Abstract
In this work, we propose an iterative algorithm for the detection of transmitted symbols at the uplink of an orthogonal frequency-division multiple access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO)s from each user that cause multiple-access and self interference. The proposed algorithm squeezes the interference of subcarrier k into 2D + 1 nearby subcarriers by preprocessing the received signal and yields a banded structure interference matrix. Here, the value of D depends on the FO and determines the squeezing depth. The proposed algorithm exploits this banded structure and realizes a low complexity iterative soft-interference-cancellation minimum mean-squared error (SIC-MMSE) equalizer that can be used in Turbo equalization. Simulation results show that the bit-error-rate (BER) performance of the proposed algorithm outperforms existing detection algorithms and is very much close to the zero-FO frequency-domain-equalization (zero-FO-FDE).
| Original language | English (US) |
|---|---|
| Article number | 4801471 |
| Pages (from-to) | 1199-1205 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 8 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2009 |
| Externally published | Yes |
Keywords
- FOs synchronization
- Iterative detection
- OFDMA uplink
ASJC Scopus subject areas
- Applied Mathematics
- Electrical and Electronic Engineering
- Computer Science Applications