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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)...
This paper evaluates the end-to-end performance of a CDMA based static multi-hop wireless sensor network (WSN) in shadowed environment with correlated interferers. Two different information delivery mechanisms are studied using regenerative relays with or without error correction capability. Optimal packet sizes, based on energy efficiency, are estimated for both schemes under several network conditions...
This paper evaluates the end-to-end outage probability of a CDMA based static multi-hop wireless sensor network (WSN) in shadowed environment. An interference model for multi-hop is presented considering correlation amongst interferers. Three different information delivery mechanisms are studied using regenerative relays with or without error correction capability. Outage probability for each mechanism...
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...
This paper evaluates the end-to-end performance of a CDMA based static multi-hop wireless sensor network (WSN) in shadowed environment. An interference model for multi-hop is presented using correlated interferers. Three different information delivery mechanisms are studied using regenerative relays with or without error correction capability. Energy requirement for successful delivery of a data packet...
The paper evaluates the performance of a CDMA based wireless sensor networks (WSN) with layered architecture in terms of energy consumption for successful transmission of data packets, considering only correlation among interferers in shadowed environment. We consider a model of interference at the sink for a layered architecture of CDMA based WSN with two kinds of interference, multiple access interference...
In this paper, a simulation study has been carried out to evaluate performance of joint admission and power control (JAPC) algorithms in Cognitive - CDMA Networks. Performance has been evaluated for SU in an uplink scenario of CDMA network consisting primary user (PU) and secondary user (SU). A numbers of algorithms have been investigated. Long term fading has been assumed in addition to path loss...
The paper evaluates the performance of a CDMA based wireless sensor networks (WSN) with layered architecture in terms of bit error rate (BER) and energy consumption for successful transmission of data packets. Correlation amongst signal and interferers in shadowed environment has been considered. Two kinds of interference namely multiple access interference (MAI) and node interference (NI) are considered...
The paper evaluates the performance of a CDMA based wireless sensor networks (WSN) in terms of outage probability and BER, considering correlation among interferers in shadowed environment. An appropriate model for the interference power, outage and BER are presented for a single hop communication. Detection probability is also evaluated in shadowed environment. The effects of node density, minimum...
The paper evaluates the performance of a CDMA based wireless sensor networks (WSN) in terms of packet error rate (PER) and energy consumption, considering correlation among interferers in shadowed environment. An appropriate model for the interference power, PER and average number of retransmission for successful delivery in a single hop communication are presented. An energy model is considered for...
Performance analysis of Multimedia Broadcast and Multicast Services (MBMS) in Cellular CDMA has been presented in this paper. Effects of soft handoff (HO) parameters have been analyzed on MBMS. Fountain code has been considered in the application layer for the broadcast services due to its rateless nature as well as to avoid a backward channel that may be needed when ARQ is used. Turbo code has been...
This paper investigates outage performance of different power allocation strategies for code division multiple access (CDMA) system. We proposed a simulation method for single-site power allocation algorithm, site selection diversity transmission (SSDT), and multi-site power allocation algorithms viz., link proportional power allocation (LPPA), equal power allocation (EPA). We have compared these...
Effects of soft handoff (HO) on forward link performance of packet data service have been presented in this paper. Outage of packet data transmission using code division multiple access (CDMA) is evaluated. Throughput and delay have also been investigated in cellular CDMA in presence of soft HO. Influence of physical layer issues like soft HO parameters, shadowing correlation, power control error...
Performance of a packetized data transmission in cellular CDMA is analyzed in presence of soft handoff and truncated power control. The combined effects of soft handoff parameters, truncated power control at physical layer and truncated ARQ at data link layer on throughput and delay performance of packet data under a prescribed delay constrain is studied. Truncated power control improves the performance...
Performance analysis of data services is studied in CDMA network in presence of beamforming and soft handoff (HO). Beamforming in conjunction with soft handoff is found to enhance throughput and reduce delay and BER significantly. A stop and wait ARQ scheme has been assumed. Both the cases of perfect and imperfect Beamforming are investigated. Effects of DoA (direction of arrival) estimation have...
This paper analyzes an adaptive processing gain based data transmission in cellular CDMA where processing gain is allocated depending on traffic intensity based on a constraint on bit error rate. Truncated automatic repeat request (T-ARQ) is used at link layer to satisfy a prescribed delay constraint. Effects of correlation among signal and interferers are included in the study. The impact of processing...
An adaptive data transmission scheme based on variable spreading gain (VSG) is studied in CDMA network in presence of soft handoff and space diversity. The processing gain is varied according to traffic intensity meeting a requirement on bit error rate (BER) at the output of a space diversity system provided by antenna array. Truncated automatic repeat request (T-ARQ) is used in link layer to further...
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