| Analysis of Downlink Wideband DS-CDMA Systems with Smart Antenna for Different Spreading Bandwidths in Wideband Multipath Channel |
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Jun-Soo Jeon1, Cheol-Sung Kim2 |
1Information & Telecommunication Research Institute, Chonnam National University
2School of Electronics, Computer & Information Engineering, Chonnam National University |
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| Abstract |
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In this paper, the Eigen-RAKE receiver in wideband direct sequence code-division multiple access(DS-CDMA) systems with downlink smart antenna is analyzed for different spreading bandwidths(1.25 MHz, 5 MHz, 10 MHz) and different channel environments(macro, micro). The realistic spatio-temporal wideband multipath channel is assumed, one of which is standardized multiple-input single-output(MISO) radio channel model for WCDMA link-level simulations proposed by $3^{rd}$ generation partnership project(3GPP) contributions. We assumed spatial scattering phenomenon in which many unresolvable path signals within a limited range of spatial angle simultaneously contribute to the signals received at the receiver. Several multipaths within one chip are distinguished into each one and the first multipath components are selected as the desired signal and the others are considered self-interference. Downlink DS-CDMA system with eigenbeamformer using wider bandwidth present better performance than that using narrow bandwidth system by employing Eigen-RAKE receiver of many number of branches. It is shown that the downlink eigenbeamformer is more effective in typical urban macro cellular environments when using Eigen-RAKE receiver. |
| Key words:
Beamforming(BF), Direct Sequence Code-Division Multiple Access(DS-CDMA), Eigen-RAKE Receiver, Spreading Bandwidths |
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