Title :
Influence of channel estimation on the performance of a coherent DS-CDMA system
Author :
Benthin, Marcus ; Kammeyer, Karl-Dirk
Author_Institution :
Blaupunkt Werke GmbH, Hildesheim, Germany
fDate :
5/1/1997 12:00:00 AM
Abstract :
Direct-sequence code division multiple access (DS-CDMA) has become one of the favourite candidates for future mobile radio communication systems. The uplink of a coherent DS-CDMA system is investigated. The channel estimation is carried out via a control channel, which is transmitted simultaneously to the data channel. This concept is very closely related to the CODIT-CDMA concept. In the channel estimation, an averaging process is involved, which for long averaging periods, suppresses the noise influence efficiently. On the other hand, long averaging intervals lead to systematic errors in the estimated channel coefficients due to the time-variant behavior of the channel. Taking into account these effects, a closed-form analysis of the data-channel symbol-error rate (SER) is presented. This analysis allows the prediction of the system´s performance and helps to optimize the parameter settings for channel estimation
Keywords :
Rayleigh channels; code division multiple access; coding errors; error statistics; interference suppression; land mobile radio; multipath channels; pseudonoise codes; radio links; radiofrequency interference; spread spectrum communication; telecommunication control; time-varying channels; CODIT-CDMA; L-path Rayleigh channel; averaging process; channel estimation; closed-form analysis; coherent DS-CDMA system; control channel; data channel; direct-sequence code division multiple access; estimated channel coefficients; long averaging intervals; mobile radio communication systems; noise suppression; parameter settings optimisation; symbol error rate; system performance; systematic errors; time-varying channel; uplink; Channel estimation; Closed-form solution; Data analysis; Land mobile radio; Multiaccess communication; Performance analysis; Proposals; Stochastic processes; System performance; System testing;
Journal_Title :
Vehicular Technology, IEEE Transactions on