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Published in:
2005 | OriginalPaper | Chapter
Novel Adaptive Subcarrier Power and Bit Allocation Using Wavelet Packet Parallel Architecture
Authors : Ren Ren, Shihua Zhu
Published in: Distributed and Parallel Computing
Publisher: Springer Berlin Heidelberg
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To realize the requirement of next mobile communication, the adaptive allocation schema of power and bit is presented by using discrete wavelet packet transform (DWPT). The subcarrier modulation and rate allocation method is used for OFDM-DS/CDMA system. According to the downlink channel feedback bit error rate (BER) acquired from uplink channel, an optimal wavelet packet multicarrier modulation allocation is established. For the given BER and QoS, the transmitting power is minimum. The system realizes the high frequency spectrum efficiency. The result shows that the adaptive wavelet packet algorithm not only has the fast convergence rate, but also achieves minimum complexity. The allocation proposed has better performance compared with traditional OFDM system. It is valuable that the system can adaptively adjust the power and bit rate to achieve minimum total transmission power in high rate and efficiency.