OFDM Code Division Multiplexing With Unequal Error Protection and Flexible Data Rate Adaptation


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Date: January 2008
Type: White Paper
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Overview: OFDM (orthogonal frequency division multiplexing) and OFDM-CDM (OFDM code division multiplexing) systems have proven to be robust in time-variant multipath fading channels. This paper investigates an OFDM-CDM system which can handle parallel data streams with different data rates and error protection by flexible adapting the symbol mapping scheme individually to each data stream. The proposed scheme offers an additional degree of freedom besides adaptive channel coding with variable code rates as applied in DAB [4], DVB-T, HIPERLAN/2 [5] or UMTS.

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