Bit allocation algorithm for multi-user adaptive OFDM system with adaptive trellis coded MQAM

In this paper, a multiuser adaptive OFDM (orthogonal frequency-division multiplexing) transmission system is simulated. A bit allocation algorithm is considered in this system We propose a DCA-DBA-DCA algorithm using the adaptive trellis coded modulation (ATCM) and compare its performance with fixed...

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Bibliographic Details
Main Authors: Shenghui Song, Chunping Hou, Dazhong Cao
Format: Conference Proceeding
Language:English
Subjects:
Adaptive algorithm
Adaptive systems
Bit rate
Channel allocation
Computational efficiency
Computational modeling
Frequency division multiplexing
Modulation coding
OFDM modulation
System performance
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Summary:In this paper, a multiuser adaptive OFDM (orthogonal frequency-division multiplexing) transmission system is simulated. A bit allocation algorithm is considered in this system We propose a DCA-DBA-DCA algorithm using the adaptive trellis coded modulation (ATCM) and compare its performance with fixed OFDM and other adaptive algorithms. The simulation shows that DCA can increase system performance by 5/spl sim/6 dB and our system can greatly reduce the computational cost while maintain a fairly good QoS. By changing the interval between two DCA (dynamic channel allocations) our system can be used in various environments.
ISSN:0840-7789
2576-7046
DOI:10.1109/CCECE.2002.1012938