Power level selection schemes to improve throughput and stability of slotted ALOHA under heavy load

Sarker, Jahangir H.; Hassan, Mahbub; Halme, Seppo J.

doi:10.1016/s0140-3664(02)00091-9

Cited by 22 publications

(10 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We also note that in the case of infinitely many nodes, retransmissions with a fixed positive probability renders the system unstable [8]. Finally, we should mention that there are also models in which not all packets involved in a collision are corrupted and lost, see [15] and references therein.…”

Section: Remarkmentioning

confidence: 91%

Slotted Aloha as a game with partial information

2004

View full text Add to dashboard Cite

This paper studies distributed choice of retransmission probabilities in slotted ALOHA. Both the cooperative team problem as well as the noncooperative game problem are considered. Unlike some previous work, we assume that mobiles do not know the number of backlogged packets at other nodes. A Markov chain analysis is used to obtain optimal and equilibrium retransmission probabilities and throughput. We then investigate the impact of adding retransmission costs (which may represent the disutility for power consumption) on the equilibrium and show how this pricing can be used to make the equilibrium throughput coincide with the optimal team throughput.

show abstract

Section: Remarkmentioning

confidence: 91%

Slotted Aloha as a game with partial information

2004

View full text Add to dashboard Cite

show abstract

“…The required power margin for various bit error rate is shown in table 4. Table 4 Power requirement to achieve bit error rate To achieve required BER Excess power margin required in DPSK in dB 10 Thus, if a system can achieve higher BER, then excess power margin required in DPSK is reduced [19] and in such cases DPSK can be tolerated compared to Coherent BPSK. This is shown in figure 5.…”

Section: Performance Metricsmentioning

confidence: 99%

A Plug and Play Module to identify type of Modulation

H.R¹,

K²,

S³

2017

IJET

View full text Add to dashboard Cite

-The main goal of this work is to identify the type of modulation in an independent manner with the use of plug and play module. As, some of the applications of SDR involve military and relief operation (non-cooperative relay environments), wireless data is sent using a suitable modulation technique to provide suboptimal and optimal receivers, savings in power for a required bit error rate etc. The constraints like limited available frequency bandwidth, time-varying multipath fading, shadowing and mobility are considered in this work.Efficient techniques to overcome these limitations involve adaptively changing the modulation mode based on the channel quality information sensed by the receiver and fed back to the transmitter to the throttling of the window size by the sender. The receiver should identify the type of modulation the transmitter has sent Keywords: DPSK, Adaptive modulation Introduction A wireless channel model can be considered both as a time-domain and frequency-domain channel with nonstationary and ergodic features. As a time-domain channel it is complex normal and independent across filter taps and users. Similarly in frequency-domain it has correlated channel gains across subcarriers. The general multidimensional linear channel model adequately represents a plethora of communication system models which utilize multidimensional transmit-receive signals for attaining increased rates and reliability in the presence of fading. Proposed method used to enhance feature extraction schemes, to optimize the number of feature vectors considered for identification and to combine deterministic and blind autonomous modulation identification schemes. The fundamental feature vectors are needed to be identified and used.

show abstract

“…When several packets are sent simultaneously, one of them can often be successfully received due to the power capture effect. We assume that the packet with the largest received power captures the channel [9], [6], [11]; if two or more packets are transmitted simultaneously with the same power, we assume that neither one of them can be captured. In addition to the power diversity which had already been proposed in [9], [6], [11] we consider differentiation between new packets and backlogged packets and allow for prioritization of one or the other in terms of transmitted power.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], power diversity is studied with the capture model that we use as well as with another capture model based on signal to noise ratio. [11] studies power diversity under three types of power distribution between the power levels and provides also stability analysis.…”

Section: Introductionmentioning

confidence: 99%

Slotted Aloha with Priorities and Random Power

Altman

Barman

Benslimane

et al. 2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

View full text Add to dashboard Cite

Abstract-This paper studies distributed choice of retransmission probabilities in slotted Aloha under power differentiation schemes. We consider random sets of possible transmission powers and further study the role of priorities (through power control) given either to new arriving packets or to backlogged packets. We study both the cooperative team problem in which a common objective is jointly optimized as well as the noncooperative game problem in which mobiles optimize individually their own objectives. We consider as objectives both maximizing throughputs as well as minimizing delays, and study the tradeoff between these objectives. We show that the new proposed schemes not only improve the average performances considerably but are also able in some cases to eliminate the bi-stable nature of the slotted Aloha.

show abstract

Power level selection schemes to improve throughput and stability of slotted ALOHA under heavy load

Cited by 22 publications

References 10 publications

Slotted Aloha as a game with partial information

Slotted Aloha as a game with partial information

A Plug and Play Module to identify type of Modulation

Slotted Aloha with Priorities and Random Power

Contact Info

Product

Resources

About