Evaluation of coded CDMA with interference cancellation

• The performance of an asynchronous CDMA system (up-link) employing very low-rate maximum free distance codes for combined coding and spreading is analyzed when successive or parallel interference cancellation is applied. An analytical approach to the evaluation of the bit error rate is presented and shown to give results close to simulations. Our results show that the code-spread system outperforms the conventionally coded and spread system. Without interference cancellation the single-user bound is never reached (except for one user). With two stages of parallel interference cancellation, a code-spread system with a load only slightly less than 1 bit/chip can obtain a bit error rate very close to that of a single-user system.

Ämnesord

NATURVETENSKAP  -- Data- och informationsvetenskap (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences (hsv//eng)

Nyckelord

rate-compatible

parallel interference cancellation

successive interference cancellation

orthogonal codes

maximum free distance

low-rate convolutional codes

CDMA

Publikations- och innehållstyp

kon (ämneskategori)

ref (ämneskategori)