Sendfile (2) is a technique that avoids buffer copy overhead, and it directly pushes bits from the file system onto the network.

Sendfile(2)是一种避免缓冲区复制开销的技术，并且它直接将数据位从文件系统转移到网络。

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At the same time, if radio resource allocation is fully based on channel state information, these increase the needed number of feedback bits and lead to feedback overhead.

同时，如果无线资源分配基于完全信道信息反馈，将会增加系统的信息反馈量，造成较大的信息冗余。

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To get just 10 bits out of the sensor involves considerable data overhead (Figure 2).

为了从传感器获得的10位字节消耗了相当可观的数据开销(图2)。

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