共查询到20条相似文献,搜索用时 0 毫秒
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Extending a Fixed-Complexity Sphere Decoder to Obtain Likelihood Information for Turbo-MIMO Systems 总被引:1,自引:0,他引:1
《Vehicular Technology, IEEE Transactions on》2008,57(5):2804-2814
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Fixing the Complexity of the Sphere Decoder for MIMO Detection 总被引:1,自引:0,他引:1
《Wireless Communications, IEEE Transactions on》2008,7(6):2131-2142
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Expressions are found for the effect of an error in the delay of the preceding signal, which provides the reference phase for the decoding of the present signal in differential phase-shift-keying reception. The signal-to-noise ratio is allowed to be different for the two signals that are compared by the receiver's phase detector. The results are applicable to both binary and quaternary DPSK. In addition, an approximation is obtained for the error probability when the two Signal-to-noise ratios are equal to the same large value. 相似文献
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该文在软输出固定复杂度球形译码(SFSD)算法的基础上,提出一种低复杂度高性能的MIMO迭代检测方法。该算法利用迭代过程中译码器的反馈信息更新SFSD检测算法的软输出,获得明显的迭代增益,并利用多级比特映射星座图的特点大大降低分支度量的运算次数。针对SFSD算法预处理复杂度较高的问题,该文将检测顺序调整和QR分解两个预处理步骤相结合,从而减少了矩阵求逆运算。在长期演进方案(LTE)下行链路环境中的仿真结果表明,该文提出的算法性能十分接近最优的最大后验概率(MAP)检测,并且实现复杂度相对于MAP有显著的下降。 相似文献
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该文提出了一种广义复球形解码算法。它能处理多输入多输出系统(MIMO)中发送天线多于接收天线的情形,并能同时检测具有格型结构和不具有格型结构的二维空间星座信号。该算法对信号矢量的超定部分进行优化搜索,从而避免了穷尽搜索的高复杂度。仿真结果表明该广义复球形解码算法的复杂度明显低于采用穷尽搜索策略的复杂度。 相似文献
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Zhou Huayi Fu Yuxiang Zhang Zaichen Gross Warren J. You Xiaohu Zhang Chuan 《Journal of Signal Processing Systems》2020,92(5):517-528
Journal of Signal Processing Systems - Polar codes, first achieving the capacity of symmetric binary-input discrete memoryless channels (B-DMCs), have been standardized for eMBB control channels.... 相似文献
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简要介绍了无线M IMO(多输入多输出)系统模型,研究了CL以及KCL球解码算法,并对其性能和复杂度进行了比较;重点介绍了CLimp算法,这种近似算法是一种新的低计算量、准最优的球检测算法,并对其性能进行了详细分析。在此基础上,提出了加权KCL与CLimp近似算法结合的JCLimp新算法,仿真结果表明此新算法在与CL算法、CLimp算法误比特率性能近似的情况下,算法复杂度具有一定的优势,证明了JCLimp算法的有效性。 相似文献
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在突发信道中,同步误差会显著降低Turbo码的误比特率性能。利用二进制对称信道(BSC)和高斯信道(AWGN)的级联进行信道建模,提出了一种扩展的Turbo译码结构,该结构有效地克服了突发噪声带来的信号相位偏移。仿真结果表明这种方案与传统方法相比,在复杂提高不多的情况下,提高了误比特率性能。 相似文献
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When quadrature error exists, the shape of the M‐ary phase shift keying (MPSK) signal constellation becomes skewed‐elliptic. Each MPSK symbol takes on a different symbol error probability (SEP) value. The analytical results presented thus far have been derived from studies which examined the SEP problem assuming that the SEP of each MPSK symbol is equally likely; therefore, those results should not be treated as offering a complete solution. In this letter, we present a new and more complete solution to the SEP problem of MPSK by relaxing the above assumption and finding the expressions for the average as well as individual SEP in the presence of quadrature error. 相似文献
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Bin Liu Biao Chen Rick S. Blum 《Signal Processing, IEEE Transactions on》2007,55(2):656-664
In wireless networks, user cooperation has been proposed to mitigate the effect of multipath fading channels. Recognizing the connection between cooperative relay with finite alphabet sources and the distributed detection problem, we design relay signaling via channel aware distributed detection theory. Focusing on a wireless relay network composed of a single source-destination pair with L relay nodes, we derive the necessary conditions for optimal relay signaling that minimizes the error probability at the destination node. The derived conditions are person-by-person optimal: each local relay rule is optimized by assuming fixed relay rules at all other relay nodes and fixed decoding rule at the destination node. An iterative algorithm is proposed for finding a set of relay signaling approaches that are simultaneously person-by-person optimal. Numerical examples indicate that the proposed scheme provides performance improvement over the two existing cooperative relay strategies, namely amplify-forward and decode-forward 相似文献
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An upper bound on the bit error probability due to truncation of the path length in Viterbi decoding is obtained for any given convolutional code. This bound is then used to determine the path length at which the additional error probability due to truncation becomes negligible compared to the maximum likelihood decoding error probability. These results are tested by simulation using several short constraint length codes. 相似文献
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Minimum Shift Keying (MSK) is a method of modulation which can be viewed as a special case of Frequency Shift Keying or a special form of Offset Quadrature Phase Shift Keying; therefore, it can be detected either by a discriminator or with a pair of matched filters. In the latter case, the system is optimal, provided there are no bandlimiting filters in the transmitter and receiver. These filters introduce intersymbol interference and hence degrade the performance of the system. In this paper we investigate analytically the effect of a bandlimiting filter in the receiver on the error probability of the system, presenting numerical results when that filter is of the Butterworth type. It is shown that a very simple suboptimal detector outperforms the matched filter detector so long as2W/R_{b} < 1.3 , where Rb is the bit rate andW is the single sided 3 dB bandwidth of the bandlimiting filter. 相似文献
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In this paper, we evaluate the error probability of a PAM receiver, which derives symbol timing from the received waveform by means of a synchronizer. We point out that the conventional way (using the distribution of the synchronizer's modulo-2π- reduced phase error) of evaluating this error probability does not take into account the effect of the synchronizer's cycle slips. We present a correct expression for the error probability, which uses the distribution of the so-called renewal phase. Also, we derive simple but accurate approximations for both the conventional and the correct error probability, which clearly show the influence of the characteristics of the PAM receiver. These approximate expressions indicate that, for a decreasing additive noise level at the receiver input, the conventional error probability becomes vanishingly small, whereas the correct error probability approaches a nonzero value, which is inversely proportional to the mean time between slips. Hence, cycle slipping imposes a (sometimes rather large) lower limit on the attainable error probability. 相似文献
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本文研究了二元对称信道上,某些BCH码的不可检错误概率。首先得到了几个重要的不等式。然后证明了纠正两个错误二进制本原BCH码的扩展码是最佳检错码。 相似文献
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The bandwidth in which 99 percent of the power is contained is presented for ASK, QASK, OQASK, PSK, FSK, and MSK. An example is given in which the bandwidth of FSK is one eighth the bandwidth of ASK and of the modulating signal. Error probability is presented for the various types of modulation with various detectors, detector filters and Butterworth receiver filters of orderN = 4 orinfty . Comparisons are made between the performance and bandwidth efficiency of the various systems. 相似文献
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A simple technique for calculating the error probability performance and associated noisy reference loss of practical unbalanced QPSK receivers is presented. The approach is based on expanding the error probability conditioned on the loop phase error φ in a power series in φ and then, keeping only the first few terms of this series, averaging this conditional error probability over the probability density function of φ. Doing so results in an expression for the average error probability which is in the form of a leading term representing the ideal (perfect synchronization references) performance plus a term proportional to the mean-squared crosstalk. Thus, the additional error probability due to noisy synchronization references occurs as an additive term proportional to the mean-squared phase jittersigma_{phi}^{2} directly associated with the receiver's tracking loop. Similar arguments are advanced to give closed-form results for the noisy reference loss itself. 相似文献