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Clipping noise cancellation in uplink MC-CDMA system using signal reconstruction from non-uniform samples
Ali Hemmati, R ; Sharif University of Technology | 2008
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- Type of Document: Article
- DOI: 10.1109/ICTEL.2008.4652652
- Publisher: 2008
- Abstract:
- In this paper, an iterative signal reconstruction method is extended to cancel multi-user clipping noise in a uplink MC-CDMA systems. Clipping is the simplest method to overcome high peak-to-average power ratio of multi-carrier signals but it makes the multi-carrier signals distorted. Reconstruction methods use non-distorted samples to reconstruct distorted samples in the receiver but multi-user interference causes the methods do not work properly because all the received samples are distorted by clipping and interference and so there is no undistorted samples to be used in recovering clipped samples. On the other hand, multi-user interference cancellation methods do not work properly because clipping in the transmitter is a non-linear process and therefore this process increases the amount of multiple access interference (MAI). In this paper, we propose a joint MAI and clipping noise cancellation method. In the proposed method in each iteration a MC-CDMA detector is used for signal detection and then using non-uniform sampling (that forces known error positions due to clipping to be zero) and filtering process an error estimation is calculated and then canceled. Simulation results show that the proposed method improves the performance of clipped MC-CDMA systems in uplink. © 2008 IEEE
- Keywords:
- Clipping noise ; Error estimations ; Filtering process ; MC-CDMA ; MC-CDMA systems ; Multi-user ; Multi-user interference ; Multicarrier signal ; Nonlinear process ; Nonuniform ; Nonuniform sampling ; Peak to average power ratio ; Reconstruction method ; Simulation result ; Uplink MC-CDMA ; Code division multiple access ; Communication channels (information theory) ; Error detection ; Multicarrier modulation ; Network routing ; Radio interference ; Repair ; Semiconductor counters ; Signal analysis ; Signal processing ; Signal reconstruction ; Spurious signal noise ; Multiple access interference
- Source: 2008 International Conference on Telecommunications, ICT, St. Petersburg, 16 June 2008 through 19 June 2008 ; 2008 ; 9781424420360 (ISBN)
- URL: https://ieeexplore.ieee.org/document/4652652