Coordinated Transmissions to Direct and Relayed Users in Wireless Cellular Systems

Chan Thai, Petar Popovski, Megumi Kaneko, Elisabeth De Carvalho

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14 Citationer (Scopus)
339 Downloads (Pure)

Abstrakt

The ideas of wireless network coding at the physical layer promise high throughput gains in wireless systems with relays and multi–way traffic flows. This gain can be ascribed to two principles: (1) joint transmission of multiple communication flows and (2) usage of a priori information to cancel the interference. In this paper we use these principles to devise new
transmission schemes in wireless cellular systems that feature both users served directly by the base stations (direct users) and users served through relays (relayed users). We present four different schemes for coordinated transmission of uplink and downlink traffic in which one direct and one relayed user are served. These schemes are then used as building blocks in multi–user scenarios, where we present several schemes for scheduling pairs of users for coordinated transmissions. The optimal scheme involves exhaustive search of the best user pair in terms of overall rate. We propose several suboptimal scheduling schemes, which perform closely to the optimal scheme. The numerical results show a substantial increase in the system–level rate with respect to the systems with non–coordinated transmissions.
OriginalsprogEngelsk
BogserieI E E E International Conference on Communications
Sider (fra-til)1-5
Antal sider5
ISSN1550-3607
DOI
StatusUdgivet - 5 jun. 2011
BegivenhedIEEE International Conference on Communications (ICC) - Kyoto, Japan
Varighed: 5 jun. 20119 jun. 2011

Konference

KonferenceIEEE International Conference on Communications (ICC)
LandJapan
ByKyoto
Periode05/06/201109/06/2011

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