Title | Repeat Accumulate Code Division Multiple Access and its Hybrid Detection |
Authors | Rong Zhang and Lajos Hanzo |
Journal/Conference name | IEEE ICC 2008 International Conference on Communications |
Date of Publication | 19-23 May 2008 |
Work Area | Delivery Efficiency |
Abstract | In this paper, we propose the novel concept of Repeat Accumulate Code Division Multiple Access (RA-CDMA), which employs unique, user-specific channel code generator matrices (interleavers) for differentiating the users. We also suggest a Multilevel Structured (MLS) interleaver generation technique for the sake of reducing the memory storage requirements of our system and compare its correlation properties to those of the conventional random interleaver. A novel hybrid detector is designed for our system with the aid of EXtrinsic Information Transfer (EXIT) charts. Furthermore, we also design a low-complexity unequal power allocation scheme, assigning a different power to each user of this near-capacity transmission scheme. It is shown that when a sufficiently high interleaver length is employed, the RA-CDMA system is capable of approaching the Gaussian channel's capacity. |