Abstract
This paper investigates the optimum adaptive antenna array beam forming (AAA-BF) configuration considering the diversity effect provided by transmit diversity (TD) in a multipath fading channel in the W-CDMA forward link. Computer simulation results show that the required transmit signal energy per bit-to-background noise power spectrum density ratio (E b/N 0) at the average block error rate (BLER) of 10 -2 using AAA-BF coupled with TD is decreased by approximately 1.0 dB compared to that of AAA-BF assuming the identical number of total antennas when the capacity, i.e., the number of simultaneously accommodated users with the transmission power proportional to the symbol rate, normalized by processing gain, Pg, is below approximately 20%. However, we find that in an interference-limited channel, when the capacity normalized by Pg is above approximately 30%, AAA-BF employing all antennas accommodates a larger capacity compared to AAA-BF coupled with TD because of a sufficient interference suppression effect due to a much narrower beam width despite the absence of the antenna diversity effect. This paper also elucidates in a multi-cell model that AAA-BF employing all antennas can accommodate approximately 1.5 times more users with the average BLER of 10 -2 and with the outage probability of 5%, compared to the case with AAA-BF coupled with TD, when the total number of antennas is 8.
| Original language | English |
|---|---|
| Pages (from-to) | 1594-1603 |
| Number of pages | 10 |
| Journal | IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences |
| Volume | E85-A |
| Issue number | 7 |
| Publication status | Published - 2002 Jul |
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Keywords
- Adaptive antenna array beam forming
- Fast transmission power control
- Mobile radio
- Transmit diversity
- W-CDMA
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Hardware and Architecture
- Information Systems
Cite this
Evaluation of optimum adaptive antenna array beam forming configuration considering diversity effect in W-CDMA forward link. / Fukumoto, Satoru; Ihara, Taisuke; Sawahashi, Mamoru; Sasase, Iwao.
In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E85-A, No. 7, 07.2002, p. 1594-1603.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaluation of optimum adaptive antenna array beam forming configuration considering diversity effect in W-CDMA forward link
AU - Fukumoto, Satoru
AU - Ihara, Taisuke
AU - Sawahashi, Mamoru
AU - Sasase, Iwao
PY - 2002/7
Y1 - 2002/7
N2 - This paper investigates the optimum adaptive antenna array beam forming (AAA-BF) configuration considering the diversity effect provided by transmit diversity (TD) in a multipath fading channel in the W-CDMA forward link. Computer simulation results show that the required transmit signal energy per bit-to-background noise power spectrum density ratio (E b/N 0) at the average block error rate (BLER) of 10 -2 using AAA-BF coupled with TD is decreased by approximately 1.0 dB compared to that of AAA-BF assuming the identical number of total antennas when the capacity, i.e., the number of simultaneously accommodated users with the transmission power proportional to the symbol rate, normalized by processing gain, Pg, is below approximately 20%. However, we find that in an interference-limited channel, when the capacity normalized by Pg is above approximately 30%, AAA-BF employing all antennas accommodates a larger capacity compared to AAA-BF coupled with TD because of a sufficient interference suppression effect due to a much narrower beam width despite the absence of the antenna diversity effect. This paper also elucidates in a multi-cell model that AAA-BF employing all antennas can accommodate approximately 1.5 times more users with the average BLER of 10 -2 and with the outage probability of 5%, compared to the case with AAA-BF coupled with TD, when the total number of antennas is 8.
AB - This paper investigates the optimum adaptive antenna array beam forming (AAA-BF) configuration considering the diversity effect provided by transmit diversity (TD) in a multipath fading channel in the W-CDMA forward link. Computer simulation results show that the required transmit signal energy per bit-to-background noise power spectrum density ratio (E b/N 0) at the average block error rate (BLER) of 10 -2 using AAA-BF coupled with TD is decreased by approximately 1.0 dB compared to that of AAA-BF assuming the identical number of total antennas when the capacity, i.e., the number of simultaneously accommodated users with the transmission power proportional to the symbol rate, normalized by processing gain, Pg, is below approximately 20%. However, we find that in an interference-limited channel, when the capacity normalized by Pg is above approximately 30%, AAA-BF employing all antennas accommodates a larger capacity compared to AAA-BF coupled with TD because of a sufficient interference suppression effect due to a much narrower beam width despite the absence of the antenna diversity effect. This paper also elucidates in a multi-cell model that AAA-BF employing all antennas can accommodate approximately 1.5 times more users with the average BLER of 10 -2 and with the outage probability of 5%, compared to the case with AAA-BF coupled with TD, when the total number of antennas is 8.
KW - Adaptive antenna array beam forming
KW - Fast transmission power control
KW - Mobile radio
KW - Transmit diversity
KW - W-CDMA
UR - http://www.scopus.com/inward/record.url?scp=0036630488&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036630488&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0036630488
VL - E85-A
SP - 1594
EP - 1603
JO - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
JF - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
SN - 0916-8508
IS - 7
ER -