Cognitive Radio Networks appear as a probable solution for spectrum scarcity. However, establishing a balance between transmit power and interference in cognitive radio network is a challenging issue. In this paper, power allocation problem in cognitive radio is considered. Based on game theory, we modeled the problem into a repeated game with the purpose to minimize the total interference to the ...Show More
Orthogonal variable spreading factor (OVSF) codes are employed as channelization codes in wideband CDMA. The quantized rate handling feature of OVSF codes leads to wastage of capacity of OVSF codes reducing utilization and spectral efficiency of OVSF based systems. This paper presents a multi code assignment scheme for quantized and non quantized data rates to reduce code rate wastage. The multi c...Show More
In this paper a code assignment scheme called Next Code Precedence High (NCPH) is proposed for UTRA-FDD (universal terrestrial radio access frequency division duplex) systems based on OVSF (orthogonal variable spreading factor) channelization codes. Using the proposed scheme, the number of codes searched before finding suitable vacant code is least. Also the external code fragmentation which can l...Show More
