搜索：spectral
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https://www.eeworm.com/dl/544/41888.html
测试测量
LT5528 WCDMA ACPR和AltCPR测量
 
ACPR (adjacent channel power ratio), AltCPR (alternatechannel power ratio), and noise are important performancemetrics for digital communication systems thatuse, for example, WCDMA (wideband code division multipleaccess) modulation. ACPR and AltCPR are bothmeasures of ...
https://www.eeworm.com/dl/665/305575.html
matlab例程
JLAB is a set of Matlab functions I have written or co-written over the past fifteen years for the p
JLAB is a set of Matlab functions I have written or co-written over the past fifteen years for the purpose of analyzing data. It consists of four hundred m-files spanning thirty thousand lines of code. JLAB includes functions ranging in complexity from one-line aliases to high-le ...
https://www.eeworm.com/dl/521906.html
论文
Full-Duplex+Small+Cells
The recent developments in full duplex (FD) commu-
nication promise doubling the capacity of cellular networks using
self interference cancellation (SIC) techniques. FD small cells
with device-to-device (D2D) communication links could achieve
the expected capacity of the future c ...
https://www.eeworm.com/dl/522115.html
书籍
Signal Processing for Telecommunications
This paper presents a Hidden Markov Model (HMM)-based speech
enhancement method, aiming at reducing non-stationary noise from speech
signals. The system is based on the assumption that the speech and the noise
are additive and uncorrelated. Cepstral features are used to extract s ...
https://www.eeworm.com/dl/571/21265.html
模拟电子
数字预失真(DPD)算法研发工具和验证方案
在无线通信系统全面进入3G并开始迈向 4G的过程中，使用数字预失真技术（Digital Pre-distortion，以下简称DPD）对发射机的功放进行线性化是一门关键技术。功率放大器是通信系统中影响系统性能和覆盖范围的关键部件，非线性是功放的固有特性。非线性会引起频谱增长(spectral re-growth)，从而造成邻道干 ...
https://www.eeworm.com/dl/517138.html
论文
基于频率插值的4.0kbps 语音编码器的性能和设计（英文）
The 4.0 kbit/s speech codec described in this paper is based on a
Frequency Domain Interpolative (FDI) coding technique, which
belongs to the class of prototype waveform Interpolation (PWI)
coding techniques. The codec also has an integrated voice
activity detector (VAD) and a no ...
https://www.eeworm.com/dl/895851.html
技术资料
基于单片机的带频谱显示的迷你蓝牙音箱设计
市面上大部分蓝牙音箱的主要功能是对接收到的蓝牙音频信号进行解码,随后推动音频功率放大器进行音乐播放,很少出现能随音乐进行律动的、带多种显示效果的蓝牙音箱,为数不多的几款成本较高,体积也较大.通过一个8位单片机,搭配显示功能强大的LED驱动芯片、带功放的立体声蓝牙模块以及按键和喇叭,实现带频 ...
https://www.eeworm.com/dl/564/33807.html
通信网络
基于码本映射的语音带宽扩展算法研究
在现代通信系统中，电话语音的频带被限制在300 Hz～4 kHz的范围内，带来了语音可懂度和自然度的降低。为了在不增加额外成本的前提下提高语音的可懂度和自然度，进行了电话语音频带扩展的研究。提出了一种改进的基于码本映射的语音带宽扩展算法：在码本映射的过程中，使用加权系数来得到映射码本。客观 ...
https://www.eeworm.com/dl/895450.html
技术资料
基于STC89C51单片机的防盗报警系统设计
为了解决家庭防盗问题,完成住宅的报警功能,设计了一种基于STC89C51单片机的家庭防盗报警系统;通过在住宅或重点区域设置布防,系统由热释电红外探测器检测红外光谱信号;防盗报警系统的设计分为硬件和软件两部分,由信号检测电路,LED灯和蜂鸣器执行电路,GSM模块和单片机系统的基本外围电路组成系统的硬件系 ...
https://www.eeworm.com/dl/836135.html
技术资料
基于有蓝牙共存情况下的WiFi射频模块设计
移动通信网络由于带宽和技术的限制，远远不能满足人们不断高涨的无线上网需求。Wi-Fi作为无线接入技术MLAN的主流标准口益成熟，它能够随时随地高速连接到Internet，极大地满足了用户对无线上网需求，受到消费者的青睐。因而越来越多的移动终端都集成了Wi-Fi功能，Wi-Fi和蓝牙样成为移动终端的标配。随 ...