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We design the new system, called sub-band hybrid optical CDMA/WDMA system, to achieve efficient power control, and consider that the error control codes can be used in our system. This approach can effectively reduce the bit error rate (BER), compared with that in the sub-band system without applying the error control codes. We also pay attention to the comparisons of the number of the combined users...
Recently, mobile communication system has been required to provide quality of service and multimedia service. Since the radio frequency spectrum is a precious resource, wireless radio networks need to make efficient use of it by providing high capacity for the system of interest. Time-domain and Frequency-domain spread MC DS-CDMA (TF-domain spread MC DS-CDMA) is a capacity improvement transmission...
Recently, mobile communication system has been required to provide quality of service and multimedia service. Since the radio frequency spectrum is a precious resource, wireless radio networks need to make efficient use of it by providing high capacity for the system of interest. Time-domain and Frequency-domain spread MC DS-CDMA (TF-domain spread MC DS-CDMA) is a capacity improvement transmission...
In real life the radio signals are subject to Rayleigh fading (fast fading) and interference. Power control is needed to compensate for these effects. This paper proposes a predictive inverse fast power control algorithm (PI-PCA) in DS-CDMA systems. Replacing the conventional power control schemes, this power control scheme controls the mobile's transmitted power based on the prediction of the fading...
In this paper, we proposed an optical code division multiple access (OCDMA) system with the position code to re-utilize the time slots wasted. We find that the performance of the new system will be better than that of original system. For example, it can accommodate at least 50 more users in the worst performance when BER is 10-9, and suppress the narrowband interference (NBI) caused by wavelength...
For optical communication networks, the wavelength division multiple access (WDMA) system has been developed at first and maturely commercialized. Although WDMA can be used to satisfy the requirement mentioned above, it has the disadvantage of low efficiency in utilizing bandwidth (for the high bandwidth optical communication system). Thus, the optical code division multiple access (OCDMA) is developed...
A hybrid OCDMA/WDMA system is further investigated. We propose an OCDMA receiver design to receive the desired signal with the least interference. Lower probability of error is obtained and better performance can be achieved
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