The spectrum of radiated noise from ships consists of a continuous broadband spectrum and a discrete narrow-band line-spectrum.
船舶辐射噪声的功率谱由连续的宽带谱和离散窄带线谱组成。
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In this paper a fast algorithm for channel estimation in downlink TD-SCDMA systems has been proposed by analyzing the discrete-time base-band transmission model.
The results show: 1. There emerges a new bound state in the gap caused by thee-e interation, that is a shallow discrete level near the top of the valence band.