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Description: FPGA Implementation of Carrier Synchronization for QAM Receivers
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Size: 306314 |
Author: xianyue |
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Description: 16Qam的Matlab/Simulink仿真系统，包含匹配滤波，载波恢复，位定时恢复等个重要模块，加深对16Qam调制解调系统的理解-16Qam the Matlab/Simulink system, matched filtering, carrier recovery, rehabilitation Timing important module, the better modulation and demodulation system 16Qam understanding
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Size: 10240 |
Author: 李向坤 |
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Description: OFDM仿真
参数：
％ 子载波数 128
％ 位数/ 符号 2
％ 符号数/ 载波 1000
％ 训练符号数 0
％ 循环前缀长度 8 (1/16)*T
％ 调制方式 4-QAM
％ 多径信道数 3
％ IFFT Size 128
％ 信道最大时延 2
-OFDM simulation parameters : % subcarriers median number of 128%/2% Symbol Symbol/Carrier Training 1000% 0% Symbol few cyclic prefix length 8 (1/16)* T% modulation 4-QAM% multi-path channel number 3% 128% Size IFFT letter Maximum delay 2
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Size: 19456 |
Author: 高源 |
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Description: ＯＦＤＭ程序 波形如下
子载波数 128
％ 位数/ 符号 2
％ 符号数/ 载波 100
％ 训练符号数 0
％ 循环前缀长度 8 (1/16)*T
％ 调制方式 4-QAM
％ 多径信道数 3
％IFFT Size 128
％ 信道最大时延 2-OFDM waveform procedures following subcarriers median number of 128%/2% Symbol Symbol/Carrier 100% Training a few symbols 0% cyclic prefix length 8 (1/16)* T% modulation 4-QAM% multi-path channel number 3% IFFT Size 128% maximum delay Channel 2
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Size: 4096 |
Author: 唐成玉 |
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Description: 看重讨论了数字接收机中载波同步环的一种设计方法,详细分析了从模拟域到数字域的转化过程，并以16QAM数字接收机载波同步环为例给出了相应的结论-Seriously discussed the digital receiver carrier synchronization in a ring design methodology, a detailed analysis of the domain from analog to digital domain of the transformation process, and 16QAM digital receiver carrier synchronization loop as an example the corresponding conclusions
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Size: 108544 |
Author: 周禹 |
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Description: 描述了一个用于微波传输设备的16QAM接收机解调芯片的FPGA实现,芯片集成了定时恢复、载波恢复和自适应盲判决反馈均衡器(DFE),采用恒模算法(CMA)作为均衡算法。芯片支持高达25M波特的符号速率,在一片EP1C12Q240C8(ALTERA)上实现,即将用于量产的微波传输设备中。
-Describes a microwave transmission equipment for 16QAM receiver demodulator chip FPGA realization of an integrated chip timing recovery, carrier recovery and blind adaptive decision feedback equalizer (DFE), using constant modulus algorithm (CMA) as the equalization algorithm. Chip supports up to 25M baud symbol rate, in the midst of EP1C12Q240C8 (ALTERA) achieved for the upcoming production of microwave transmission equipment.
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Size: 281600 |
Author: 萝卜 |
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Description: WLAN仿真－发送机
wlan No Comments
设置完系统参数后，开始产生发送数据。
1. 产生随机的发送bit（tx_bits），这里不考虑信道编码。
2. QAM映射
3. 将数据映射到不同载波，形成OFDM符号
4. 产生pilot，并将pilot插入OFDM符号中
5. 加入dc和guard子载波
6. 进行ifft，将频域信号变到时域，并加入循环前缀
7. 对信号进行overlap window
8. 在时域产生short preamble
9. 在时域产生long preamble
10. 将preamble和数据符号组成packet
11. 升采样
得到信道传输的数据Tx_signal_up
具体程序见附件 wlan_transmitter.m-WLAN Simulation- wlan No Comments transmitter system parameters set finished, the beginning to have to send data. 1. Have sent random bit (tx_bits), here does not consider channel coding. 2. QAM mapping 3. The data is mapped to a different carrier to form OFDM symbols 4. Have a pilot, and pilot inserted OFDM symbols 5. Adding dc and guard subcarriers 6. To carry out ifft, will change the frequency domain signal to time domain, and add cyclic prefix 7. the signals overlap window8. In the time domain have a short preamble9. In the time domain have a long preamble10. the preamble and data symbols packet11. or sampling received data transmission channel Tx_signal_up specific procedures see Annex wlan_transmitter.m
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Size: 1024 |
Author: 福东方 |
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Description: 摘要:基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向，交频分复用
OFDM)是一种无线环境下的高速传输技术，它对高速列车控制信息传输中卞要受到的由于多
径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和
基本原理，然后在计算机上用M atlal〕对其性能进行了仿真，仿真中将OFDM与传统的单载波
调制方式—i1，交振幅调制( 1frQAM)对抗多径十扰的性能进行了比较，最后分析了一者的仿真结果.
-Abstract: Based on the communication technology train operation control system (CBTC) is a railway signal direction for the development of cross-frequency division multiplexing OFDM) is a wireless environment of high-speed transmission technology, its high-speed train control information transmission Bian be subject to the Due to the spread of multi-path fast fading caused by the impact of a strong resistance to diseases. This paper first introduces the OFDM technology development and the basic principles, and then on the computer〕 M atlal use its performance simulation will OFDM with the traditional single-carrier modulation-i1, cross-amplitude modulation (1frQAM) against multi-path interference of the 10 properties were compared with a final analysis of the simulation results.
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Size: 36864 |
Author: ma ming |
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Description: 利用matlab仿真软件，实现8QAM调制。在实现时采用正交调幅的方式,某星座点在I坐标上的投影去调制同相载波的幅度,在Q坐标上的投影去调制正交载波的幅度,然后将2个调幅信号相加就是所需的调相信号。-Use of matlab simulation software to achieve 8QAM modulation. In achieving the adoption of quadrature amplitude modulation means of a constellation in the I coordinates of the projection to the modulation of the amplitude-phase carrier, in the Q coordinates of the projection to the range of carrier orthogonal modulation, and then the sum of two AM signals is the required phase modulation signal.
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Size: 1024 |
Author: yanyan |
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Description: QAM for WCDMA in wireless comunication for the implementation of WCDMA over the 2G
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Size: 311296 |
Author: NRRAAJAN |
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Description: 16QAM仿真的程序，包含载波、眼图、星座图等多个通信常见图形的仿真-16QAM simulation procedures, including the carrier, the eye diagram, constellation diagram, and many other common graphics communication simulation
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Size: 3072 |
Author: 王子楠 |
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Description: QAM simulation using a carrier cosine wave with ISI
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Size: 407552 |
Author: adi |
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Description: verilog编写的16qam调制程序，将所有东西装入工程，运行mmm16主程序。其中载波为一个周期采十个点，并乘以2^8-1取整数。在quartusII运行通过。-verilog modulation procedures 16qam prepared all things into works mmm16 to run the main program. One carrier for a cycle of 10 points taken, and multiplied by an integer from 2 ^ 8-1. Running through the quartusII.
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Size: 5120 |
Author: 王力宏 |
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Description: QAM解调芯片中载波恢复的设计与实现，文件为MATLAB 源程序-QAM demodulator chip carrier recovery in the design and realization of the source file for the MATLAB
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Size: 1676288 |
Author: 王尊严 |
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Description: A MATLAB program has been written to investigate Orthogonal Frequency Division
Multiplexing (OFDM) communication systems. This program is valuable for future researchers
simulating systems that are too theoretically complex to analyze. Single-carrier QAM and multicarrier
OFDM are compared to demonstrate the strength of OFDM in multipath channels. Two
graphical user interface demonstrations show some of the basic concepts of OFDM.
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Size: 950272 |
Author: king |
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Description: 摘 要:本文分析了在限幅噪声和高斯噪声环境下,在HFC 网中混合传输AM/ OFDM信号时的误
码特性,并与单载波AM/ QAM系统进行比较,结果表明OFDM系统由于多个子通道的稀释作用,其
抗限幅噪声性能比单载波系统好。
关键词:正交频分复用 HFC 网 限幅噪声 误码率-Abstract :Theoretical analysis is presented for the BER performance of hybrid AM/ OFDM system in the pres2
ence of clipping impulse and Gaussian noise ,and the OFDMBER has been compared with that of the single2car2
rier AM/ QAM system1It is found that ,due to the dilution effect of the subchannels ,OFDM is better than single2
carrier QAM in terms of the ability to resist chipping impulse noise interference1
Key words :OFDM HFC network clipping noise BER
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Size: 150528 |
Author: king |
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Description: 采用Xilinx的Sysgen工具建立的16QAM调制解调模型，其中包括信源生成、多普勒频偏、载波跟踪环路等。-Established by the use of Simulink model of 16QAM modulation and demodulation, including source generation, Doppler shift, such as carrier tracking loop.
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Size: 29696 |
Author: brady.zhou |
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Description: QAM载波跟踪程序，用matlab写的，小程序，很实用，可以-QAM carrier recovery
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Size: 1024 |
Author: liuyang |
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Description: 一篇高阶QAM（256阶）载波恢复的外文文献，提出了一种极性判决和判决引导的双模式载波恢复方法-a paper about carrier recovery of high order QAM signals
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Size: 414720 |
Author: 张三 |
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Description: The digital simulation system using MATLAB to illustrate the
Quadrature Amplitude Modulation (QAM). QAM is a modulation scheme to convey two digital bit
streams which can be converted to symbol signals by modulating the amplitudes and the phase of two
carrier waves. First, we transmit a signal composed of two different 1024 bit streams and modulate
them using QAM. Next, at the receiver, we demodulate them using an orthogornality of two carriers
and matched filters. We also conduct the error analysis of two sampled signals in order to observe how
the probability of making bit errors changes depending on the inverse of Power Spectral Density (PSD)
of Additive White Gaussian Noise (AWGN).
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Size: 713728 |
Author: khang
|
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