Short talks on Radio Propagation and Research in Cellular Networks
Kang Zhang, Biao He, Jackson Wang, Bathiya (ANU)
APPLIED SIGNAL PROCESSING SERIESDATE: 2011-10-28
TIME: 12:30:00 - 14:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
1) A Novel Tractable Framework to Analyse Heterogeneous Cellular Networks (Jackson Wang)
Heterogeneous cellular networks consisting of microcell, picocell, femtocell, distributed antennas and relays codeployed in space and frequency with carefully planned towermounted base stations, increase the complexity of the cellular network structure, which makes a tractable analysis model difficult to obtain. Since the traditional system-level simulation suffers from a computational complexity and being not tractable, recent research focused on using stochastic geometry to develop new general models for both single tier and heterogeneous cellular networks. In this paper, we propose a tractable model for downlink heterogeneous cellular network and based on that, the signal-to-interference-plus-noise ratio (SINR) distribution and accordingly the coverage (or equivalently outage) probability for a randomly located mobile user in this network can be derived. Compared to previous work, this new equivalent received power connectivity model takes the effects of different transmit powers and outage thresholds across tiers into consideration, thus making the analysis more accurate for noise-limited scenarios and extendable for a more general circumstance, such as the frequency reuse scenario.
2) Optimal Adaptive Uplink Attenuation Algorithms for WCDMA Femtocell (Jackson Wang)
Femtocells are assuming an increasing important role to extend the cellular network coverage and provide high speed data service for indoor environments. To cope with the extreme interfering cases in the WCDMA uplink scenario, Home NodeB (HNB) receivers need to employ uplink attenuation at the RF frontend to suppress the interfering signals introduced by unattached co-channel users, e.g., a penetrating signal from macro-connected users in the proximity. The optimal level of uplink attenuation at the HNB receiver should be designed to balance the requirements between the noise rise limitation in HNB and maximum transmit power cap for the femto-connected users. In this paper, we introduce two optimal adaptive schemes that apply the minimum and necessary level of attenuation to the received signal and show the outage probability improvement by the method of simulation.
3) Analysis of the Capacity Enhancement of Cellular Systems using Multiuser Receivers and Multiple Power Zones (Bathiya)
In this paper we show analytically how power allocated multi-user receivers in conjunction with power zones can be used to increase the capacity of CDMA cellular systems. The proposed scheme has two mutual benefits firstly, the increased sum-rate capacity of unequal power allocated multi user detection, and secondly we show that power zones can be used to significantly reduce intercell interference. Our results show that as the loading increases the benefits of power allocation and zoning increases as well. Our results show that using power allocation along with soft handover we can significantly increase the achievable cell loading over the conventional multi-user receivers.
BIO:
A set of short presentations for two final year students, plus practice talks for the upcoming Globecom Conference.
The time-table is
12:30 Kang Zhang: in-building RF simulation
12:45: Biao He: In building RF Simulation
1pm: Jackson Wang Globecom presentation 1
1:15 pm: Jackson Wang Globecom presentation 2
1:30 pm: Bathiya Globecom presentation 3
