排序方式: 共有102条查询结果,搜索用时 0 毫秒
1.
2.
基于XILINX公司的TPC IP core设计了码率为3/4的TPC编解码器。此3/4Turbo乘积码(Turbo productcode,TPC)编码是在码率为(64,57)×(64,57)的二维TPC编码的基础上截短得到的。该编码采用IEEE802.16和IEEE802.16a标准中规定的生成多项式。设计中采用了周期为220-1的二进制伪随机序列作为信源,利用AWGN IP core生成数字高斯白噪声,对3/4TPC的性能进行了测试。采用BPSK调制在Eb/N0为4.0dB时,测得的信道的误码率为2×10-6,信息速率可以达到49Mbps,与Matlab的仿真结果相比大约有0.2dB左右的误差。所有程序都在一片FPGA VirtexII2000中完成。 相似文献
3.
4.
描述了一个利用MATLAB设计的仿真平台,用于分析Turbo码应用于AM频段数字音频广播系统的性能,简要说明了平台中使用的Turbo码的编、解码算法。利用此平台以DRM(全球数字广播)系统的参数和AWGN信道为例进行仿真,结果表明,在所分析的情况下,应用Turbo码可以得到较好的性能,并在技术上有一定的可实现性。 相似文献
5.
Ke Xiong Pingyi Fan Zhengding Qiu Khaled Ben Letaief 《Wireless Communications and Mobile Computing》2014,14(1):37-55
Signal‐time coding (STC) is a newly proposed transmission scheme for half‐duplex relay networks, which is able to achieve higher information flow rate by combining the traditional encoding/modulation mode in the signal domain with the signal pulse phase modulation in the time domain. However, most of the results for STC are only obtained under the ideal assumptions that the signal detections at physical layer are perfect and there are still a lot of fundamental problems to be explored. This paper considers the implementing issues of STC at physical layer in additive white Gaussian noise relay networks. Firstly, a performance evaluation criterion, the reliable information per symbol (RIPS), is proposed to characterize the performance of STC in noisy wireless networks. Secondly, a new construction scheme based on route ID for the codeword of STC is presented, and some structural properties of the codeword of STC are investigated. Thirdly, the error probabilities of STC in both the signal domain and the time domain are discussed. Furthermore, two implementing schemes, that is, the energy detection based STC (ED‐STC) and the symbol detection based STC (SD‐STC), are proposed, and their performance bounds in terms of RIPS are discussed. Numerical analyses show that both ED‐STC and SD‐STC outperform traditional transmission methods in terms of effective information rate even under some practical conditions. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
6.
7.
在确定超宽带传输参考接收机模型的基础上,分析了基本TR接收机的误码性能,并在AWGN信道下进行了系统建模。仿真分析的结果表明,接收机的性能与脉冲对的重复数Ns、码元的积分时间以及接收机输入噪声带宽的大小之间均有规律可循,其适宜条件:Ns取3~5,标称积分时间等于脉冲宽度,噪声带宽应在保持正常接收时误码率为10-4或更低的水平选取。 相似文献
8.
Design of High Speed AWGN Communication Channel Emulator 总被引:3,自引:0,他引:3
Emmanuel Boutillon Jean-Luc Danger Adel Ghazel 《Analog Integrated Circuits and Signal Processing》2003,34(2):133-142
This paper presents a method for designing a high accuracy white gaussian noise generator suitable for communication channel emulation. The proposed solution is based on the combined use of the Box-Muller method and the central limit theorem. The resulting architecture provides a high accuracy AWGN with a low complexity architecture for a digital implementation in FPGA. The performance is studied by means of MATLAB simulations and various complexity figures are given. 相似文献
9.
AWGN和FEXT噪声下铜双绞传输线的信道容量 总被引:3,自引:0,他引:3
本文研究加性白高斯噪声和远端串音两种噪声并存时铜双绞传输线的信道容量,用数值方法给出了不同线路长度和不同输入功率时的信道容量,研究了达到信道容量时的最优输入功率谱密度分布。计算结果表明,在加性白高斯噪声和远端串音同时存在时,信号的输入功率谱不再为均匀分布,这种不均匀性随着输入功率的增加更为明显。这与干扰为纯白高斯噪声时,最优输入功率谱近似为均匀分布的结果是不同的。 相似文献
10.
The burst mode link analyser with least squares algorithm (BMLA/LS) is a real-time impulse or frequency response extraction (IRE/FRE) technique of a satellite communication channel, originated and explored by the author. This paper summarizes some key technical points of the BMLA/LS and presents its novel simulation results and applications in a land-mobile DBPSK/DQPSK satellite channel at Ka-band, including the channel additive white Gaussian noise (AWGN) effect on IRE/FRE by BMLA/LS, and the instantaneous IRE/FRE in a Rician channel with multi-path reflection, in a shadowed channel by trees and in a combinational fading channel, and their comparisons and conclusions. 相似文献