Summary
|
For Full-Text PDF, please login, if you are a member of IEICE, or go to Pay Per View on menu list, if you are a nonmember of IEICE. |
|
DS-CDMA Downlink Site Diversity with Frequency-Domain Equalization and Antenna Diversity Reception Hirotaka SATO Hiromichi TOMEBA Kazuaki TAKEDA Fumiyuki ADACHI Publication IEICE TRANSACTIONS on Communications Vol.E90-B No.12 pp.3591-3597 Publication Date: 2007/12/01 Online ISSN: 1745-1345 DOI: 10.1093/ietcom/e90-b.12.3591 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: DS-CDMA, frequency-domain equalization, site diversity, link capacity, Full Text: PDF(835.7KB)>>
Summary: The use of frequency-domain equalization based on minimum mean square error criterion (called MMSE-FDE) can significantly improve the bit error rate (BER) performance of DS-CDMA signal transmission compared to the well-known coherent rake combining. However, in a DS-CDMA cellular system, as a mobile user moves away from a base station and approaches the cell edge, the received signal power gets weaker and the interference from other cells becomes stronger, thereby degrading the transmission performance. To improve the transmission performance of a user close to the cell edge, the well-known site diversity can be used in conjunction with FDE. In this paper, we consider DS-CDMA downlink site diversity with FDE. The MMSE site diversity combining weight is theoretically derived for joint FDE and antenna diversity reception and the downlink capacity is evaluated by computer simulation. It is shown that the larger downlink capacity can be achieved with FDE than with coherent rake combining. It is also shown that the DS-CDMA downlink capacity is almost the same as MC-CDMA downlink capacity. | |||||
|
|