標題: | Chip interleaving for performance improvement of coded DS-CDMA systems in Rayleigh fading channels |
作者: | Lin, YN Lin, DW 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
公開日期: | 2003 |
摘要: | In mobile wireless communication, signal is usually subject to fading. Gain-combining diversity is a common remedy for fading effects. Practical channel coded direct-sequence code-division-multiple-access (DS-CDMA) uses bit interleaving to effect gain-combining time diversity through the redundancy provided by the channel code. Recently, some have proposed chip-interleaved DS-CDMA (CIDS-CDMA). Simple CIDS-CDMA considers a set of bits at a time. Similarly indexed chips in the bits are grouped together for transmission. Such interleaving has been shown to yield diversity gain in uncoded transmission. This paper considers the performance of CIDS-CDMA with channel coding. For simplicity, synchronous DS-CDMA is considered. In addition to simple CIDS-CDMA, we also consider combined bit-and-chip interleaving (BODS-CDMA). We present theoretical analysis and simulation results for both cases under long-code and short-code spreading. It is concluded that the code period is vital for simple CIDS-CDMA but is of no importance for BCIDS-CDMA. Another conclusion is that BCIDS-CDMA yields the best performance for it provides the largest diversity gain. |
URI: | http://hdl.handle.net/11536/18507 |
ISBN: | 0-7803-7954-3 |
ISSN: | 1090-3038 |
期刊: | 2003 IEEE 58TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS1-5, PROCEEDINGS |
起始頁: | 1323 |
結束頁: | 1327 |
顯示於類別: | 會議論文 |