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OFDMA uplink performance for interactive wireless broadcasting
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PRE
AI
DOI：10.1109/TBC.2005.851089.png)
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Abstract
En 中文
A combination of orthogonal frequency division multiplexing (OFDM) with frequency-division multiple access (FDMA) called OFDMA is regarded as a promising solution for improving the performance of interactive wireless broadcasting systems. This work focuses on the performance of OFDM when used as a modulation and access technique for the uplink of an interactive wireless broadcasting system. In such an application, we present our investigations of the effects of symbol timing misalignments and peak-to-average power ratio (PAR). Under the condition of the same side information bits, the selective mapping (SLM) approach can be implemented by decimating OFDM samples, which is less complex compared to the ordinary SLM incurring a slight degradation of the PAR performance. Taking into account the effects of clipping operation and symbol timing misalignment, the bit error rate (BER) and throughput performances are investigated for a typical OFDMA uplink scenario.
Keywords:
interactive broadcasting
OFDM
OFDMA
peak-to-average power ratio (PAR)
selective mapping (SLM)
symbol timing misalignment
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4.8
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2.1K
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