Group 3 error-free facsimile terminal for analog cellular networks

A Group 3 error-free facsimile terminal for use in an analog cellular network has been developed. This facsimile terminal is provided with the International Telecommunication Union (ITU-T, formerly CCITT) T.30 recommendation protocol and an adaptive error control scheme (AECS) for Group 3 communication and error-free communication. The AECS monitors the channel conditions and selects the optimum error correction code. The ITU-T V.27ter is used as the modulation method and the transmission rate is 4800 bps. This system is compatible with the modified Huffman (MH), modified READ (MR), and modified modified READ (MMR) image data compression codes. The average communication time of this facsimile terminal is 40 s per page while moving through the analog cellular network     

Adaptive error coding using channel prediction

In this paper, we construct a finite-state Markov chain model for a Rayleigh fading channel by partitioning the range of the received signal envelope into K intervals. Using a simulation of the classic two-ray Rayleigh fading model, a Markov transition probability matrix is obtained. Using this matrix to predict the channel state, we introduce an adaptive forward error correction (FEC) coding scheme. Simulation results are presented to show that the adaptive FEC coding scheme significantly improves the performance of a wireless communication system.     

An average error probability evaluation in a fading environment using finite state Markov channel for LEO satellite communication system

Recent research shows that fading channels have a much larger capacity than anticipated with traditional approaches. This modern view on fading channels encouraged us to characterize these channels more precisely for better identification and use of wireless channel capacity.Since the Markov model is a natural way to approximate a channel with memory, many people have considered finite state first-order Markov modeling for describing a wireless communication channel.In this paper, we first introduce the relationship between a physical fading channel and the corresponding finite state Markov Model (FSMC) in case of low earth orbit (LEO) satellite communication system, which can be used for performance evaluation in an M-order quadrature amplitude-modulation (MQAM) transmission scheme by deriving an analytical expression of average bit error rate in Rayleigh fading channel. By establishing the FSMC, we show that the FSMC is accurate enough to evaluate the performance of MQAM modulation scheme to be implemented on board a LEO satellite communication system.     

无人机数据链中卷积码研究与FPGA实现

信道编码是数字通信系统中的重要组成部分,它是保证信号可靠传输的一种重要方式,卷积码以其优越的性能被广泛应用在数字通信系统中。结合无人机信道的特性,研究分析了卷积码的性能特征,选定了适合无人机数据链特性的（2,1,2）卷积码,采用硬件描述语言实现了卷积码编译码器的硬件设计。实验结果表明,在纠错能力范围内,该设计方案能够正确纠错并译码,并且具有较高的译码速率,提高了无人机数据链的通信质量和抗干扰性能。     

Adaptive coding modulation selection optimisation scheme for Ka-band LEO mobile satellites

To address the problem that Ka-band satellite communication signal transmission is easily affected by rainfall and terminal environment, combining the characteristics of high-speed movement of LEO satellites and the wave propagation characteristics of satellite-ground links, this paper establishes a Markov synthesis model of four-state satellite channels based on Ka-band that integrates rainfall attenuation and terminal shadow attenuation, and a scheme for adaptive coding and modulation selection based on the DVB-S2 standard is proposed. Based on this, a rainfall fading probability density function (PDF) based on the satellite elevation angle variation is derived, and a more efficient and streamlined set of modulation and coding(MODCOD) is obtained through simulations and calculations. The simulation results show that the proposed scheme not only effectively solves the problem of severe fading of the transmission signal due to rainfall, ground movement environment and satellite mobility but also significantly reduces the system complexity of the original DVB-S2 standard scheme with little loss of efficiency.     

基于HARQ机制的数据链通信性能分析

利用JTIDS数据链现有的编码体制提出了一种基于HARQ机制的数据链通信模式,以提高报文传输的可靠性.首先对JTIDS系统的时隙结构进行改进,建立了HARQ机制的反馈信道,以保证该通信模式的实现;然后分析了JTIDS数据链系统在莱斯信道环境下的符号误码率,并在此基础上采用Markov模型对基于HARQ机制的数据链通信模式进行性能分析,评估了在该机制下通信的吞叶量、报文到达率、报文服务率和报文传输服务时延;最后,利用GSPN网对基于HARQ机制的数据链通信模式进行仿真分析,仿真结果表明采用HARQ机制的数据链通信系统能够很好地改善在恶劣信道环境下的报文传输能力,提高报文传输的可靠性.     

LEO星地Wi-Fi方案设计与验证

低轨(LEO)卫星到地面之间的无线保真(Wi-Fi)通信系统当前已经获得了广泛关注.针对LEO卫星信道的高误码、长时延等特点,采用导频插入、选择重传、帧聚合等方法对IEEE802.11 g进行改进,并在开放式无线接入研究平台(WARP)v3上完成了改进方案的设计.对改进后方案的多普勒频偏性能、远距离传输速率以及高速移动条件下的传输速率等系统性能进行测试的结果表明,改进后方案在复杂信道环境下可以获得比商业Wi-Fi更好的系统性能.通过模拟验证改进方案的系统性能,证明了基于LEO卫星的Wi-Fi卫星通信系统的可实现性.     

线性均衡算法在高铁车灯通信中的应用研究

文章提出了基于高铁前车大灯的对地大数据传输方案,采用基于LED的车灯搭建了可见光通信系统,针对车灯作为发射器件存在带宽受限、接收信号失真的问题,研究了迫零和基于压缩感知的线性均衡方法,有效提升了系统的带宽,并显著降低误码率,实现了超过1.18 Gbps的数据传输速率。结果表明,高铁车灯通信有望在未来实现高速通信,解决目前高铁大数据传输的难题。     

ATCMQAM蜂窝系统数据容量分析

本文提出一种将引导码元辅助调制(PSAM:Pilot Symbol Assisted Modulation)与基于M-QAM的自适应TCM调制(ATCMQAM)相结合的自适应传输体制.同时建立了一个基于TDMA/FDMA蜂窝小区的数据容量解析模型来分析该体制的性能.数值仿真结果表明:信噪比估计误差小于3dB,归一化运动距离小于0.4λ(λ载波波长)时,该体制的数据容量比固定方式4PSK提高80%.     

基于MSP430微处理器的光无线数据传输系统

提出了一种基于MSP430 微处理器的无线光通信系统应用于运动部件数据传输的方案,设计了该系统数据发送模块和接收模块并阐述了其工作机制.为了能在高速率数据猝发传输时保证数据的正确和完整,系统运用了自行设计的数据帧结构和编码方式,有效地降低了数据传输的系统误码率,保证了通信的可靠性.     

无人机数据链中Turbo码研究与FPGA实现

无人机数据链系统与地面控制站进行的是遥测数据、侦察图像和遥控指令传输,因此高质量的通信是确保无人机数据链发挥效能的关键。针对无人机信道的特点和要求,研究分析了无人机信道的统计模型,重点分析了影响Turbo码性能的一些主要因素,采用硬件描述语言VerilogHDL实现了Turbo码编译码器的FPGA设计。实验结果表明,在纠错能力范围内,该设计方案能够正确纠错并译码,并且具有较高的译码速率,提高了无人机数据链的通信质量和抗干扰性能。     

Protocol configuration and verification of an adaptive errorcontrol scheme over analog cellular networks

A high-speed and error-free voiceband data communication method using a hybrid automatic repeat request (ARQ) protocol over an analog cellular system is described. The present method adopts an adaptive error control scheme. This error control scheme automatically selects the optimal error correction code according to circuit bit error rate (BER), so as to match it to the frequently changing mobile radio propagation path conditions. This method adopts multiframe rejection as a retransmission scheme for a high throughput efficiency on the burst error circuit. Actual field evaluation was made by mounting this protocol on a CCITT V.22 bis modem with a data transmission speed of 2400 b/s and a modulation method using 16 carrier states over the Advanced Mobile Phone Service (AMPS) in Atlanta, GA, verifying that data communications can be achieved with an average throughput efficiency of 70% over a radio channel having a BER up to 10^-2     

高速数据通信及其差错控制研究

提出一种基于嵌入式时钟的高速数据通信方案及其差错控制编译码算法,并分析了性能。采用信道编码调制技术将时钟信息嵌入到高速串行数据流中,实现自同步传输,突破了外同步方式下传输距离和传输速率的上限,使远程传输带宽达3Gbps以上。针对高速调制信道的特点,在经典汉明码基础上引入交织技术,把可能存在的连续误码转为单个随机错误,简化了差错控制算法的复杂度,提高了编码效率和纠错性能。其编译码电路延时小、易实现、码率易控,方便高速数据通信系统应用,且能显著改善低信噪比条件下传输的可靠性。     

Impact of bursty error rates on the performance of wireless local area network (WLAN)

With an increasing popularity of DCF based wireless LAN, the modeling of 802.11 distributed coordination function (DCF) has attracted lots of research attention. Existing analysis of 802.11 DCF has been focused on the determination of the throughput and the packet delay under saturated traffic and ideal channel conditions. Although some recent papers address the saturated performance under a simple uniform error model, they can hardly capture the impact of bursty characteristics of wireless fading on the performance of 802.11 DCF. This paper presents exact formulae for the throughput and the delay in DCF for various traffic conditions when either saturated or unsaturated traffic load is present. A two-state Markov channel model is incorporated to present the bursty characteristics of channel errors. With our analysis, the impact of bursty channel error on unsuccessful transmission probability and the DCF performance can be determined. The results of our analytical framework reveal that the four-way handshaking scheme does not improve throughput substantially for light traffic load. However, for heavy traffic load, the four-way handshaking scheme is advantageous as compared to the basic access scheme. Also, extensive simulation is done to substantiate the accuracy of our analytical model.     

自适应移动信道模型的研究和模拟

研究和模拟了建立一个自适应移动信道模型的全过程。根据所建模型的参数,用计算机软件实现方法产生出描述移动信道长突发错误特性的差错序列。并提出了一种门限电平法检验了所建模型的精确度。     

激光制导武器半实物仿真中激光能量模拟误差研究

激光制导武器半实物仿真中通过对激光能量精确控制,来逼真模拟战场环境下激光导引头接收到的激光能量。需要对激光能量模拟误差进行分析研究,以保证半实物仿真的可信度。重点分析了半实物仿真中激光信号传输的全过程,给出了激光信号传输各环节引起的能量控制不确定度;提出了激光能量密度模拟误差模型和误差分析方法,举例说明了该误差分析方法的具体应用,并设计实验验证了模型准确性。根据误差分析模型,可有效评估激光能量密度模拟误差,优化仿真想定设计,保证半实物仿真结果精度。     

An all-optical method of developing data communication system with error detection circuit

The basic criterion of data communication is that received data should exactly be the replica of the transmitting data. If any error is introduced in the received data, then data transmission should be stopped immediately. In this article the authors have developed an all-optical method of data communication system with error detection mechanism that works with frequency encoded data. Basic building blocks of the proposed data communication scheme are parity generator and parity checker which are developed from all optical XOR logic gates. Simulation results testify the feasibility of the proposed scheme. These logic gates are developed exploiting nonlinear polarization rotation based frequency conversion and switching character of semiconductor optical amplifiers. The scheme with frequency encoded data, high speed of frequency conversion and polarization switching action of semiconductor optical amplifier offers secure, error free, faster data communication network.     

基于误码率的DF协作通信系统功率分配方法

针对协作通信系统能量有限和误码率高等问题,在DF协作通信系统中,研究一种基于误码率的概率分配算法。在总发射功率一定的条件下,建立以满足最小误码率为目标的优化问题。利用Lagrange乘子,求解该优化问题的闭式解,得出最佳功率分配方案。仿真结果表明,在总功率一定的情况下,该功率分配算法较其他功率分配方案具有较低的误码率。     

Markov models for the physical layer block error process in a WCDMA cellular system

In this paper, we investigate the possibility of using Markov chains to model the error process in the data blocks delivered by the physical layer of wideband code division multiple access a (WCDMA) cellular system. Suitable Markov models (MM) are designed to fulfil the two following objectives: First, an upper layer protocol supplied by the output obtained from the MM should behave as if it were running on the actual physical layer; second, MM parameters should be linked via simple relationships to the main physical layer parameters. Starting from the results on the error statistics obtained from a suitable simulation tool which jointly performs system and link level analysis, we first classify the users on the basis of performance level and burstiness, and then, we provide some guidelines for the design of Markov models in the different system and channel conditions. The performance of an automatic repeat request (ARQ) (Go-Back N) protocol at the link layer is taken as an example to test the accuracy of the proposed models. It is shown that the perspective of using simple error models in the analysis of upper layer protocols is feasible in many cases.     

High capacity wireless multimedia transmission with unequal error protection over Rayleigh fading channel

Efficient use of the available bandwidth and power resources for real-time multimedia transmission with high data rate and quality of service guarantee is one of the main challenges for next generation wireless systems. In image and video applications, the reception quality is highly sensitive to transmission delay, data loss, and error performance. Therefore, feasible transmission techniques over realistic channel conditions and detection methods are required to meet the increasing demands of multimedia services. In this paper, adaptive real-time communication (ARTC) system based superposition coding and layered detection is proposed for higher capacity visual data transmission over Rayleigh fading channel with unequal error protection (UEP). In the transmitter side, the source data is splitted into two streams depending on their importance, high priority and low priority. These two bit streams are modulated individually using different adjustable power allocation ratio according to partial feedback of channel state information with a constraint of total transmitted power during every symbol period. The received signal is detected using low complexity layered receiver with successive interference cancellation. To evaluate the system performance, constellation constrained capacity formula is derived. Under same resources of bandwidth, power, and time, extensive simulation results demonstrate the effectiveness of proposed ARTC scheme and shows significant improvement in capacity and bit-error-rate compared with the conventional direct single stream transmission and hierarchical modulation. Furthermore, the unequal importance characteristics of visual data are well exploited to attain reliable communication with UEP property.