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2006 IEEE International Symposium on Information Theory最新文献

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Information Transmission over the Postal Channel with and without Feedback 有反馈和无反馈的邮政信道信息传输
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261562
Wenyi Zhang, S. Kotagiri, J. N. Laneman
The postal channel models a postal system in which letters, each consisting of a number of characters, are sometimes lost. We study the postal channel with variable-length letters and variable-length coding over letters, both with and without letter-by-letter feedback. Without allowing letter lengths to encode information, we examine one feedback strategy consisting of automatic repeat-request (ARQ) with exponentially increasing letter lengths. For this strategy we investigate an alternative notion of information rate per character, based upon the total, random number of characters required to convey the messages instead of its expectation. This information rate exhibits a phase transition in its convergence as the number of messages becomes large: if the letter lengths increase by a factor less than the inverse of the probability that a letter is lost, it converges to the channel capacity; otherwise, it converges to a number strictly larger than channel capacity. More generally, when we allow both the characters and the length of a letter to convey information, we compute the corresponding channel capacity with and without feedback, and find that it is twice the channel capacity of the original postal channel without allowing letter lengths to encode information
邮政通道模拟了一个邮政系统,其中每个字母由许多字符组成,有时会丢失。我们研究了具有变长信件和信件上的变长编码的邮政信道,包括有和没有逐信反馈。在不允许字母长度编码信息的情况下,我们研究了一种由自动重复请求(ARQ)组成的反馈策略,该策略具有指数级增加的字母长度。对于这个策略,我们研究了每个字符信息率的另一种概念,基于传递消息所需的随机字符总数,而不是其期望。随着信息数量的增加,该信息速率在收敛过程中表现出相变:如果字母长度增加的因子小于字母丢失概率的倒数,则它收敛于信道容量;否则,它收敛到一个严格大于信道容量的数字。更一般地说,当我们同时允许字符和字母长度传递信息时,我们计算有反馈和没有反馈时对应的信道容量,发现它是不允许字母长度编码信息的原始邮政信道容量的两倍
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引用次数: 0
AG Goppa Codes from Maximal Curves over determined Finite Fields of characteristic 2 特征2有限域上极大曲线的AG Goppa码
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261891
R. McEliece, M. C. Rodríguez-Palánquex
In AG coding theory is very important to work with curves with many rational points, to get good codes. In this paper, from curves defined over F2 with genus g ges 1 we give sufficient conditions for getting maximal curves over F2E2g
在AG编码理论中,处理具有许多有理点的曲线以得到好的编码是非常重要的。本文从F2E2g上具有g格1的曲线出发,给出了在F2E2g上得到极大曲线的充分条件
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引用次数: 0
Generalized Multilevel Constructions for Reed-Muller Codes and Barnes-Wall lattices Reed-Muller码和Barnes-Wall格的广义多层结构
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261788
A. Salomon, O. Amrani
Generalized multilevel constructions for binary Reed-Muller R(r,m) codes using projections onto GF(2q) are presented. These constructions exploit component codes over GF(2),GF(4),...,GF(2q ) that are based on shorter Reed-Muller codes, and set partitioning using partition chains of length-2l codes. This is then used for deriving multilevel constructions for the Barnes-Wall A(r, m) family of lattices. Similarly, the latter construction involves component codes over GF(2),GF(4),...,GF(2q) and set partitioning based on partition chains of length-2l lattices. These constructions of Reed-Muller codes and Barnes-Wall lattices are readily applicable for their efficient decoding
利用GF(2q)上的投影,给出了二进制Reed-Muller R(R,m)码的广义多层结构。这些结构利用GF(2)、GF(4)、…,GF(2q),基于较短的Reed-Muller码,并使用长度为2l码的分区链设置分区。然后将其用于导出巴恩斯-沃尔A(r, m)格族的多层结构。同样,后一种构造涉及GF(2)、GF(4)、…、GF(2q)上的构件编码,并基于长度为2l格的划分链进行集合划分。这些Reed-Muller码和Barnes-Wall格的结构很容易用于它们的高效解码
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引用次数: 0
Sub-optimal Power Allocation for MIMO Channels MIMO信道的次优功率分配
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261658
A. Grant, L. Hanlen
We consider t-input r-output Rayleigh fading channels with transmit-sided correlation, where the receiver knows the channel realizations, and the transmitter only knows the channel statistics. Using Lagrange duality, we develop an easily computable, tight upper bound on the loss in information rate due to the use of any given input covariance for this channel. This bound is applied to two simple transmission strategies. The first strategy is a reduced-rank uniform allocation, in which independent, equal power Gaussian symbols are transmitted on the at strongest eigenvectors of the transmit covariance matrix, where 0 les alpha les 1 is chosen to optimize the resulting information rate. The second strategy is water-filling on the eigenvalues of the transmit covariance matrix. The upper bound on loss shows these strategies are nearly optimal for a wide range of signal to noise ratios and correlation scenarios
我们考虑具有发射侧相关的t-输入r-输出瑞利衰落信道,其中接收机知道信道实现,而发射机只知道信道统计。利用拉格朗日对偶性,我们开发了一个易于计算的、紧的信息率损失上界,这是由于使用该信道的任何给定输入协方差造成的。这一界限适用于两种简单的传输策略。第一种策略是降阶均匀分配,其中在传输协方差矩阵的最强特征向量上传输独立的等幂高斯符号,其中选择0 les alpha les 1来优化生成的信息率。第二种策略是对传输协方差矩阵的特征值进行注水。损失的上界表明,这些策略在大范围的信噪比和相关场景下几乎是最优的
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引用次数: 4
A Novel Method for Combining Algebraic Decoding and Iterative Processing 一种代数译码与迭代处理相结合的新方法
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261714
Xiangyu Tang, R. Koetter
We propose novel error correction coding schemes called generalized integrated interleaving and sparsely integrated interleaving codes. In the context of block interleaved codewords, generalized integrated interleaving allows nonuniform redundancy to be shared among all the interleaves. This allows the redundancy to be adjusted on-the-fly to better suit the error statistics of the channel or storage device. Sparsely integrated interleaving groups data nodes in a distributed storage system into subgroups. A data node can belong to several subgroups. Small errors are corrected locally within each subgroup. A localized algebraic iterative decoding algorithm is used to decode across subgroups to correct large errors that cannot be corrected within subgroups. Very little correction capability is sacrificed to achieve fast error correction and lower communication overhead. This scheme improves data access for all the data nodes and allows easy scaling of the distributed storage network
提出了一种新的纠错编码方案,即广义集成交错码和稀疏集成交错码。在块交错码字的情况下,广义集成交错允许在所有交错中共享非均匀冗余。这允许对冗余进行动态调整,以更好地适应通道或存储设备的错误统计。稀疏集成将分布式存储系统中的数据节点相互交错地分组成子组。一个数据节点可以属于几个子组。小错误在每个子组内进行局部修正。采用局部代数迭代译码算法跨子群译码,以纠正子群内无法纠正的大误差。为了实现快速纠错和降低通信开销,牺牲了很少的纠错能力。该方案提高了所有数据节点的数据访问能力,并且易于扩展分布式存储网络
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引用次数: 39
Distributed LT Codes 分布式LT代码
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261875
Srinath Puducheri-Sundaravaradhan, J. Kliewer, T. Fuja
This paper proposes a novel distributed encoding procedure to realize codes that resemble LT codes (rateless codes for erasure correction) in both structure and performance. For the case of two sources communicating with a single sink via a common relay, this technique separately encodes k/2 symbols of information onto slightly more than k code symbols at each source. These two codewords are then selectively XOR-ed at the relay, such that the result can be decoded by the sink to recover all k information symbols. It is shown that, for the case of four sources communicating to a single sink, the use of a similar distributed LT code leads to a 50% reduction in overhead at the sink, compared to the use of four individual LT codes
本文提出了一种新的分布式编码方法,以实现在结构和性能上都类似于LT码(用于擦除校正的无速率码)的编码。对于两个源通过公共中继与单个接收器通信的情况,该技术分别将k/2个信息符号编码到每个源的略多于k个代码符号上。然后,这两个码字在中继上被选择性地异或化,这样接收器就可以对结果进行解码以恢复所有k个信息符号。结果表明,对于四个源与单个接收器通信的情况,与使用四个单独的LT代码相比,使用类似的分布式LT代码可使接收器的开销减少50%
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引用次数: 43
Throughput analysis for MIMO systems in the high SNR regime 高信噪比下MIMO系统的吞吐量分析
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261822
N. Prasad, M. Varanasi
Outage capacity and throughput are the two key metrics through which the fundamental limits of delay-sensitive wireless MIMO links can be studied. In this paper, we show that these metrics are intimately related, and consequently, as in the case of outage capacity, the growth rate of throughput with SNR rho is t log rho for a general class of fading channels (with channel state information at the receiver (CSIR) and with or without CSI at the transmitter (CSIT)) whose channel matrix is of rank t with probability one. However, while asymptotically tight affine lower bounds of the form t log rho + 0(1) were recently derived for outage capacity for such channels, in the sense that the limit as rho rarr infin of the difference between the outage capacity and the lower bound is zero, such affine lower bounds are not possible in general for the throughput. Using the t log rho + O(1) bounds on outage capacity however, lower bounds on throughput are specified where the high SNR limit of the ratio of the throughput and its lower bound is unity. These bounds reveal that the throughput optimal outage probability approaches zero as rho rarr infin. An important exception is the scenario where both the transmitter and receiver have CSI under the long-term power constraint (LTPC), for which we obtain a lower bound of the form t log rho + O(1) which is asymptotically tight (in the stronger sense) and interestingly, this lower bound is identical to the asymptotic delay-limited capacity. The throughputs of MISO and SIMO fading channels are extensively analyzed and it is shown that asymptotically, isotropic Gaussian input is throughput optimal, correlation is detrimental whereas increase in the Rice factor is beneficial and that throughput is schur-concave in the correlation eigenvalues
中断容量和吞吐量是研究延迟敏感无线MIMO链路基本限制的两个关键指标。在本文中,我们证明了这些指标是密切相关的,因此,在中断容量的情况下,对于信道矩阵秩为t且概率为1的一般衰落信道(接收器(CSIR)具有信道状态信息,发射器(CSIT)具有或不具有CSI),具有SNR rho的吞吐量增长率为t log rho。然而,虽然最近对此类信道的中断容量导出了形式为t log rho + 0(1)的渐近紧仿射下界,即中断容量与下界之差的极限rho rrr inin为零,但对于吞吐量来说,这种仿射下界通常是不可能的。然而,使用中断容量的t log + O(1)边界,指定吞吐量的下界,其中吞吐量之比的高信噪比极限与其下界为1。这些边界表明,吞吐量最优中断概率趋近于零。一个重要的例外是在长期功率约束(LTPC)下发射机和接收机都有CSI的情况,对此我们得到了形式为t log rho + O(1)的下界,它是渐近紧密的(在更强的意义上),有趣的是,这个下界与渐近延迟限制容量相同。对MISO和SIMO衰落信道的吞吐量进行了广泛的分析,表明渐近各向同性高斯输入是吞吐量最优的,相关性是有害的,而Rice因子的增加是有益的,吞吐量在相关特征值上是斜凹的
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引用次数: 6
A Capacity-Based Approach for Designing Bit-Interleaved Coded GFSK with Noncoherent Detection 基于容量的位交织编码GFSK非相干检测设计方法
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.262088
R. I. Seshadri, M. Valenti
This paper investigates a capacity-based approach to parameter optimization for energy and bandwidth efficient communication systems. In particular, non-coherently detected, bit-interleaved coded, M-ary Gaussian frequency shift keying (GFSK) is considered. Non-coherent detection is accomplished using a sequential, soft-output (SO), soft-decision differential phase detector (SDDPD). The capacity of the proposed system under modulation, channel and detector design constraints is calculated. For a wide range of spectral efficiencies, the most energy efficient combination of GFSK parameters and code rates is identified using information theoretic bounds on reliable signaling. The information outage probabilities under modulation and detector design constraints are calculated for the block fading channel. Select results reveal that the capacity-based approach also helps in identifying the combination of modulation parameters and code rates with the lowest outage probabilities in block fading
本文研究了一种基于容量的能量和带宽高效通信系统参数优化方法。特别考虑了非相干检测、位交错编码、高斯频移键控(GFSK)。非相干检测使用顺序、软输出(SO)、软判决差分相位检测器(SDDPD)完成。计算了该系统在调制、信道和检测器设计约束下的容量。对于广泛的频谱效率,使用可靠信号的信息理论边界来确定GFSK参数和码率的最节能组合。计算了分块衰落信道在调制和检测器设计约束下的信息中断概率。选择结果表明,基于容量的方法还有助于确定调制参数和码率的组合,并且在块衰落中具有最低的中断概率
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引用次数: 1
Worst-case Analysis of the Low-complexity Symbol Grouping Coding Technique 低复杂度符号分组编码技术的最坏情况分析
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.262028
A. Said
The symbol grouping technique is widely used in practice because it allows great reductions on the complexity of entropy coding symbols from large alphabets, at the expense of small losses in compression. While it has been used mostly in an ad hoc manner, it is not known how general this technique is, i.e., in exactly what type of data sources it can be effective. We try to answer this question by searching for worst-case data sources, measuring the performance, and trying to identify trends. We show that finding the worst-case source is a very challenging optimization problem, and propose some solution methods that can be used in alphabets of moderate size. The numerical results provide evidence confirming the hypotheses that all data sources with large number of symbols can be more efficiently coded, with very small loss, using symbol grouping
符号分组技术在实践中得到了广泛的应用,因为它可以以很小的压缩损失为代价,大大降低从大字母中编码符号的熵的复杂性。虽然它主要以一种特别的方式使用,但不知道这种技术有多普遍,也就是说,它在哪种类型的数据源中是有效的。我们试图通过搜索最坏情况的数据源,测量性能,并试图确定趋势来回答这个问题。我们证明了寻找最坏情况源是一个非常具有挑战性的优化问题,并提出了一些可以用于中等大小字母的解决方法。数值结果证明,使用符号分组可以更有效地编码所有具有大量符号的数据源,并且损失很小
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引用次数: 1
Difference Sampling Theorems For a Class of Non-Bandlimited Signals 一类非带限信号的差分采样定理
Pub Date : 2006-07-09 DOI: 10.1109/ISIT.2006.261687
Chen Meng, J. Tuqan
We consider the reconstruction of a class of continuous time non bandlimited signals from its samples and their differences. The set of samples and their differences is obtained from an oversampled sequence of the underlying continuous time signal. This sequence is in turn modeled as the output of a discrete time multirate interpolation filter. Using this model, we propose a general structure to retrieve the continuous time signal and derive corresponding mathematical conditions for its reconstruction using FIR digital filters. The use of FIR filtering is desired to guarantee the stability of the reconstruction process
研究了一类连续时间非带限信号的采样重构及其差异。该采样集及其差异是由底层连续时间信号的过采样序列获得的。该序列依次建模为离散时间多速率插值滤波器的输出。利用该模型,我们提出了一种检索连续时间信号的一般结构,并推导了用FIR数字滤波器重建连续时间信号的相应数学条件。为了保证重建过程的稳定性,需要使用FIR滤波
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引用次数: 2
期刊
2006 IEEE International Symposium on Information Theory
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