Channel adaptive transmission

Channel adaptive transmission

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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.

Chapter Contents:

  • 9.1 Adaptive transmission
  • 9.2 Rate adaptation
  • 9.2.1 Adaptive modulation
  • 9.2.2 Performance analysis over fading channels
  • 9.3 Power adaptation
  • 9.3.1 Full channel inversion
  • 9.3.2 Truncated channel inversion
  • 9.4 Joint power and rate adaptation
  • 9.5 Implementation issues
  • 9.6 Further readings
  • Problems
  • Bibliography

Inspec keywords: fading channels

Other keywords: channel power gain; channel adaptive wireless transmission; rate adaptation; channel adaptive transmission technique; fading effect; time-varying gain; highly-spectrum efficient-wireless transmission; guaranteed error rate performance; frequency flat fading channels; power adaptation; continuous power adaptation design; joint discrete rate; wireless fading channels

Subjects: Radio links and equipment

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