Title :
Synchronous DS-SSMA system with improved decorrelating decision-feedback multiuser detection
Author :
Wei, Lei ; Schlegel, Christian
Author_Institution :
Signal Process. Res. Inst., Univ. South Australia, The Levels, SA, Australia
fDate :
8/1/1994 12:00:00 AM
Abstract :
An improved decorrelating decision-feedback multiuser detector (IDDFD) is proposed, whose complexity is linear in the number of users, but performs closely to the maximum likelihood detector (MLD), whose complexity grows exponentially with the number of users. The IDDFD also relaxes the requirement of correct power ordering which is essential to successfully cancel multiuser interference (MUI) for the standard decorrelating decision-feedback detector (DDFD). Simulation results show that in a direct-sequence spread-spectrum multiple-access (DS-SSMA) system using Gold codes of length 31 an IDDFD with only twice the complexity of the DDFD can simultaneously service 31 users with an error rate of each user close to the interference-free case. The IDDFD is then extended and studied to user numbers larger than the processing gain, complex signature waveforms, and MPSK signaling
Keywords :
codes; interference suppression; multi-access systems; phase shift keying; radiofrequency interference; signal detection; spread spectrum communication; Gold codes; MPSK signaling; code length; complex signature waveforms; decorrelating decision-feedback multiuser detection; direct-sequence spread-spectrum multiple-access; error rate; maximum likelihood detector; multiuser interference cancellation; power ordering; processing gain; simulation results; synchronous DS-SSMA system; Australia; Decorrelation; Detectors; Error analysis; Feedback; Interference cancellation; Maximum likelihood detection; Multiuser detection; Signal processing; Spread spectrum communication;
Journal_Title :
Vehicular Technology, IEEE Transactions on
