid the interference from the network itself. In this paper, we proposed a novel In-band sensing method which can avoid the usage of quiet period to guarantee the performance of the network. In this method, the complementary of adjacent OFDM symbols is utilized...
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