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10285713
说明： 对语音编码技术的特点进行了分析与研究, 对波形编码,声码器和混合编码三种主要 的语音编码进行了比较, 并介绍了GSM 和CD(This paper analyzes and studies the characteristics of speech coding technology, compares the three main speech codes: waveform coding, vocoder and hybrid coding, and introduces GSM and CD.)
- 2019-03-27 23:52:25下载
- 积分：1
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V788d3
中兴手机v788d改cpn通过cpn改IMEI(change v788d cpn)
- 2014-01-16 15:17:02下载
- 积分：1
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VoiceModem
使用tapi实现的用语音modem进行接电话并播放wav文件的程序(A program which is realised by tapi, and in which a call is picked up and wav files can be played through voice modem )
- 2002-04-23 10:01:54下载
- 积分：1
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fangzhen
基于单音干扰的BPSK通信系统的误码率分析(BPSK communication system based on single-tone interference error rate analysis)
- 2021-04-21 22:08:49下载
- 积分：1
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BPSK-modulation--Hamming
BPSK调制，采用（15,11）汉明码对信号编码；然后对信号加噪，解调，译码。(BPSK modulation (15,11) Hamming code signal encoding then added noise to the signal, demodulation, decoding.)
- 2012-12-05 22:31:02下载
- 积分：1
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polar_codes
高斯加性白噪声信道下polar码的编译码程序，包括各种示例。(AWGN channel under the polar code codec program, including a variety of samples.)
- 2017-04-22 17:50:59下载
- 积分：1
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counterfun
CDMA系统中几种功率分配的算法。功率控制提高信道容量(CDMA system, several power allocation algorithms. Power control to improve channel capacity)
- 2008-04-29 08:06:15下载
- 积分：1
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s_4ASK
利用MATLAB/simulink实现4ASK调制(Using matlab simulink for simulation modulation
4ASk)
- 2010-12-06 09:23:32下载
- 积分：1
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BPSK调制仿真
bpsk调制仿真，可直接用
1、数字调制方法
数字调制就是把数字基带信号的频谱搬移到高频处，形成适合在信道中传输的带通信号。基本的数字调制方式有振幅键控（ASK）、频移键控（FSK）、绝对相移键控（PSK）、相对（差分）相移键控（DPSK）。在接收端可以采用想干解调或非相干解调还原数字基带信号。
数字信号的传输方式分为基带传输和带通传输。然而，实际中的大多数信道（如）无线信道具有丰富的低频分量。为了使数字信号在带通信道中传输，必须用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。(1, digital modulation method
Digital modulation is the transfer of the spectrum of a digital baseband signal to a high frequency to form a bandpass signal suitable for transmission in the channel. The basic digital modulation methods are amplitude keying (ASK), frequency shift keying (FSK), absolute phase shift keying (PSK), and relative (differential) phase shift keying (DPSK). At the receiving end, the digital baseband signal can be restored by using dry demodulation or non-coherent demodulation.
Digital signal transmission methods are divided into baseband transmission and bandpass transmission. However, most channels in practice, such as wireless channels, have rich low frequency components. In order for a digital signal to be transmitted in a band channel, the carrier must be modulated with a digital baseband signal to match the signal to the characteristics of the channel.)
- 2019-05-28 10:46:01下载
- 积分：1
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socket
是学习socket编程难得的pdf，udp，tcp编程必看(It is rare to learn socket programming pdf, udp, tcp programming see)
- 2009-06-24 23:45:55下载
- 积分：1
