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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Hamid, A. Hoshyar, R. Tafazolli, R. |
| Copyright Year | 2006 |
| Description | Author affiliation: Center for Commun. Syst. Res., Univ. of Surrey, Guildford (Hamid, A.; Hoshyar, R.; Tafazolli, R.) |
| Abstract | This paper studies adaptive power allocation among sub-carriers in MC-CDMA. Due to intrinsic nature of MC-CDMA; carrier based power allocation schemes cause MAI (multiple access interference) enhancements, hence fail at higher system loads. We propose a band based dynamic link adaptation (BBDLA) scheme that preserves orthogonality (among users) by spreading user's signal only over a band of adjacent N sub-carriers (N < Nsc) lying within coherence bandwidth $(B_{c})$ of the channel. Hence, it allows band based power allocation without causing any MAI. However, with only N orthogonal users supported on a particular band, BBDLA essentially proposes a hybrid of FDMA with MC-CDMA where Bands and transmit powers are optimally assigned to users by base station (in accordance with their channel state). Optimum band allocation for BBDLA is found to be computationally intractable hence a sub-optimal heuristic approach is proposed with equal power distribution among all assigned bands for each user. Effect of $B_{c}$ over choice of N is studied and BBDLA with suitably chosen N, is shown to outperform other published carrier based power allocation schemes while it maintain almost single user BER performance up to 62% of full system loading. |
| Starting Page | 1 |
| Ending Page | 5 |
| File Size | 178050 |
| Page Count | 5 |
| File Format | |
| ISBN | 1424400627 |
| DOI | 10.1109/VTCF.2006.171 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-09-25 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Multicarrier code division multiple access Multiple access interference Bandwidth Multiaccess communication OFDM Frequency diversity Bit error rate Interference elimination Transmitters Forward error correction |
| Content Type | Text |
| Resource Type | Article |
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