采用恒包络SQAM提高CDMA效率

[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI:10.1109/VETEC.1992.245399

Z. Wan, K. Feher

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引用次数: 10

摘要

为了减少对相邻信道的干扰，提高CDMA系统的处理增益，提出了一种功率效率高、频谱效率高的正交调幅叠加码分多址(SQAM-CDMA)系统。在硬限制功率放大信道中，SQAM-CDMA对相邻信道的带外功率干扰比QPSK-CDMA低12-16 dB，比BPSK-CDMA低11-15 dB。假设在给定的射频带宽下，需要低30 dB的带外干扰功率，在硬限制放大信道中，SQAM-CDMA的处理增益比QPSK-CDMA增加7 dB，比BPSK-CDMA增加9.5 dB。

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Improved efficiency CDMA by constant envelope SQAM

In order to reduce the interference into the adjacent channel and to increase the processing gain of the CDMA system, a power and spectral efficient superposed-quadrature-amplitude-modulation code-division-multiple-access (SQAM-CDMA) system is proposed. In the hard-limited power amplified channel, SQAM-CDMA has about 12-16 dB lower out-of-band power interference into the adjacent channel than that of QPSK-CDMA, and 11-15 dB lower than that of BPSK-CDMA. Assuming a 30 dB lower out-of-band interference power is required in a given RF bandwidth, the processing gain of SQAM-CDMA is increased by 7 dB over QPSK-CDMA and 9.5 dB over BPSK-CDMA in the hard-limited amplified channel.<>

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[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology

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