政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/24855
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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/24855


    Title: A New Defined Lower Bit Rate AMR Mode in GSM and WCDMA Networks
    Authors: Guo Yifeng;Kuo Guomei;郭更生
    Contributors: IEEE
    Date: 2007-04
    Issue Date: 2009-01-14 16:39:20 (UTC+8)
    Abstract: Adaptive multi-rate (AMR) codec can adaptively select one of eight modes according to the channel condition or the system load. AMR allows making a trade-off between voice capacity and the voice quality. In GSM networks, when the channel condition is worse than the threshold, the voice quality is unacceptable even using the lowest rate mode (4.75 kbps). In this paper, by compressing the AMR frame, a new defined lower bit rate AMR mode with 3.95 kbps is proposed to guarantee the voice quality in this case. The proposed mode is completely compatible with the specified AMR codec in standard. Moreover, this mode can be adopted in WCDMA networks. Compared with 12.2 kbps mode, this new one can increase the capacity by 135% and increase the coverage gain by 2.6 dB.
    Relation: 2007-Spring IEEE Vehicular Technology Conference
    Data Type: conference
    DOI link: http://dx.doi.org/10.1109/VETECS.2007.159
    DOI: 10.1109/VETECS.2007.159
    Appears in Collections:[Department of Business Administation] Proceedings

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