Resource Allocation for Cooperative MIMO Relaying Systems
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
This master thesis compares cooperative MIMO relaying (CMIMOR) with a traditional one hop beamforming in a multi cell environment in terms of downlink capacity by means of simulation. One user and a group of relays form a Virtual Antenna Array (VAA), by letting the relays amplify and forward the information that is necessary for a MIMO link to be established between a macro base station and the VAA.
It has been shown that CMIMOR yields significant capacity gains in reference to a SISO connection on link level. CMIMOR systems have been studied for multi cell systems where the additional resources in terms of bandwidth, required by the relays, have been used inefficiently which yields lower capacities than obtained by the beamforming reference system. The inefficiently used resources leaves room for improvements.
To utilise the bandwidth resources better, by increasing the spatial reuse of a channel used by relays, a spatial reuse FDMA algorithm with power control (SP) is introduced in the CMIMOR system. In addition an algorithm that uses uncoordinated transmissions with maximum spatial reuse (UMSR) is introduced. The simulation results show that the capacity of the CMIMOR system is greater than the beamforming reference system if the selected relays are within the range of 20 to 40 meters from the user. The performance of the SP algorithm are shown the to be in between the performance of the beamforming and the UMSR algorithm. For a specific setup the performance of the UMSR algorithm is 300% better than that of the beamforming.
Place, publisher, year, edition, pages
2005. , 48 p.
Computer and Information Science
IdentifiersURN: urn:nbn:se:kth:diva-28059OAI: oai:DiVA.org:kth-28059DiVA: diva2:383889