... Network Assisted Power Control for Wireless Data DAVID GOODMAN Electrical Engineering, Polyte... more ... Network Assisted Power Control for Wireless Data DAVID GOODMAN Electrical Engineering, Polytechnic University, 6 Metrotech Center, Brooklyn, NY 11201, USA NARAYAN MANDAYAM WINLAB, Rutgers University, 73 Brett Road, Piscataway, NJ 08854, USA Abstract. ...
Ecient transmission of multimedia signals from energy limited portable devices requires a fresh l... more Ecient transmission of multimedia signals from energy limited portable devices requires a fresh look at the tradeos between source compression, channel cod- ing and transmission strategies. In this paper we pro- vide optimum operating points in terms of end-to-end source distortion and total energy consumption of the mobile due to compression, channel coding and trans- mission. We illustrate that the
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997
Page 1. INFOSTATIONS and : A New System Model for Data Messaging Services David J. Goodman, Joan ... more Page 1. INFOSTATIONS and : A New System Model for Data Messaging Services David J. Goodman, Joan Borr&s, Narayan B. Mandayam arid Roy D. Yates Wireless Information Network Laboratory (WINLAB) Rutgers University, PO Box 909 Piscataway, NJ 08855-0909 ...
In this preliminary study, we first show how a simple cellular automata (CA) model can be tailore... more In this preliminary study, we first show how a simple cellular automata (CA) model can be tailored to the context of radio communication. We then use the model to examine the tradeoff between mobility and radio communication. Within this context, one can view the presence of link (i,j) as an advantage in that it enables node i to send a packet on one hop to node j. However, it can also be a disadvantage in that, when node i broadcasts it causes interference at j. Thus, while the presence of a large number of links guarantees network connectivity, it brings with it the possibility of increased interference, which reduces the capacity of the network. Our analysis examines how in certain cases, mobility may add to the efficiency of practical networks, whereas in other situations, mobility may become a liability
In this paper we examine the aggregate throughput of the uplink of a circuit switched CDMA data t... more In this paper we examine the aggregate throughput of the uplink of a circuit switched CDMA data transmission system using a combination of theoretical and simulation techniques. The theoretical analysis determines the transmitter power levels and the number of active terminals that jointly maximize the throughput via standard optimization methods. We find that the terminal with the lowest path gain should transmit at maximum power and that all other terminals should aim for a common received power level that is higher than the received power from the terminal with lowest path gain. In addition we show that the system should admit the number of terminals that results in a target signal-to-interference-plus-noise ratio that depends on the processing gain and the noise power. A numerical example suggests that power control designed to achieve equal received power for all terminals results in aggregate throughput nearly as high as that obtained with optimum power control. This finding greatly simplifies the engineering problem from a network manager’s viewpoint.
Power control is a fundamental component of CDMA networks because of the interference that users ... more Power control is a fundamental component of CDMA networks because of the interference that users cause to one another. Consequently, too many users in the system may lead to an overload whereas too few would generate an inefficient use of resources. Previous work by the authors has highlighted some fundamental properties of a CDMA system pertaining to the required power distribution when a particular terminal has reached its power limit. These properties have formed the basis for an admission control scheme which leads to an efficient use of system resources. This paper expands on this scheme and shows that optimal throughput with a fixed number of users can be achieved for a range of received power values and that this range of values is affected by the geometry of the users' location relative to the base station. In addition, there is an optimal number of users and an optimal received power ratio between them that results in maximum throughput. But when the optimal conditions can not be achieved, it is known that equal received power has good performance, and based on this, we design an admission control algorithm.
IEEE Transactions on Circuits and Systems for Video Technology, 2000
Abstract In this work, we consider a CDMA cell with multiple terminals transmitting video signals... more Abstract In this work, we consider a CDMA cell with multiple terminals transmitting video signals. We adapt the system parameters to minimize the sum of compression powers and transmitter powers of all users while guaranteeing the received video quality at each terminal. The adjustable parameters at user i include the transmitter power P t, i, the video coding bit rate R s, i, and video encoder parameters that control the complexity and hence power consumption of the video coder (referred simply as complexity beta i). Instead of ...
... Network Assisted Power Control for Wireless Data DAVID GOODMAN Electrical Engineering, Polyte... more ... Network Assisted Power Control for Wireless Data DAVID GOODMAN Electrical Engineering, Polytechnic University, 6 Metrotech Center, Brooklyn, NY 11201, USA NARAYAN MANDAYAM WINLAB, Rutgers University, 73 Brett Road, Piscataway, NJ 08854, USA Abstract. ...
Ecient transmission of multimedia signals from energy limited portable devices requires a fresh l... more Ecient transmission of multimedia signals from energy limited portable devices requires a fresh look at the tradeos between source compression, channel cod- ing and transmission strategies. In this paper we pro- vide optimum operating points in terms of end-to-end source distortion and total energy consumption of the mobile due to compression, channel coding and trans- mission. We illustrate that the
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997
Page 1. INFOSTATIONS and : A New System Model for Data Messaging Services David J. Goodman, Joan ... more Page 1. INFOSTATIONS and : A New System Model for Data Messaging Services David J. Goodman, Joan Borr&s, Narayan B. Mandayam arid Roy D. Yates Wireless Information Network Laboratory (WINLAB) Rutgers University, PO Box 909 Piscataway, NJ 08855-0909 ...
In this preliminary study, we first show how a simple cellular automata (CA) model can be tailore... more In this preliminary study, we first show how a simple cellular automata (CA) model can be tailored to the context of radio communication. We then use the model to examine the tradeoff between mobility and radio communication. Within this context, one can view the presence of link (i,j) as an advantage in that it enables node i to send a packet on one hop to node j. However, it can also be a disadvantage in that, when node i broadcasts it causes interference at j. Thus, while the presence of a large number of links guarantees network connectivity, it brings with it the possibility of increased interference, which reduces the capacity of the network. Our analysis examines how in certain cases, mobility may add to the efficiency of practical networks, whereas in other situations, mobility may become a liability
In this paper we examine the aggregate throughput of the uplink of a circuit switched CDMA data t... more In this paper we examine the aggregate throughput of the uplink of a circuit switched CDMA data transmission system using a combination of theoretical and simulation techniques. The theoretical analysis determines the transmitter power levels and the number of active terminals that jointly maximize the throughput via standard optimization methods. We find that the terminal with the lowest path gain should transmit at maximum power and that all other terminals should aim for a common received power level that is higher than the received power from the terminal with lowest path gain. In addition we show that the system should admit the number of terminals that results in a target signal-to-interference-plus-noise ratio that depends on the processing gain and the noise power. A numerical example suggests that power control designed to achieve equal received power for all terminals results in aggregate throughput nearly as high as that obtained with optimum power control. This finding greatly simplifies the engineering problem from a network manager’s viewpoint.
Power control is a fundamental component of CDMA networks because of the interference that users ... more Power control is a fundamental component of CDMA networks because of the interference that users cause to one another. Consequently, too many users in the system may lead to an overload whereas too few would generate an inefficient use of resources. Previous work by the authors has highlighted some fundamental properties of a CDMA system pertaining to the required power distribution when a particular terminal has reached its power limit. These properties have formed the basis for an admission control scheme which leads to an efficient use of system resources. This paper expands on this scheme and shows that optimal throughput with a fixed number of users can be achieved for a range of received power values and that this range of values is affected by the geometry of the users' location relative to the base station. In addition, there is an optimal number of users and an optimal received power ratio between them that results in maximum throughput. But when the optimal conditions can not be achieved, it is known that equal received power has good performance, and based on this, we design an admission control algorithm.
IEEE Transactions on Circuits and Systems for Video Technology, 2000
Abstract In this work, we consider a CDMA cell with multiple terminals transmitting video signals... more Abstract In this work, we consider a CDMA cell with multiple terminals transmitting video signals. We adapt the system parameters to minimize the sum of compression powers and transmitter powers of all users while guaranteeing the received video quality at each terminal. The adjustable parameters at user i include the transmitter power P t, i, the video coding bit rate R s, i, and video encoder parameters that control the complexity and hence power consumption of the video coder (referred simply as complexity beta i). Instead of ...
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