Coordinated Transmissions to Direct and Relayed Users in Wireless Cellular Systems

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

Research output: Contribution to journalConference article in JournalResearchpeer-review

14 Citations (Scopus)
399 Downloads (Pure)


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.
Original languageEnglish
Book seriesI E E E International Conference on Communications
Pages (from-to)1-5
Number of pages5
Publication statusPublished - 5 Jun 2011
EventIEEE International Conference on Communications (ICC) - Kyoto, Japan
Duration: 5 Jun 20119 Jun 2011


ConferenceIEEE International Conference on Communications (ICC)


  • Cooperative communications
  • a priori information
  • interference cancelation
  • analog network coding
  • relaying


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