TY - GEN
T1 - First-ever report on MBWA system field trial
T2 - 68th Semi-Annual IEEE Vehicular Technology, VTC 2008-Fall, Conference
AU - Izuka, N.
AU - Asano, Y.
AU - Yamazaki, Y.
AU - Oguma, H.
AU - Kameda, S.
AU - Takagi, T.
AU - Tsubouchi, K.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - This paper discusses results of a MBWA system field trial with Fast Low-latency Access with Seamless Handoff Orthogonal Frequency Division Multiplexing (FLASH-OFDM). The results of the trial show that the downlink throughput performance is significantly impaired by inter-sector interference. To clarify the reasons of the impairment, we carry out a computer simulation on inter-sector interference reduction capability of frequency hopping orthogonal frequency division multiple access (FH-OFDMA), which is used as a multiple access scheme in FLASH-OFDM. The results are summarized as follows: (1) the interference reduction capability of FH-OFDMA is almost the same as that of direct sequence code division multiple access (DS-CDMA), which allocate the same frequency band to all sectors, and (2) in FH-OFDMA, a long hopping-pattern length yields no site diversity effect to reduce inter-sector interference. Additionally, a cumulative distribution of measured signal to noise and interference ratio (SNIR) shows that pilot signals in the neighboring sectors mainly impair the throughput performance. Since a sectored cell layout is mandatory for deployment of the MBWA systems in a high traffic area, inter-sector interference reduction is a key issue for these systems.
AB - This paper discusses results of a MBWA system field trial with Fast Low-latency Access with Seamless Handoff Orthogonal Frequency Division Multiplexing (FLASH-OFDM). The results of the trial show that the downlink throughput performance is significantly impaired by inter-sector interference. To clarify the reasons of the impairment, we carry out a computer simulation on inter-sector interference reduction capability of frequency hopping orthogonal frequency division multiple access (FH-OFDMA), which is used as a multiple access scheme in FLASH-OFDM. The results are summarized as follows: (1) the interference reduction capability of FH-OFDMA is almost the same as that of direct sequence code division multiple access (DS-CDMA), which allocate the same frequency band to all sectors, and (2) in FH-OFDMA, a long hopping-pattern length yields no site diversity effect to reduce inter-sector interference. Additionally, a cumulative distribution of measured signal to noise and interference ratio (SNIR) shows that pilot signals in the neighboring sectors mainly impair the throughput performance. Since a sectored cell layout is mandatory for deployment of the MBWA systems in a high traffic area, inter-sector interference reduction is a key issue for these systems.
KW - FH-OFDMA
KW - FLASH-OFDM
KW - Field trial
KW - Inter-sector interference
KW - MBWA
UR - http://www.scopus.com/inward/record.url?scp=58149114460&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=58149114460&partnerID=8YFLogxK
U2 - 10.1109/VETECF.2008.365
DO - 10.1109/VETECF.2008.365
M3 - Conference contribution
AN - SCOPUS:58149114460
SN - 9781424417223
T3 - IEEE Vehicular Technology Conference
BT - The 68th IEEE Vehicular Technology Conference, VTC 2008-Fall
Y2 - 21 September 2008 through 24 September 2008
ER -