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Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152)最新文献

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Reduced complexity of multi-code DS-CDMA receiver using a COF only for pilot channel in forward link 在前向链路中,仅对导频信道使用COF降低了多码DS-CDMA接收机的复杂度
S. Suwa, T. Saba, M. Ariyoshi, I. Sasase
We propose a multi-code DS-CDMA receiver with reduced complexity in the forward link. The proposed receiver uses a code orthogonalizing filter (COF) only for the pilot channel. We compare the bit error rate (BER) performance of the proposed receiver with that of the receiver with COFs for all channels by computer simulations. The results show the proposed receiver achieves reduced hardware complexity without serious performance degradation.
我们提出了一种多码DS-CDMA接收机,降低了前向链路的复杂度。该接收机仅对导频信道使用码正交化滤波器(COF)。我们通过计算机模拟比较了所提出的接收机与所有信道的COFs接收机的误码率(BER)性能。结果表明,该接收机在不造成严重性能下降的情况下降低了硬件复杂度。
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引用次数: 0
Bit error probability of M-ary quadrature amplitude modulation M-ary 正交振幅调制的比特误差概率
D. Yoon, Kyongkuk Cho, Jinsock Lee
So far the general expression of bit error rate (BER) has not been derived for M-ary square quadrature amplitude modulation (QAM). In this paper, a generalized closed-form BER expression of M-ary square QAM with Gray code bit mapping is derived and analyzed in the presence of additive white Gaussian noise (AWGN) channel.
迄今为止,尚未推导出 M-ary 平方正交振幅调制(QAM)的误码率(BER)的一般表达式。本文推导并分析了在存在加性白高斯噪声(AWGN)信道的情况下,具有格雷码位映射的 M-ary Square QAM 的广义闭式误码率表达式。
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引用次数: 99
Multicarrier CDMA systems with transmit diversity 具有发射分集的多载波CDMA系统
Xiaodong Cai, A. Akansu
Transmit diversity was previously proposed to reduce the detrimental effects in fading channels. In this paper we apply the space-time block codes to multicarrier CDMA systems. Our emphasis is on designing receivers that can decode the space-time codes and suppress the multiple access interference. Among the four detecting schemes we propose the minimum mean square error combiner (MM-SEC) give the best tradeoff between performance and complexity. Simulation results show that MC-CDMA systems with transmit diversity have a much better performance than MC-CDMA systems without transmit diversity in multipath fading channels.
以前提出发射分集是为了减少衰落信道中的有害影响。本文将空时分组码应用于多载波CDMA系统。我们的重点是设计能够解码空时码和抑制多址干扰的接收机。在四种检测方案中,最小均方误差组合(MM-SEC)在性能和复杂度之间取得了最好的平衡。仿真结果表明,在多径衰落信道中,带发射分集的MC-CDMA系统比不带发射分集的MC-CDMA系统具有更好的性能。
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引用次数: 52
Adaptive successive interference cancellation for the IS-95 uplink IS-95上行链路的自适应连续干扰消除
Kuei-Chiang Lai, J. Shynk, M. Motamed, R. Gooch
In this paper we examine an adaptive successive interference canceler (ASIC) that can separate direct-sequence code-division-multiple-access (DS/CDMA) signals for the IS-95 (Interim Standard 95) uplink under near-far conditions, i.e., without power control. The ASIC employs a multistage architecture where each stage consists of a conventional matched filter (MF) detector with equal gain combining (EGC), followed by an adaptive interference canceler (AIC) that is adjusted by the least-mean-square (LMS) algorithm to track time-varying multipath channels. Variants of the basic ASIC architecture which exploit the specific structure of the IS-95 uplink traffic channel are also discussed. The bit-error-rate (BER) performance of the ASIC is compared with that of other interference cancelers, demonstrating the effectiveness of the ASIC for near-far scenarios.
在本文中,我们研究了一种自适应连续干扰消除器(ASIC),它可以在近距离条件下,即没有电源控制的情况下,为IS-95(临时标准95)上行链路分离直接顺序码分多址(DS/CDMA)信号。ASIC采用多级架构,其中每级由具有等增益组合(EGC)的传统匹配滤波器(MF)检测器组成,然后是由最小均方(LMS)算法调整的自适应干扰消除器(AIC),以跟踪时变多径信道。本文还讨论了利用IS-95上行业务通道特定结构的各种基本ASIC架构。将ASIC的误码率(BER)性能与其他干扰消除器进行了比较,证明了ASIC在近距离场景下的有效性。
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引用次数: 5
Comparison of the level crossing rate and average fade duration of Rayleigh, Rice and Nakagami fading models with mobile channel data 基于移动信道数据的Rayleigh、Rice和Nakagami衰落模型的平交率和平均衰落持续时间的比较
A. Abdi, K. Wills, H. A. Barger, Mohamed-Slim Alouini, M. Kaveh
Level crossing rate (LCR) and average fade duration (AFD) of the signal envelope are two important second-order channel statistics, which convey useful information about the dynamic temporal behavior of multipath fading channels. In this paper and for a general non-isotropic scattering scenario, in which the mobile receives signal only from particular directions with different probabilities, we derive expressions for the LCR and AFD of Rayleigh, Rice and Nakagami (1960) fading models, including the effect of non-uniform signal angle-of-arrival distribution. The merits and limitations of all the above models in describing the first- and second-order statistics of multipath fading channels are explored through an extensive comparison of theoretical results with narrowband measurements taken in urban and suburban areas at 910.25 MHz.
信号包络的平交率(LCR)和平均衰落持续时间(AFD)是两个重要的二阶信道统计量,它传递了多径衰落信道动态时间行为的有用信息。在本文中,对于一般的非各向同性散射场景,即手机只接收到来自特定方向的不同概率的信号,我们推导了Rayleigh, Rice和Nakagami(1960)衰落模型的LCR和AFD的表达式,包括信号到达角分布不均匀的影响。通过将理论结果与城市和郊区910.25 MHz窄带测量结果进行广泛比较,探讨了上述所有模型在描述多径衰落信道的一阶和二阶统计量方面的优点和局限性。
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引用次数: 120
DRMA with multiple slots reservation and retransmission algorithm using exponential backoff scheme 多时隙DRMA保留和指数回退重传算法
Y. Komoriya, M. Tadenuma, Y. Nishino, I. Sasase
Dynamic reservation multiple-access (DRMA) has been proposed to improve the spectrum efficiency of the integrated voice and data services. In that protocol, although the fixed reservation overhead is avoidable, a data terminal that transmits a data message with multiple packets has to reserve a slot for each packet transmission. In order to improve the data message delay without degrading the voice packet loss probability, we propose the DRMA with multiple slots reservation as the proposed-1 DRMA. We also propose the DRMA with multiple slots reservation and retransmission algorithm using exponential backoff scheme as the proposed-2 DRMA to further improve the data message delay. By the performance evaluation using computer simulations, we show that the proposed schemes reduce the data message delay without degrading the voice packet loss probability compared to the conventional DAMA.
动态预留多址(DRMA)技术是为了提高话音数据综合业务的频谱利用率而提出的。在该协议中,虽然可以避免固定的保留开销,但是传输带有多个数据包的数据消息的数据终端必须为每个数据包传输保留一个插槽。为了在不降低语音丢包概率的前提下提高数据报文延迟,我们提出了多时隙预留的DRMA作为提议的-1 DRMA。为了进一步改善数据报文延迟,我们还提出了具有多插槽保留的DRMA和使用指数回退方案的重传算法作为提议的2 DRMA。通过计算机仿真的性能评估,我们表明,与传统的DAMA相比,所提出的方案在不降低语音包丢失概率的情况下降低了数据消息延迟。
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引用次数: 0
A blind diversity reception based on eigenfilter approach for mobile communications 移动通信中基于特征滤波方法的盲分集接收
H. Suzuki, Y. Sanada, Rikuhiro Hanai
Diversity systems are very effective for improving signal transmission performance in mobile radio communications. Blind diversity reception utilizing an eigenfilter is proposed and its principle and performance are described. First, analysis on the SNR at the diversity combiner output derives the blind diversity principle. Furthermore, the analysis shows that the problem to maximize signal-to-noise ratio with a constraint condition becomes the one to solve the eigenfilter (the eigenvector associating with the maximum eigenvalue). The power method is employed to calculate this eigenvector. Computer simulations show the eigenfilter convergence characteristics and average bit error rate performance both in static and in fading environments. The simulation demonstrates that the proposed blind diversity system is effective even in the relatively fast fading environments.
在移动无线电通信中,分集系统是提高信号传输性能的有效手段。提出了一种基于特征滤波器的盲分集接收方法,并对其原理和性能进行了描述。首先,对分集组合器输出信噪比进行分析,推导出盲分集原理。进一步分析表明,在约束条件下最大化信噪比的问题变成了求解特征滤波器的问题(与最大特征值相关联的特征向量)。采用幂次法计算该特征向量。计算机仿真显示了该滤波器在静态和衰落环境下的收敛特性和平均误码率性能。仿真结果表明,即使在相对较快的衰落环境下,盲分集系统也是有效的。
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引用次数: 1
Combined temporal and spatial filter structures for CDMA systems 码分多址系统的组合时空滤波器结构
A. Yener, R. Yates, S. Ulukus
CDMA systems are interference limited and therefore efficient interference management is necessary to enhance the capacity of a CDMA system. In this paper we consider combining two effective receiver based interference management strategies: multiuser detection (temporal filtering) and receiver beamforming (spatial filtering). We formulate and examine the performance of several linear filter structures which are all based on minimum mean squared error (MMSE) criteria, but differ in how the MMSE problems are defined in the temporal and spatial domains, i.e., jointly or in cascade. It is shown that while the joint optimum MMSE filter achieves the maximum signal-to-interference ratio (SIR) among all possible linear filters, the constrained optimum MMSE filter which results in a single temporal and single spatial filter outperforms all combined single-user/multiple-user approaches and cascaded optimization approaches either uniformly or asymptotically. The constrained optimum MMSE filter is near-far resistant in all but very highly loaded systems and enjoys low complexity.
CDMA系统受干扰的限制,因此有效的干扰管理是提高CDMA系统容量的必要条件。本文考虑结合两种有效的基于接收机的干扰管理策略:多用户检测(时间滤波)和接收机波束形成(空间滤波)。我们制定并检查了几种线性滤波器结构的性能,这些结构都基于最小均方误差(MMSE)标准,但MMSE问题如何在时间和空间域中定义不同,即联合或级联。结果表明,虽然联合最优MMSE滤波器在所有可能的线性滤波器中实现了最大的信干扰比(SIR),但产生单个时间和单个空间滤波器的约束最优MMSE滤波器均匀或渐近地优于所有组合单用户/多用户方法和级联优化方法。约束最优MMSE滤波器在除高负载系统外的所有系统中都具有近抗远性,并且具有较低的复杂性。
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引用次数: 4
Antenna array using a channel estimation technique in a DS/CDMA system with M-ary orthogonal modulation 基于信道估计技术的正交调制DS/CDMA系统天线阵列
Jeongho Park, Sukhyon Yoon, C. Kang, D. Hong
Adaptive antenna array techniques are known to be good for cancelling multipath and multiuser interference. However, some of them need training signals to estimate the desired signal or have heavy complexity to compute the algorithmic processing. In this paper, we propose an antenna array receiver in a direct sequence/code division multiple access (DS/CDMA) system with M-ary orthogonal modulation. At every antenna a channel estimation technique is used, which refers to the maximum correlator output of a RAKE receiver. The estimated channel coefficients enable coherent detection with no need of training signals. Moreover, the antenna weights, which are determined by the estimated channel coefficients, make it possible to focus the receiver on the desired signal and to suppress the interference signal. Consequently, the proposed receiver has a 2D (dimensions) RAKE structure which can exploit both spatial diversity and temporal diversity. Simulation results show that the performance of the proposed scheme improves 1.5 dB in E/sub b//N/sub o/ at a BER=10/sup -3/ over the receiver of noncoherent detection. The results also show that at a BER=10/sup -2/ the proposed receiver improves about 2.3 times and 3 times the system capacity with 3 and 5 antennas, respectively.
自适应天线阵列技术可以有效地消除多径干扰和多用户干扰。然而,其中一些算法需要训练信号来估计所需的信号,或者计算算法处理的复杂度很高。在本文中,我们提出了一种用于直接序列/码分多址(DS/CDMA)系统的天线阵列接收机。在每个天线信道估计技术被使用,这是指一个RAKE接收机的最大相关器输出。估计的信道系数使相干检测不需要训练信号。此外,由估计的信道系数确定的天线权值使接收机能够聚焦在所需的信号上并抑制干扰信号。因此,所提出的接收器具有二维RAKE结构,可以利用空间多样性和时间多样性。仿真结果表明,在BER=10/sup -3/时,该方案比非相干检测接收机在E/sub / b/ N/sub / o/下的性能提高了1.5 dB。结果还表明,在BER=10/sup -2/时,采用3根天线和5根天线的系统容量分别提高了2.3倍和3倍。
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引用次数: 1
Postdetection diversity receiver for DAPSK signal over the Rayleigh and Rician fading channel 在瑞利和瑞利衰落信道上用于DAPSK信号的检测后分集接收机
Jong Youl Lee, Y. Chung, Sang Uk Lee
A new postdetection maximal ratio combining (MRC) and weighted maximal ratio combining (WMRC) diversity receivers for (N, M) differential amplitude phase shift keying (DAPSK) signal are proposed. In the MRC receiver, decision at each branch is made by the minimum distance criterion. The performance of the MRC receiver is analyzed in terms of the union bound for the bit error probability. The WMRC receiver assigns weighting factors to the decision variable at each diversity branch according to the relative distance from the optimum decision boundary. From the results, performance of the WMRC is found to be better than that of the MRC and equal gain combining (EGC) receiver on both the Rayleigh and Rician fading channel. It is also found that the performance improvement of the WMRC over the MRC increases as the number of the diversity branches increases.
针对(N, M)差幅相移键控(DAPSK)信号,提出了一种新的检测后最大比组合(MRC)和加权最大比组合(WMRC)分集接收机。在MRC接收机中,各支路的决策采用最小距离准则。从误码率的并界角度分析了MRC接收机的性能。WMRC接收器根据与最优决策边界的相对距离,为各分集分支上的决策变量分配权重因子。结果表明,在瑞利和瑞利衰落信道上,WMRC的性能都优于MRC和等增益组合(EGC)接收机。研究还发现,随着分集分支数量的增加,WMRC对MRC的性能改进也会增加。
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引用次数: 1
期刊
Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152)
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