Successive interference cancellation with SISO decoding and EM channel estimation

We derive a low-complexity receiver scheme for joint multiuser decoding and parameter estimation of code division multiple access signals. The resulti ng receiver processes the users serially and iteratively, and makes use of soft-in soft-out single-user decoders, of soft interference cancellation an d of expectation-maximization parameter estimation as the main building blo cks. Computer simulations show that the proposed receiver achieves near single-u ser performance at very high channel load (number of users per chip) and ou tperforms conventional schemes with similar complexity.