| 摘要 |
A communication system disclosed herein includes a channel quality estimation module that determines the channel quality metric utilizing the preamble portion of the packet only. Data, in such a communication system, is transmitted in the form of a packet over a data channel during a packet transmission, wherein each data channel includes several sub-channels. The system includes a receiver having a variable gain module and a baseband processor. The variable gain module applies variable gain to the received packets to ensure that the baseband processor receives sample signals of constant energy. The baseband processor, having several functions, couples to receive each baseband sample signal. Specifically, the baseband processor measures the power of the signal received and derives a variable gain control setting that is inversely proportional to the power of that signal. The baseband processor sends the variable gain control setting to the variable gain module when the baseband processor is processing the preamble of the packet to maintain a baseband signal of constant energy. Furthermore, the baseband processor calculates the gain estimation of the each sub-channel and calculates the noise-plus-interference power for each sub-channel. Moreover, the baseband processor generates a channel quality metric that is equivalent to the normalized geometric mean of the squared magnitudes of the gain estimation, divided by the total noise-plus-interference power.
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