- 2006telb0024-Et-Tolba-(1) The major evolution of UMTS (Universal Mobile Telecommunications System) in recent years is the High Speed Downlink Packet Access (HSDPA)which provides data rates up to 10Mbps. The implementation of HSDPA includes multicodes transmission in joint application with Adaptive Modulation and Coding (AMC) as well as Hybrid Automatic Repeat reQuest (HARQ). This thesis deals with the implementation of the HSDPA simulator in FDD (Frequency Division Duplex) mode according to 3GPP technical specifications. It also aims to study the HARQ algorithms for HSDPA. The performance of AMC is significantly degraded when higher order modulation (16
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matlab编程，画出一段语音的语谱图，在不同时间声音的不同频率，可以比较出有声段和无声段的能量不同。-Matlab programming, draw the spectrogram of a voice, the sound of different frequencies in different time, you can compare audio segment and the energy of the silent segment.
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