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In this paper, Cognitive Radio CDMA networks have been modeled and performances of primary user (PU) and secondary user (SU) have been investigated. PUs communicate to BS in our assumed model. However, SUs form pair wise ad hoc networks to maximize their data rates. In the process, they may interfere heavily in uplink at the BS. An efficient signal strength based algorithm has been proposed for gradual...
In this paper, we propose a framework for analyzing downlink performance of cellular CDMA network without considering retransmission protocol in MAC layer. More specifically, we develop a simulation testbed for analyzing broadcast performance of WCDMA network in presence of both PHY layer and application layer forward error correction (FEC) codes only. In physical layer, low density parity check (LDPC)...
In this paper, the performance of a Cognitive Radio (CR) CDMA networks is analyzed in uplink. More precisely, we develop a simulation testbed for analyzing performances of a CR user and a primary user (PU) in a single cell. CR users belong to infrastructure less ad hoc network, which coexist with a primary radio network (PRN). CR users or secondary users (SUs) are considered to form pair wise links...
CDMA refers to multiple access method in which the individual terminals uses spread spectrum techniques and occupy the entire spectrum whenever they transmit. This feature makes CDMA different from FDMA and TDMA. In the wireless communication, the signal to interference ratio (SIR) and bit error rate (BER) are the predominant parameter that characterizes the system performance. This paper presented...
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