TY - GEN
T1 - Interference mitigation in TDD fixed broadband wireless access using channel assignment and antenna arrays
AU - Ntagkounakis, Konstantinos E.
AU - Dallas, Panos I.
AU - Sharif, Bayan S.
PY - 2005
Y1 - 2005
N2 - In Time Division Duplex (TDD) Fixed Broad-band Wireless Access networks, co-channel interference that arises from the correlation of downlink and uplink signals in different sectors may considerably degrade the spectral efficiency. To overcome the complexity and costs of complete frame-TDD boundary synchronization in the network, a combined Channel Assignment (CA) and Antenna Array (AA) approach is proposed to mitigate interference. First a Rotated-Interleaved CA (RICA) scheme is applied, which exploits sector antenna directivity to reject the majority of interferers by receiving them through the antenna side and back lobes. Combined with RICA, an AA system is used in the base station side to further reduce intersector interference during both transmission and reception phases. For the worst-case interference scenario an Unsynchronized TDD scheme, the proposed methodology achieves a 51.5% improvement in the average channel capacity while it considerably improves the uplink availability. An advantage of this approach is that it considers only low-complexity AA system configurations, thereby optimizing the corresponding cost.
AB - In Time Division Duplex (TDD) Fixed Broad-band Wireless Access networks, co-channel interference that arises from the correlation of downlink and uplink signals in different sectors may considerably degrade the spectral efficiency. To overcome the complexity and costs of complete frame-TDD boundary synchronization in the network, a combined Channel Assignment (CA) and Antenna Array (AA) approach is proposed to mitigate interference. First a Rotated-Interleaved CA (RICA) scheme is applied, which exploits sector antenna directivity to reject the majority of interferers by receiving them through the antenna side and back lobes. Combined with RICA, an AA system is used in the base station side to further reduce intersector interference during both transmission and reception phases. For the worst-case interference scenario an Unsynchronized TDD scheme, the proposed methodology achieves a 51.5% improvement in the average channel capacity while it considerably improves the uplink availability. An advantage of this approach is that it considers only low-complexity AA system configurations, thereby optimizing the corresponding cost.
UR - http://www.scopus.com/inward/record.url?scp=34047141061&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:34047141061
SN - 3800729091
SN - 9783800729098
T3 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
SP - 1885
EP - 1889
BT - 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005
T2 - 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005
Y2 - 11 September 2005 through 14 September 2005
ER -