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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chih-Cheng Kuo Wern Ho Sheen Chung-Ju Chang Chang Lung Hsiao |
| Copyright Year | 2006 |
| Description | Author affiliation: Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu (Chih-Cheng Kuo; Wern Ho Sheen; Chung-Ju Chang; Chang Lung Hsiao) |
| Abstract | Transmitter-based signal pre-processing is investigated for the two-dimensional (2-D) OFDM-CDMA (orthogonal frequency division multiplexing, code division multiple access) forward link systems, aiming to increase the system sum-capacity and shift the signal processing complexity of a mobile unit to the base station. For the non-selective fading channels, the optimum pre-processing that achieves the maximum ergodic sum-capacity is obtained by applying the principle of multi-user water filling under the condition of zero multiple access interference (MAI). For the selective fading channels, on the other hand, three sub-optimum methods including ZF (zero-forcing) with power normalization, MMSE (minimum mean square error), and the newly proposed ZF with multi-user water filling are investigated under the constraint of total transmit power. Numerical results show that: (i) The new pre-processing outperforms the traditional other two in terms of achievable sum-capacity, (ii) 2-D spreading pattern should be adapted to the channel conditions so as to minimize MAI and thus maximize the sum-capacity. In this regard, 2-D spreading has advantage over the 1-D one. (iii) The fewer the users scheduled at a time, the higher the system capacity; a result obtained from exploiting the multi-user diversity. |
| Starting Page | 1 |
| Ending Page | 5 |
| File Size | 793608 |
| Page Count | 5 |
| File Format | |
| ISBN | 1424400627 |
| DOI | 10.1109/VTCF.2006.135 |
| 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 | Multiple access interference Signal processing Fading Filling Two dimensional displays OFDM Multiaccess communication Base stations Mean square error methods Interference constraints |
| Content Type | Text |
| Resource Type | Article |
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