Spreading Code Design for Downlink Space-Time-Frequency Spreading CDMA

@article{Liu2008SpreadingCD,
  title={Spreading Code Design for Downlink Space-Time-Frequency Spreading CDMA},
  author={Siyang Liu and Zhendong Luo and Yuanan Liu and Jinchun Gao},
  journal={IEEE Transactions on Vehicular Technology},
  year={2008},
  volume={57},
  pages={2933-2946}
}
In this paper, we analyze the recently proposed downlink space-time-frequency spreading code-division multiple-access (STFS-CDMA) scheme. A spreading code design criterion is first derived for STFS-CDMA. From the spreading code design criterion, we can see that the two original spreading codes adopted in STFS-CDMA, i.e., the Walsh-Hadamard code (WHC) and the double-orthogonal code (DOC), both cannot achieve full space and frequency diversity, no matter how many users exist in the system. Then… CONTINUE READING

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