Channel adaptive transmission
Wireless channel introduces a time-varying gain to the transmitted signal. The dynamic range of channel power gain can be as much as 30 dB due to the fading effect. Adaptive transmission can achieve high spectral and power efficiency with guaranteed error rate performance over wireless fading channels. As such, adaptive transmission becomes an essential technology to meet the increasing demand for highly spectrum efficient wireless transmission. This chapter studies channel adaptive transmission techniques over frequency flat fading channels. We first present the basic idea of channel adaptive wireless transmission. We then separately discuss two classes of adaptive transmission technologies, namely rate adaptation and power adaptation. A joint discrete rate and continuous power adaptation design is also presented together with several implementation issues associated with channel adaptive transmission.
Channel adaptive transmission, Page 1 of 2
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