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检索条件"主题词=Modulation Coding"

共 7216 条记录，以下是571-580 订阅

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CQI-report optimization for multi-mode MIMO with unitary codebook based precoding

CQI-report optimization for multi-mode MIMO with unitary cod...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Helka-Liina Määttänen Olav Tirkkonen Timo Roman Helsinki University of Technology Finland Nokia Research Center Helsinki University of Technology Finland Nokia Devices

ISBN: (纸本)9781424451227

In this paper we consider the CQI reporting problem in MIMO downlink with adaptive switching between single user and multiuser mode and finite rate feedback. The feedback consist of channel directional information, which is the precoding weight, and channel quality information, which is a quantized value of estimated post processing SINR. The quantization of the channel directional information causes multiuser interference so that the post processing SINR after a linear receiver in multiuser mode is considerably different from the SINR in single user mode. The accuracy of the channel quality information plays a relevant role for adaptive modulation and coding. In order to achieve good performance without increasing feedback load by reporting accurate channel quality for both modes, we consider differential reporting for the multiuser mode. We optimize the channel quality reporting by considering an optimum differential quantization between single user and multiuser SINR.

关键词： MIMO Feedback Signal to noise ratio Downlink Base stations Quantization modulation coding Transmitters Receiving antennas Throughput

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Capacity of constrained sequence codes modelled by two-dimensional finite state machines with nearest-neighbour connections

Capacity of constrained sequence codes modelled by two-dimen...

引用

Canadian Workshop on Information Theory (CWIT)

作者： Craig Jamieson Ivan Fair Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

Constrained sequence codes are widely used to help meet constraints imposed by digital storage and communication systems. This paper presents a straightforward approach to evaluate the capacity of constrained sequence codes that are modelled by a two-dimensional finite state machine (FSM) with nearest-neighbour connections. Starting with the equivalent one-dimensional constraint, we show how the eigenvalues of the resulting connection matrix increase as the size of the second dimension is increased. Further, we demonstrate how this knowledge can be applied to code design, in that with a given capacity in mind, the code designer is able to determine the set of two-dimensional constraints that will meet this capacity.

关键词： Automata Eigenvalues and eigenfunctions Circuits Logic modulation coding Data storage systems Decoding Joining processes Equations

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Achievable Rates of Coded Linear Systems with Iterative MMSE Detection

Achievable Rates of Coded Linear Systems with Iterative MMSE...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Xiaojun Yuan Li Ping Department of Electronic Engineering City University of Hong Kong Hong Kong China

We extend the area property to more general linear channel models (including inter-symbol-interference (ISI) and multiple-input multiple-output (MIMO) systems) with arbitrary input constellations. We show that the theoretical limit of a channel (i.e., the mutual information) can be achieved under some assumptions. Several engineering techniques are examined to ensure these assumptions. It is shown that the required assumptions can be approximately materialized using superposition coded modulation (SCM) and a preceding technique.

关键词： Linear systems MIMO Intersymbol interference Detectors Mutual information Parity check codes modulation coding Iterative decoding Convergence Additive white noise

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A Signal-Time coding Approach to Relay Networks

A Signal-Time Coding Approach to Relay Networks

引用

International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Pingyi Fan Khaled Ben Letaief Department of Electronic Engineering Tsinghua University Beijing P.R. China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong China

In this paper, we first investigate the network information flow over a relay network topology and find that the reliable achievable information rate is beyond the achievable upper bound using the conventional encoding/modulation techniques when the relay and the destination are with carrier sensing. We then propose a signal-time coding approach which combines the traditional encoding/modulation mode in the signal domain with the signal pulse phase modulation in time domain. Such a hybrid signal-time coding approach can be considered as an integrated codec/modem processing in the two dimensional combinatorial space: Signal domain and temporal domain. The main feature of the proposed signal-time coding is that one can separately design the codec/modem in the signal domain and in the time domain. Therefore, the well known efficient codec/modems, such as LDPC, Turbo coding, TCM etc. in the signal domain can be employed here. A tight lower bound is explicitly presented for the signal phase coding/modulation efficiency in the time domain. In addition, we also present an iterative method to construct the code book for the signal phase coding/modulation in the time domain. Finally, consider its applications in the additive white Gaussian noisy (AWGN) relay networks and obtain some interesting results.

关键词： Relays Phase modulation modulation coding Codecs Modems Encoding Pulse modulation Signal processing AWGN Network topology

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A novel symbol-interleaved Serially Concatenated Overlapped Multiplexing system

A novel symbol-interleaved Serially Concatenated Overlapped ...

引用

Workshop on Power Electronics and Intelligent Transportation System, PEITS

作者： Suhua Zhou Li Fang Daoben Li School of information and communication engineering Beijing University of Posts and Telecommunications Beijing China

Serially Concatenated Overlapped Code Division Multiplexing (SC-OVCDM) system was presented. In this system, for input of OVCDM can be arbitrary modulated symbol, Trellis-coded modulation (TCM) code is firstly employed as outer code, OVCDM code with short constraint length is inner code, a symbol interleaver serially concatenates them. We employ serially nonbinary iterative decoding in the receiver. Symbol-wise Extrinsic Information Transfer chart (EXIT) is used to analyze convergence property of SC-OVCDM system, based on EXIT we propose a search algorithm to look for optimal inner code. Performance of obtained SC-OVCDM system on the AWGN channel is simulated, and compared to three systems with same spectral efficiency including turbo code in Long Term Evolution. Simulation results show proposed search algorithm can accurately estimation cliff threshold of SC-OVCDM. At bit error rate level of 10 -5 , SC-OVCDM system with short frame length can obtain 0.3 dB, 2.5 dB and 6 dB coding gain respectively.

关键词： Concatenated codes modulation coding Code division multiplexing Iterative decoding Information analysis Algorithm design and analysis Convergence Iterative algorithms AWGN channels Turbo codes

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Capacity optimization in systems with AMC

Capacity optimization in systems with AMC

引用

IEEE Signal Processing and Communications Applications (SIU)

作者： Gunes Karabulut Kurt Tolga Kurt Applied Research and Technologies Turkcell İletişim Hizmetleri A. Ş Turkey AirTies Kablosuz İletişim A.Ş. Turkey

Capacity of systems using single modulation type can be calculated in a semi-deterministic fashion. However, for systems with adaptive modulation and coding, the capacity is also dependent on the distribution of modulations and traffic beneath these distributions. In order to utilise the network resources effectively, the areas with higher traffic should be covered with higher order modulation that can provide higher throughput levels. In this work, an optimization metric is proposed for utilization of the systems with adaptive modulations. The proposed metric, by making use of the coverage areas of specific modulations and the traffic demand beneath them; will be an important tool in the optimization procedures of systems that support multi-level modulations such as 3G and 4G.

关键词： WiMAX Adaptive systems modulation coding Telecommunication traffic Research and development GSM Throughput Long Term Evolution Quadrature amplitude modulation

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Cross-Layer-Optimized User Grouping Strategy in Downlink Multiuser MIMO Systems

Cross-Layer-Optimized User Grouping Strategy in Downlink Mul...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Tomoya Tandai Hiroki Mori Masahiro Takagi Corporate Research & Development Center Toshiba Corporation Kawasaki Japan

This paper proposes a cross-layer-optimized user selection and packet transmission technique for the downlink multi-user (MU) multiple-input multiple-output (MIMO) system in IEEE 802.11 wireless LAN (WLAN). In IEEE 802.11 WLAN, packet duration is decided by a data size and a selected transmission mode (modulation and coding scheme, MCS), and therefore, in general, the packet duration of each user varies according to the channel conditions and the applications. If multiple users whose packet durations are considerably different are selected as the target of the downlink MU-MIMO transmission, then the efficiency of spatial multiplexing degrades and the network throughput cannot be enhanced. When selecting users as the target of the downlink MU-MIMO transmission, the degree of spatial channel correlation among users (from the viewpoint of the physical layer) and the packet waiting times in a queue (from the viewpoint of the MAC layer) have to be considered. In addition to these criteria, in IEEE 802.11 WLAN, uniformity of the packet durations among users has to be considered as a criterion. In the proposed method, data size is adjusted in order to make the packet durations of the users uniform after selecting the users based on the spatial compatibility and the packet waiting times. This means that the proposed downlink MU- MIMO transmission is optimized in 3 dimensions by the cross- layer approach: the spatial channel correlations, packet waiting times and the uniformity of the packet durations. Computer simulations are performed and the results show the effectiveness of the proposed method.

关键词： Downlink MIMO Wireless LAN Physical layer Throughput Channel state information Channel capacity modulation coding Optimization methods Scheduling algorithm

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On energy efficient cross-layer assisted resource allocation in multiuser multicarrier systems

On energy efficient cross-layer assisted resource allocation...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Qing Bai Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universität München Germany

In this paper the quality of service (QoS) constrained radio resource allocation problem at the downlink of a multiuser multicarrier system is investigated. We demonstrate and analyze the trade-off between energy consumption and transmit power within a cross physical and link layer system model, which jointly considers power allocation, adaptive modulation and coding and ARQ/HARQ retransmission protocols. A novel transmit power constrained energy minimization problem is formulated based on the competing nature of the two resources. Due to the combinatorial property of the problem, a suboptimal heuristic resource allocation algorithm is proposed, the accuracy of which is compared with the dual optimal value obtained as a byproduct of the algorithm. Simulation results also provide performance comparisons on ARQ and HARQ protocols, and their different impacts on the choice of the optimal modes of operations.

关键词： Energy efficiency Resource management Quality of service Automatic repeat request Protocols Downlink Energy consumption Power system modeling modulation coding Heuristic algorithms

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Receiver implementation for MIMO-OFDM with AMC and precoding

Receiver implementation for MIMO-OFDM with AMC and precoding

引用

Asilomar Conference on Signals, Systems & Computers

作者： Johanna Ketonen Markku Juntti Joseph R. Cavallaro Centre of Wireless Communications University of Oulu Finland Department of Electrical & Computer Engineering Rice University Houston TX USA

ISBN: (纸本)9781424458257

Receivers for horizontally encoded LTE based MIMO-OFDM systems are considered in this paper. Adaptive modulation and coding (AMC) is used as well as precoding. The linear minimum mean square error (LMMSE), successive interference cancellation (SIC) and K-best list sphere detectors (LSD) are compared. The receivers were designed and implemented for 2×2 and 4×4 antenna systems and meet the decoding rate requirement in LTE, i.e, 210 Mb/s in 2×2 and 405 Mb/s in 4×4 antenna systems. The results show that the performance of the receivers is similar in low SNR but the performance difference increases when a higher rank transmission is used. The K-best LSD has the highest performance and complexity. A simpler receiver could be used in the low SNRs to save power and a more complex receiver in the high SNRs when a higher goodput is needed.

关键词： Detectors MIMO Interference cancellation Receiving antennas OFDM Silicon carbide Decoding Signal detection modulation coding Mean square error methods

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Double binary turbo coding for BPPM-TH and BPAM-DS UWB systems

Double binary turbo coding for BPPM-TH and BPAM-DS UWB syste...

引用

IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Eun Cheol Kim Jin Young Kim Wireless Communications Engineering Kwangwoon University Seoul South Korea

In this paper, performance of binary pulse position modulation-time hopping (BPPM-TH) and the binary pulse amplitude modulation-direct sequence (BPAM-DS) ultra wide band (UWB) systems with a double binary turbo code is analyzed and simulated in an indoor wireless channel. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel. The performance is evaluated in terms of bit error probability (BER). From the simulation results, it is seen that double binary turbo coding offers considerable coding gain with reasonable encoding complexity. It is also demonstrated that the performance of the UWB system can be substantially improved by increasing the number of iterations.

关键词： Turbo codes Pulse modulation Amplitude modulation Decoding Wireless communication modulation coding Error correction codes Bandwidth AWGN Multiaccess communication

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