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Multiuser distortion management of layered video over resource limited downlink multicode-CDMA | IEEE Journals & Magazine | IEEE Xplore

Multiuser distortion management of layered video over resource limited downlink multicode-CDMA


Abstract:

Transmitting multiple real-time encoded videos to multiple users over wireless cellular networks is a key driving force for developing broadband technology. We propose a ...Show More

Abstract:

Transmitting multiple real-time encoded videos to multiple users over wireless cellular networks is a key driving force for developing broadband technology. We propose a new framework to transmit multiple users' video programs encoded by MPEG-4 FGS codec over downlink multicode CDMA networks in real time. The proposed framework jointly manages the rate adaptation of source and channel coding, CDMA code allocation, and power control. Subject to the limited system resources, such as the number of pseudo-random codes and the maximal power for CDMA transmission, we develop an adaptive scheme of distortion management to ensure baseline video quality for each user and further reduce the overall distortion received by all users. To efficiently utilize system resources, the proposed scheme maintains a balanced ratio between the power and code usages. We also investigate three special scenarios where demand, power, or code is limited, respectively. Compared with existing methods in the literature, the proposed algorithm can reduce the overall system's distortion by 14% to 26%. In the demand-limited case and the code-limited but power-unlimited case, the proposed scheme achieves the optimal solutions. In the power-limited but code-unlimited case, the proposed scheme has a performance very close to a performance upper bound
Published in: IEEE Transactions on Wireless Communications ( Volume: 5, Issue: 11, November 2006)
Page(s): 3056 - 3067
Date of Publication: 19 December 2006

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I. Introduction

OVER the past few decades, wireless communications and networking have experienced an unprecedented growth. Wireless networking has become ubiquitous owing to the great demand of pervasive mobile applications such as video transmission [1], [2]. Code Division Multiple Access (CDMA) is a promising technology used in the current wireless networks and widely adopted for 3G wireless networks. The challenges for transmitting compressed videos over CDMA in real time lie in several aspects. First, CDMA networks are interference limited, and there are limited radio resources such as the transmission power and the total number of pseudo-random codes. In order to accommodate a large number of users with acceptable received quality, one challenge for system design is how to optimally allocate these radio resources. Furthermore, the bit rate of compressed video can be highly bursty due to the difference in video contents and intra/inter coding modes. To achieve the desirable video quality, we need to adjust the system parameters, such as source coding and radio resource allocations, to each video stream dynamically.

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References

References is not available for this document.