Iterative detection of chip interleaved CDMA systems in multipath channels

This study is concerned with iterative chip-by-chip multiuser detection for chip-interleaved code-division multiple-access (CDMA) systems in multipath channels. Different algorithms based on log-likelihood ratio combining (LLRC), maximal ratio combining (MRC) and joint Gaussian combining (JGC) are investigated and compared. It is shown that the LLRC approach provides a good trade-off between performance and complexity compared with the other two alternatives, achieving high throughputs with a complexity of O(L), where L is the tap number of the channel.