Abstract
The performance of a near-far-resistant, finite-complexity, minimum mean squared error (MMSE) linear detector for demodulating direct sequence (DS) code-division multiple access (CDMA) signals is studied, assuming that the users are assigned random signature sequences. We obtain tight upper and lower bounds on the expected near-far resistance of the MMSE detector, averaged over signature sequences and delays, as a function of the processing gain and the number of users. Since the MMSE detector is optimally near-far-resistant, these bounds apply to any multiuser detector that uses the same observation interval and sampling rate. The lower bound on near-far resistance implies that, even without power control, linear multiuser detection provides near-farresistant performance for a number of users that grows linearly with the processing gain.
Original language | English (US) |
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Pages (from-to) | 2039-2045 |
Number of pages | 7 |
Journal | IEEE Transactions on Information Theory |
Volume | 45 |
Issue number | 6 |
DOIs | |
State | Published - 1999 |
Keywords
- Cdma (code-division multiple access)
- Direct sequence
- Interference suppression
- Multiuser detection
- Random signature sequence
- Spread spectrum
ASJC Scopus subject areas
- Information Systems
- Computer Science Applications
- Library and Information Sciences