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相关衰落信道上MIMO系统中组合SC/MRC的性能分析 总被引:1,自引:0,他引:1
研究相关瑞利衰落信道上MIMO系统中组合发射机选择合并(SC)/接收机最大比合并(MRC)的天线分集系统性能.使用矩生成函数方法,推导相关瑞利衰落信道上采用组合SC/MRC天线分集争相干检测的M进制相移键控(MPSK),M进制正交幅度调制(MQAM),M进制脉冲幅度调制(MPAM)等几种M进制数字调制方式的误符号率精确表达式.数值计算结果阐明相关性和天线阵结构对采用组合SC/MRC天线分集的几种M进制数字调制方式的平均误符号率性能的影响. 相似文献
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本文研究了卷积LDPC码在瑞利衰落信道下的译码性能,给出了瑞利信道下,卷积LDPC码的译码算法,在同等条件下对比了卷积LDPC码在高斯信道和瑞利衰落信道下的译码性能。 相似文献
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本文提出了一种适合于广义多径信道多进制差分相移键控信号相位比较解调的性能分析方法,推导出符合平均错误率积分表达式。该表达式考虑了信号幅度衰落,时间选择性衰落和高斯白噪声对体制性能的影响。并针对几种形式的衰落功率谱分别对二进制,四进制和八进制的符号平均错误率进行了数值计算,讨论了衰落功率谱的形式对MDPSK信号性能的影响,并给出了MDPSK信号的“不可克服符号错误率”与衰落功率谱归一化带宽的关系曲线 相似文献
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最小移频键控信号的检测和误码性能分析 总被引:3,自引:0,他引:3
首先介绍了MSK信号差分检测原理。其次,分析了存在相关高斯噪声和信道有瑞利衰落时MSK的抗噪声性能。结果表明,在高斯噪声时的差分MSK的误码率与DPSK相同;而当信道存在瑞利衰落时将严重影响系统的抗噪声性能。所得结论能为系统的设计提供重要依据。 相似文献
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本文分析了多径衰落信道接收信号的特点,建立了多径传播的仿真模型,并对正交频分复用OFDM系统,分别通过AWGN高斯信道、两径瑞利衰落信道、六径瑞利衰落信道进行计算机模拟仿真,得出OFDM系统具有抗多径衰落性能的结论. 相似文献
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研究瑞利衰落信道上使用发射天线选择和空时分组编码的多输入多输出系统的误码性能。使用矩生成函数法和Apell超几何函数、Lauricella多变量超几何函数,推导采用相干检测的M进制相移键控(MPSK)和广义矩形M进制正交幅度调制(GR-MQAM)的平均符号错误概率(SEP)的精确闭合表达式。数值计算结果表明:增加发射天线或/和接收天线数可以改善MIMO瑞利衰落上MPSK和GR-MQAM的平均SEP性能。 相似文献
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首先对移动通信常见信道模型进行了简要讨论,然后模拟和比较了不同信道条件对系统性能的影响;重点研究了高斯信道、瑞利衰落信道等信道模型。 相似文献
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本文介绍了不同解调方式下MSK的误码性能,导出了存在相关高斯噪声、判决门限抖动及信道有瑞利衰落时的差分MSK的误码公式。结果表明,存在相关高斯噪声时的差分MSK的误码率与DPSK相同;当系统存在判决门限抖动,且抖动相位ε≥10°时,系统误码性能严重下降;而信道的瑞利衰落存在将严重影响系统误码性能。 相似文献
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Data transmission using M -ary differential phase shift keying (MDPSK) over the nonselective Rayleigh fading channel with diversity reception is considered. While previous studies on error probability mostly assume no fading fluctuation, the author considers, exclusively, the case in which the fading process fluctuates from one symbol interval to the next. Exact bit error probability results for 2, 4, and 8 DPSK as well as tight upper bounds are derived. Some applications of the results are discussed 相似文献
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A closed-form expression for the bit error rate of 4-DPSK in fast Rician fading and white Gaussian noise is presented. This expression is a supplement to an already known formula for the symbol error rate of MDPSK, which can be evaluated only by numerical integration 相似文献
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A formula for the symbol error probability is derived which applies to differential detection ofM -ary phase-shift keying (MDPSK) in fast Rician fading and white Gaussiau noise. This formula is an extension of a result already known for MDPSK in Gaussian noise interference. 相似文献
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A closed-form formula for symbol-error rate (SER) of an orthogonal frequency-division multiplexing (OFDM) system with M-ary differential phase-shift keying (MDPSK) in frequency domain over Rayleigh fading channels is obtained. It is found that, by MDPSK in frequency domain, identical SERs can be achieved on all subcarriers. However, both time and frequency dispersion in the channel will introduce error floors. A comparison between OFDM-MDPSK in frequency domain and that in time domain reveals that the former system offers superior SER performance in a fast fading environment, while the latter performs better if the channel is mainly frequency selective. Moreover, the former system has lower implementation complexity. 相似文献
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Closed-form solutions for the average error rate of MDPSK, coherent MPSK, and noncoherent MFSK over slow, flat, Rician fading are derived. The solutions are sufficiently simple so that no approximations are needed for the numerical computations and general enough so that it includes AWGN and Rayleigh fading as special cases. Error probabilities are graphically displayed for various values of M. The dependence of error rate on the channel specular-to-scatter ratio are plotted and examined. Performance comparisons for a range of values of the Rician parameter K, corresponding to the measured statistics of mobile and indoor wireless channels, are made for the different digital modulation schemes. The analytical results presented in this paper are expected to provide information that is important for radio systems design and the evaluation of performance over a fading channel 相似文献
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In this paper, we derive exact closed form bit error rate (BER) or symbol error rate (SER) expressions for orthogonal frequency division multiplexing (OFDM) systems with carrier frequency offset (CFO). We consider the performance of an OFDM system subject to CFO error in additive white Gaussian noise (AWGN), frequency flat and frequency selective Rayleigh fading channels. The BER/ SER performances of BPSK and QPSK modulation schemes are analyzed for AWGN and frequency-flat Rayleigh fading channels while BPSK is considered for frequency-selective Rayleigh fading channels. Our results can easily be reduced to the respective analytical error rate expressions for the OFDM systems without CFO error. Furthermore, the simulation results are provided to verify the accuracy of the new error rate expressions. 相似文献
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Jun Lu Tjeng Thiang Tjhung Adachi F. Cheng Li Huang 《Vehicular Technology, IEEE Transactions on》2000,49(4):1216-1225
A closed form formula is derived for the bit error rate (BER) of orthogonal-frequency-division-multiplexing (OFDM) with M-ary differential-phase-shift-keying (MDPSK) systems in frequency-selective Rayleigh and Rician fading channels with diversity reception. New BER curves are obtained as a function of the rms delay spread of the diffused component for three different types of delay profiles: (1) one-sided exponential, (2) uniform and (3) double spike profiles. Both slow and fast fading conditions are considered. It is shown that the existence of a strong line-of-sight (LOS) component and the use of reception diversity can effectively improve transmission performance 相似文献
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WANG Zhong-peng~ QIU Zhong-yuan~ WU Wei-ling~ .Information Enginnering School of Beijing University of Posts Telecommunications Beijing P.R. China .Information Engineering School Liaoning Institute of Technology Liaoning P.R. China 《中国邮电高校学报(英文版)》2004,11(Z1)
1 Introduction Recentinformationtheoryresultshaveshowntheenormouscapacitypotentialofwirelesscommunica tionsystemswithantennaarraysatboththetrans mitterandreceiver[1~ 3] .TheVBLASTarchitec ture[4~ 5] isonesuchapproach .VBLASTsystemstransmitparalleldatastreams,usingmultipleanten nas,simultaneouslyandinthesamefrequencyband .Withrichmultipathpropagation ,thesedif ferentstreamscanbeseparatedatthereceiverbe causeoftheirdistinctspatialsignatures.Inaflat fadingscatteringenvironmentwithindepen… 相似文献
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The authors deal with the detection of M-DPSK signals in slow m-distributed Nakagami fading and additive white Gaussian noise (AWGN). A simple formula is derived for the error probability, which allows the evaluation of symbol error rate (SER) and, via numerical integration, an assessment to be made of the performance of digital mobile radio systems. This new derivation comprises some previous results relevant to Rayleigh fading and to binary DPSK in m-distributed fading 相似文献