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Capture Probabilities in Random Access Mobile Communications in the Presence of Rician Fading
 IEEE Trans. on Veh. Tech
, 1997
"... In this paper, the capture probabilities, Cn , defined as the probability that any of n contending packets is correctly received, are found, with reference to a random access mobile radio communications system, in the presence of fading, shadowing, and near/far effect. A Rician model for fading, whi ..."
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In this paper, the capture probabilities, Cn , defined as the probability that any of n contending packets is correctly received, are found, with reference to a random access mobile radio communications system, in the presence of fading, shadowing, and near/far effect. A Rician model for fading, which is more general than the wellstudied Rayleigh fading, is considered. The capture probabilities are computed, and their dependence on the system parameters, and in particular on the Rice factor, K, is investigated. As an example of application, a Slotted ALOHA system is considered and the performance of a simple control strategy is studied. Also, some analytical results are given as to the value of C1 = limn!1 Cn , which is relevant to the study of the system stability. I. INTRODUCTION One of the many currently envisioned wireless applications is in local area communications, where a population of users share a common receiver which is centrally located [1]. This multiple access proble...
Combined Effect of Random Transmit Power Control And InterPath Interference Cancellation on DSCDMA Packet Mobile Communications
"... Abstract — In mobile communication systems, high speed packet data services are demanded. In the high speed data transmission, throughput degrades severely due to severe interpath interference (IPI). Recently, we proposed a random transmit power control (TPC) to increase the up link throughput of D ..."
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Abstract — In mobile communication systems, high speed packet data services are demanded. In the high speed data transmission, throughput degrades severely due to severe interpath interference (IPI). Recently, we proposed a random transmit power control (TPC) to increase the up link throughput of DSCDMA packet mobile communications. In this paper, we apply IPI cancellation in addition to the random TPC. We derive the numerical expression of the received signaltointerference plus noise power ratio (SINR) and introduce IPI cancellation factor. We also derive the numerical expression of system throughput when IPI is cancelled ideally to compare with the Monte Carlo numerically evaluated system throughput. Then we evaluate, by MonteCarlo numerical computation method, the combined effect of random TPC and IPI cancellation on the uplink throughput of DSCDMA packet mobile communications. Index Terms—IPI cancellation, random TPC, capture effect, packet, throughput IPI canceller and random TPC has not been fully theoretically discussed yet. In this paper, we derive the numerical expression of the received signaltointerference plus noise power ratio (SINR) and introduce IPI cancellation factor on DSCDMA packet mobile communications. We also derive the numerical expression of the average packet error rate and system throughput when IPI is cancelled ideally to compare with the Monte Carlo numerically evaluated system throughput. Then we evaluate the combined effect of IPI canceller and random TPC in the DSCDMA slotted Aloha. The remainder of this paper is organized as follows. Sect. II introduces random TPC and derives the system throughput. Sect. III derives the numerical expression of the received SINR and introduces IPI cancellation factor. Sect. IV derives the numerical expression of the average packet error rate and system throughput when IPI is cancelled ideally. Sect. V evaluates the throughput performance. Sect. VI gives some conclusions. I.
Chapter 2 Random Access Protocols for Wireless Personal Communications
"... This thesis is concerned with the ability of packet based random access protocols to operate in high capacity, interferencelimited wireless systems. In this chapter the concept of random access is described, with special regard given to the slotted ALOHA (SALOHA) and Packet Reservation Multiple Ac ..."
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This thesis is concerned with the ability of packet based random access protocols to operate in high capacity, interferencelimited wireless systems. In this chapter the concept of random access is described, with special regard given to the slotted ALOHA (SALOHA) and Packet Reservation Multiple Access (PRMA) protocols. The descriptions presented in this chapter
Transmit Power Control Using Probabilistic Target for DSCDMA Packet Mobile Radio
"... A new transmit power control (TPC) is proposed that changes TPC target randomly in order to obtain the capture effect for DSCDMA packet mobile radio. The uplink capacity of a DSCDMA packet mobile radio system with proposed random TPC in a frequency selective fading channel is evaluated by computer ..."
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A new transmit power control (TPC) is proposed that changes TPC target randomly in order to obtain the capture effect for DSCDMA packet mobile radio. The uplink capacity of a DSCDMA packet mobile radio system with proposed random TPC in a frequency selective fading channel is evaluated by computer simulation. The simulation results show that random TPC provides larger link capacity than with slow TPC irrespective of the number of propagation paths.
Combined Effect of InterPath Interference Cancellation And Random Transmit Power Control on DSCDMA Packet Mobile Communications
"... Abstract — In mobile communication systems, high speed packet data services are demanded. In the high speed data transmission, throughput degrades severely due to severe interpath interference (IPI). Recently, we proposed a random transmit power control (TPC) to increase the up link throughput of D ..."
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Abstract — In mobile communication systems, high speed packet data services are demanded. In the high speed data transmission, throughput degrades severely due to severe interpath interference (IPI). Recently, we proposed a random transmit power control (TPC) to increase the up link throughput of DSCDMA packet mobile communications. In this paper, we apply IPI cancellation in addition to the random TPC. We derive the numerical expression of the received signaltointerference plus noise power ratio (SINR) and introduce IPI cancellation factor. Then we evaluate, by MonteCarlo numerical computation method, the combined effect of random TPC and IPI cancellation on the uplink throughput of DSCDMA packet mobile communications. Keywordscomponent; IPI cancellation, random TPC, capture effect, packet, throughput The remainder of this paper is organized as follows. Sect. II introduces random TPC and derives the system throughput. Sect. III derives the numerical expression of the received signaltointerference plus noise power ratio (SINR) and introduces IPI cancellation factor. Sect. IV evaluates the throughput performance. Sect. V gives some conclusions. II. RANDOM TPC AND SYSTEM THROUGHPUT Fig.1 shows the probability density function (pdf) of the received signal power for the random TPC and the fast TPC. With the random TPC, the transmit power is controlled so that the signal power received at the base station becomes Ptarget ± Δ dB with a probability of ε ± (ε++ε−=1). I.