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- W2176137989 abstract "The performance of an adjustable source/channel codec in a cellular mobile-radio environment is investigated. The speech transmission rate and the amount of forward error correction change in response to changing channel conditions. The channel rate is constant at 32 kb/s, and when the channel is good all of these bits are used for speech transmission. In intermediate and poor channels the speech rate is 24 or 16 kb/s, and the remaining channel symbols are used for forward error correction. Relative to conventional transmission this approach offers an improved grade of service. For example, the outage rate (the proportion of poor or worse communications) goes from nine percent with fixed-rate to three percent with variable-rate transmission. Alternatively, this improved grade of service can be exchanged for higher bandwidth efficiency. The fixed-rate system (with nine percent outage) has 23 users per cell. With 52 users per cell the outage of the variable-rate system is only six percent." @default.
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- W2176137989 date "1983-08-01" @default.
- W2176137989 modified "2023-09-25" @default.
- W2176137989 title "Quality of service and bandwidth efficiency of cellular mobile radio with variable bit-rate speech transmission" @default.
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- W2176137989 doi "https://doi.org/10.1109/t-vt.1983.23965" @default.
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