Adaptive Weighted Code Division Multiplexing(AW-CDM) Transmission System for Terrestrial Digital Television Broadcasting.

Hamazumi, Hiroyuki; Ito, Yasuhiro; Miyazawa, H.

doi:10.3169/itej1978.47.1367

Cited by 2 publications

(2 citation statements)

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“…Since the goal is to investigate how to distribute transmission energy among the different layers this paper uses QPSK signaling over orthogonal CDMA channels with only additive white Gaussian noise (AWGN) to simplify the analysis, similar to the concept used in [14]. To find the optimal energy distribution for an layer system with a total transmitter energy (denoted ) it is convenient to let denote the energy portion used for layer , for , then with and…”

Section: B Distribution/signalingmentioning

confidence: 99%

A Computability Strategy for Optimization of Multiresolution Broadcast Systems: A Layered Energy Distribution Approach

Sehlstedt

LeBlanc

2006

IEEE Trans. on Broadcast.

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Abstract-This paper investigates the possible system gain for a multiresolution broadcast system using multilayer transmission of multiresolution data by utilizing nonuniform layer transmission energies. It shows how to find the energy distribution that maximizes the system performance, measured in the form of a sum of a weighted layer values population product (representing possible revenue for service providers).Through the introduction of the relative population coverage function ( ) it is shown for a layer system that in many cases when ( ) is a concave function (equivalent to ( ) being convex) it is possible to reduce what seems to be an -dimensional problem to line searches. The paper also shows how the relative population coverage function can be constructed in two ways. The first uses analytic models for signal strength and population coverage (Uniform and Rayleigh). The second uses numerical signal strength and population estimates in grid format.The paper also includes examples to illustrate how the method works and the performance gain it provides. One of the examples uses actual grid estimates for an example transmitter located in Luleå, Sweden.

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Section: B Distribution/signalingmentioning

confidence: 99%

A Computability Strategy for Optimization of Multiresolution Broadcast Systems: A Layered Energy Distribution Approach

Sehlstedt

LeBlanc

2006

IEEE Trans. on Broadcast.

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“…The AW-CDM hierarchical digital transmission system for terrestrial digital broadcasting can easily achieve a graceful degradation by power controlled SS multiplexing[5] [6]. Although specific requirements regarding hierarchical transmission, such as the number of layers and the quality and strength of each layer, have not yet to be clarified, the AW-CDM system can flexibly satisfjl various requirements.…”

Section: Ss Application For Terrestrtal Digital Broadcastingmentioning

confidence: 99%

Trial application of spread spectrum technologies to hierarchical digital broadcasting

Hamazumi

Ito²,

Shogen³

et al.

Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications

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This paper describes two advanced hierarchical digital transmission systems using SS (spread spectrum) technology in order to improve the breakdown characteristics of digital transmission. One is AW-CDM (Adaptively Weighted Code Division Multiplexing) hierarchical digital transmission system for terrestrial digital broadcasting, which enables one to use mobile/portable receiver as well as fixed receiver. The other is TDM-SS (Time Division Multiplexing using Spread Spectrum) hierarchical digital transmission system for Ka-band satellite broadcasting, which enables one to receive limited but continuous service even in heavy rain attenuation. Through simulations and experiments using prototype models, some of their excellent features have been verified.

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Adaptive Weighted Code Division Multiplexing(AW-CDM) Transmission System for Terrestrial Digital Television Broadcasting.

Cited by 2 publications

References 0 publications

A Computability Strategy for Optimization of Multiresolution Broadcast Systems: A Layered Energy Distribution Approach

A Computability Strategy for Optimization of Multiresolution Broadcast Systems: A Layered Energy Distribution Approach

Trial application of spread spectrum technologies to hierarchical digital broadcasting

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