Sensitivity of OFDM-CDMA Systems to Carrier Frequency Offset

Sensitivity of OFDM-CDMA Systems to Carrier Frequency Offset

This paper presents the impact of a carrier frequency offset on the performance of 2 dimensional spreading OFDM-CDMA systems. This is measured by the degradation of the Signal to Interference plus Noise Ratio (SINR) obtained after despreading and equalization. Using some properties of random matrix...

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Bibliographic Details
Published in:2006 IEEE International Conference on Communications Vol. 10; pp. 4577 - 4582
Main Authors: Nasser, Youssef, Noes, Mathieu des, Ros, Laurent, Jourdain, Genevieve
Format: Conference Proceeding
Language:English
Published: IEEE 01-06-2006
Subjects:
Carrier offset
Degradation
Equalizers
Frequency synchronization
Interference
MC-CDMA
MC-DS-CDMA
Mean square error methods
Multiaccess communication
Multicarrier code division multiple access
OFDM
OFDM-CDMA
Signal to noise ratio
SINR
Transmitters
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Summary:This paper presents the impact of a carrier frequency offset on the performance of 2 dimensional spreading OFDM-CDMA systems. This is measured by the degradation of the Signal to Interference plus Noise Ratio (SINR) obtained after despreading and equalization. Using some properties of random matrix and free probability theories, a new expression of the SINR is derived. It is independent of the actual value of the spreading codes while still accounting for the orthogonality between codes. This model is validated by means of Monte-Carlo simulations. It is also exploited to compare the sensitivities of MC-CDMA and MC-DS-CDMA systems to carrier offset in a frequency selective channel. This work is carried out for zero forcing (ZF) and minimum mean square error (MMSE) equalizers.
ISSN:1550-3607
1938-1883
DOI:10.1109/ICC.2006.255361