標題: Overloaded Multiple Access Systems: A Generalized Model and A Low-complexity Multiuser Decoder
作者: Chang, Meng-Che
Su, Yu T.
傳播研究所
Institute of Communication Studies
公開日期: 2016
摘要: Several works have emerged in the past decade that can potentially provide higher spectral efficiency than that offered by existing orthogonal-channelization based air interfaces for a fixed bandwidth expansion factor. Among them, the interleave division multiple access (IDMA) and low-density spreading CDMA (LDS-CDMA) are of special interest because of their overloading capability. In this paper, we present a unified system structure that encompasses both systems. We call this unified structure as codeword interleaved LDS CDMA (cILDS-CDMA) and present an iterative decoding structure. We analyze the decoder performance via an EXIT-chart like approach and demonstrate the advantage of low density (sparse) spreading. Numerical results in AWGN channel show that LDS reduces the decoding latency and the cILDS-CDMA scheme also offer a larger diversity gain in frequency selective fading channels.
URI: http://hdl.handle.net/11536/136250
ISBN: 978-1-5090-3401-7
ISSN: 2165-4700
期刊: 2016 9TH INTERNATIONAL SYMPOSIUM ON TURBO CODES AND ITERATIVE INFORMATION PROCESSING (ISTC)
起始頁: 231
結束頁: 235
顯示於類別:會議論文