Adaptive nonuniform phase-shift-key modulation for multimedia traffic in wireless networks

Pursley, M.B.; Shea, John M.

doi:10.1109/49.864005

Cited by 89 publications

(46 citation statements)

References 14 publications

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“…Due to this capability of providing different levels of protection to the bits in the same message symbol, this type of constellations received a great deal of attention for many applications. Examples of these applications include, multimedia transmission [7] and downlink multiplexing [6] and simultaneous voice and multi-class data transmission [8]. In our previous work [6], we proposed a hierarchical scheme for downlink multiplexing which multiplexes information bits for different users in each symbol transmitted from the adaptive hierarchical modulator.…”

Section: Introductionmentioning

confidence: 99%

Multi-User Opportunistic Scheduling using Power Controlled Hierarchical Constellations

Hossain

Albuini

Bhargava

2007

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we study an application of hierarchical constellations (known also as embedded, multi-resolution, or asymmetrical constellations) for multi-user opportunistic scheduling. The key idea is to rely on hierarchical constellations to transmit information to two or more best users simultaneously in each transmission. The transmit power as well as the constellation parameters is changed according to the link qualities of the selected users in a way that a given target bit error rate (BER) is satisfied. We present the expressions for the average transmit power, the outage probability and the packet transmission probability with truncated channel inversion power control. Numerical examples show that, in an identical and independent fading condition, the proposed hierarchical constellation-based multi-user scheduling scheme offers higher frequency of channel access to the users at the expense of average transmission power compared to the classical opportunistic single user scheduling. The required additional power decreases as the number of users increases in the system. We also compare our proposed hierarchical constellation-based multi-user scheduling scheme with a uniform constellation-based time-slotted multi-user opportunistic scheduler. This comparison shows that although this time slotted system offers the same access probability as the hierarchical scheme, it requires more average transmit power than the newly proposed hierarchical scheme.

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Section: Introductionmentioning

confidence: 99%

Multi-User Opportunistic Scheduling using Power Controlled Hierarchical Constellations

Hossain

Albuini

Bhargava

2007

IEEE Trans. Wireless Commun.

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“…In [18], our co-author used the asymmetric PSK modulation to minimize the distortion in pulse-coded modulation signals. In [19][20], hierarchical modulations were investigated for multimedia applications. In [2][3], joint source-channel coding and hierarchical modulation techniques were employed to optimize the perceptual video quality.…”

Section: Related Researchmentioning

confidence: 99%

“…For example, in [21], the modulation asymmetry parameter α was chosen to be either 2 or 4 heuristically. In [19], the asymmetry parameter θ was chosen adaptively based on feedback from the receiver. This requires a real-time feedback channel from the receiver which may not always exist.…”

Section: Novelty Of the Proposed Approachmentioning

confidence: 99%

A Cross-Layer Unequal Error Protection Scheme for Prioritized H.264 Video using RCPC Codes and Hierarchical QAM

Chung

Kumar

Paluri³

et al. 2013

Journal of Information Processing Systems

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Abstract-We investigate the rate-compatible punctured convolutional (RCPC) codes concatenated with hierarchical QAM for designing a cross-layer unequal error protection scheme for H.264 coded sequences. We first divide the H.264 encoded video slices into three priority classes based on their relative importance. We investigate the system constraints and propose an optimization formulation to compute the optimal parameters of the proposed system for the given source significance information. An upper bound to the significance-weighted bit error rate in the proposed system is derived as a function of system parameters, including the code rate and geometry of the constellation. An example is given with design rules for H.264 video communications and 3.5-4 dB PSNR improvement over existing RCPC based techniques for AWGN wireless channels is shown through simulations.

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“…We define throughput as the number of payload bits per second received correctly as in [24]. We consider the contentionbased Distributed Coordination Function (DCF) for evaluating the throughput.…”

Section: Effect Of Payload Variation On Single-user Throughput In mentioning

confidence: 99%

Payload length and rate adaptation for multimedia communications in wireless LANs

Choudhury

Gibson

2007

IEEE J. Select. Areas Commun.

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Abstract-We provide a theoretical framework for cross-layer design in multimedia communications to optimize single-user throughput by selecting the transmitted bit rate and payload size as a function of channel conditions for both additive white Gaussian noise (AWGN) and Nakagami-m fading channels. Numerical results reveal that careful payload length adaptation significantly improves the throughput performance at low signal to noise ratios (SNRs), while at higher SNRs, rate adaptation with higher payload lengths provides better throughput performance. Since we are interested in multimedia applications, we do not allow retransmissions in order to minimize latency and to reduce congestion on the wireless link and we assume that packet loss concealment will be used to compensate for lost packets. We also investigate the throughput and packet error rate performance over multipath frequency selective fading channels for typical payload sizes used in voice and video applications. We explore the difference in link adaptation thresholds for these payload sizes using the Nafteli Chayat multipath fading channel model, and we present a link adaptation scheme to maximize the throughput subject to a packet error rate constraint.

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Adaptive nonuniform phase-shift-key modulation for multimedia traffic in wireless networks

Cited by 89 publications

References 14 publications

Multi-User Opportunistic Scheduling using Power Controlled Hierarchical Constellations

Multi-User Opportunistic Scheduling using Power Controlled Hierarchical Constellations

A Cross-Layer Unequal Error Protection Scheme for Prioritized H.264 Video using RCPC Codes and Hierarchical QAM

Payload length and rate adaptation for multimedia communications in wireless LANs

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