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As microwave spectrum becomes increasingly scarce, millimeter wave communication has gained wide attention for its sufficient bandwidth, which is also considered as one of the key technologies in the Fifth Generation (5G) communication networks. Different from microwave, millimeter communication is easy to suffer from the blockages. In order to take advantage of the wide spectrum and avoid the big...
Abstract-Heterogeneous deployment comprising overlays macrocell and small cells is a promising solution to enhance both system capacity and coverage. Nevertheless, the performance of heterogeneous networks uplink is severely degraded due by cross-layer interference, especially the interference that small cell suffers from the proximate macro UEs (MUEs). In this paper, we propose a Cross-Tier Interference-Aware...
Voltage comparators have been widely used in low-power sensor wake-up circuits for extracting digital bits from the envelope of received RF signals. This paper presents an alternative circuit to such comparators. The proposed circuit extracts digital bits by detecting the falling edge of the envelope signal. Since it essentially compares the values of the same signal at different times, it is potentially...
We investigate the resource-sharing problem of Device-to-Device (D2D) communications underlaying the cellular network. The performance of D2D communications sharing the u-plink channel of a cellular system is analyzed by first considering a single cell scenario for analytical tractability. Then we propose a position-based resource-sharing scheme for D2D communications underlying cellular system, and...
In this letter, we maximize the multicast capacity of a cellular system with dedicated decode-and-forward (DF) relays, by jointly optimizing transmission data rates of the base station (BS) and the relays subject to an average outage constraint in Rayleigh fading channels. The optimal transmission rates of the BS and relays and the optimal relay locations are obtained based on an outage probability...
In this paper, we present two novel ARQ schemes for mobile multicast, which utilize packet-combining to reduce the number of retransmissions. The spectral efficiency of these multicast ARQ schemes are optimized jointly with adaptive modulation and coding (AMC) under specific QoS constraints, and numerical results show that significantly gains can be achieved comparing to schemes without packet-combining...
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