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检索条件"主题词=adaptive modulation and coding"

共 320 条记录，以下是231-240 订阅

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Link Adaptation Control in LTE Uplink

Link Adaptation Control in LTE Uplink

引用

76th IEEE Vehicular Technology Conference (VTC Fall)

作者： Bertrand, Pierre Jiang, Jing Ekpenyong, Anthony Texas Instruments Inc Villeneuve France Texas Instruments Inc Dallas TX USA

ISBN: (纸本)9781467318792

Long Term Evolution (LTE) technology aims at addressing the increasing demand for mobile multimedia services in high user density areas. Channel aware scheduling across wide system bandwidth is one of the key techniques enabling this goal. To this end, the LTE scheduler heavily relies on an accurate and robust Link Adaptation (LA) function for predicting the best modulation and coding scheme (MCS) of a user. In this paper, we complement the popular block error rate (BLER) based LA with a scheme maximizing the throughput without BLER constraint and show that it indeed optimizes the spectral efficiency performance. We also describe a sub-optimal UL scheduler providing a good performance/complexity trade-off between a low-complexity basic scheduler and the optimal, but impractical complexity-wise.

关键词： LTE E-UTRAN link adaptation adaptive modulation and coding scheduler OFDM

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Effective SINR mapping for an MC-CDMA system

Effective SINR mapping for an MC-CDMA system

引用

5th International Workshop on Multi-Carrier Spread-Spectrum (MC-SS 2005)

作者： Elliott, Robert Arkhipov, Alexander Raulefs, Ronald Krzymien, Witold A. Univ Alberta TRLabs Edmonton AB Canada German Aerosp Ctr DLR Oberpfaffenhofen Germany

ISBN: (纸本)1402044356

One technique employed by modem cellular systems to increase throughput and reduce errors is the use of hybrid automatic repeat request (H-ARQ) schemes to retransmit packets that are in error. adaptive modulation and coding can also be used between transmissions to adjust to the channel conditions for each transmission. However, multiple transmissions and modulation formats lead to a large number of possible combinations for which we need to determine the performance. Effective SINR mapping is a method to map the various combinations into a smaller group of reference states (e.g. a constant modulation and AWGN channel for all transmissions). Previous work has focused on the single-carrier, constant-modulation case in flat fading. In this work, we examine how to perform SINR mapping in a multi-carrier CDMA system with adaptive modulation and frequency-selective fading.

关键词： SINR mapping adaptive modulation and coding multi-carrier CIDNIA hybrid ARQ

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System-Level Performance of Downlink NOMA Combined with SU-MIMO for Future LTE Enhancements

System-Level Performance of Downlink NOMA Combined with SU-M...

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Benjebbour, Anass Li, Anxin Kishiyama, Yoshihisa Jiang, Huiling Nakamura, Takehiro NTT DOCOMO INC Radio Access Network Dev Dept Tokyo Tokyo Japan DOCOMO Beijing Commun Labs Co Ltd Beijing Peoples R China

ISBN: (纸本)9781479974702

This paper investigates the system-level performance of downlink non-orthogonal multiple access (NOMA) combined with single user MIMO (SU-MIMO) for future LTE (Long-Term Evolution) enhancements. The goal is to clarify the performance gains of NOMA combined with SU-MIMO transmission, taking into account the LTE radio interface such as frequency-domain scheduling, adaptive modulation and coding (AMC), and NOMA specific functionalities such as multi-user pairing/ordering and transmit power allocation. In particular, we propose practical schemes to efficiently combine NOMA with open-loop SU-MIMO (Transmission Mode 3: TM3) and closed-loop SU-MIMO (Transmission Mode 4: TM4) specified in LTE. Based on computer simulations, we compare NOMA performance gains for different granularities of scheduling and MCS (modulation and coding scheme) selection, for both genie-aided channel quality information (CQI) estimation and approximated CQI estimation, and using different number of power sets. Evaluation results show that NOMA can still provide a hefty portion of its expected gains even with approximated CQI estimation and limited number of power sets, and also when LTE compliant subband scheduling and wideband MCS are applied.

关键词： LTE NOMA MIMO superposition successive interference cancellation adaptive modulation and coding

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Machine Learning Assisted Caching and adaptive LDPC Coded modulation for Next Generation Wireless Communications 11

Machine Learning Assisted Caching and Adaptive LDPC Coded Mo...

引用

17th International Joint Conference on E-Business and Telecommunications (SECRYPT)

作者： Nooh, Hassan Zhu, Zhikun Ng, Soon Xin Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

ISBN: (纸本)9789897584459

Unmanned Aerial Vehicles (UAVs) constitute a key technology for next generation wireless communications. Compared to terrestrial communications, wireless systems with low-altitude UAVs are in general faster to deploy, more flexible and are likely to have better communication channels due to the presence of short-range Line of Sight (LoS) links. In this contribution, a Latent Dirichlet Allocation (LDA) based machine learning algorithm was utilized to optimize the content caching of UAVs, while the K-means clustering algorithm was invoked for optimizing the assignment of mobile users to the UAVs. We further investigated a practical adaptive Low Density Parity Check (LDPC) coded modulation (ALDPC-CM) scheme for the communication links between the UAVs and the users. We found that the caching efficiency of each UAV can be boosted from 50% with random caching to above 90% with the employment of LDA. We also found that the proposed ALDPC-CM scheme is capable of performing closely to the ideal perfect coding based scheme, where the mean delay of the former is only about 0.05 ms higher than that of the latter, when the UAV system aims to minimize both the transmission and request delays.

关键词： Low Density Parity-check Codes Latent Dirichlet Allocation adaptive modulation and coding K-Means Clustering

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Impact of Varying Wireless channel on the Performance of LEO Satellite Communication System 12

Impact of Varying Wireless channel on the Performance of LEO...

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12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON)

作者： Rahman, Mogbonjubola Walingo, Tom Takawira, Fambirai Univ KwaZulu Natal Sch Elect Elect & Comp Engn Durban South Africa Univ Witwatersrand Sch Elect Elect & Comp Engn Johanessburg South Africa

ISBN: (纸本)9781479974986

The impact of varying wireless channel on the performance of handover scheme in Low Earth Orbit (LEO) satellite systems operating in different propagation environments, is analytically presented in this work. Generally LEO mobile satellite systems are adversely affected by diverse impairing factors like shadowing and multipath fading which increases the rate of handover failure and blocking of new connections. In essence, this work proposes to adopt the concept of adaptive modulation and coding (AMC) operating at two different transmission rates that suit the channel states of the network Futhermore, a study of the performance of LEO satellite network in three different propagation environment is presented. In addition, the effect of channel variation on the overall transmission time for these environments is shown by analytical performance measures. The performance metrics considerd for this analysis are the blocking probability of new call attempts (P-b1), handover failure probability due to lack of available resources in the destination cell of the mobile (P-b2), call dropping probability due to an unsuccessful handoff (P-drop) and unsuccessful call probability (P-drop)

关键词： adaptive modulation and coding Blocking Probability Channel Call Dropping handover failure Multipath Fading Shadowing

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An Finite-State Markov Channel Model for ACM Scheme in WiMAX

An Finite-State Markov Channel Model for ACM Scheme in WiMAX

引用

IEEE Region 10 Conference 2009

作者： Vu, Xuan-Thang Nguyen, Dinh-Thong Vu, Trinh Anh Vietnam Natl Univ Coll Technol Hanoi Vietnam Univ Technol Sydney Fac Engn Sydney NSW Australia Univ Technol Sydney IT Sydney NSW Australia

ISBN: (纸本)9781424445462

The paper derives a more accurate upper bound for BER for M-QAM than is currently used in the literature. This allows a more thorough analysis of the power adaptation to fading conditions for optimization of spectral efficiency. By taking into account the effect of error coding gain on power adaptation, a 7-state FSMC model for the implementation of the adaptive modulation and coding scheme in WiMAX is proposed.

关键词： Wireless communications WiMAX adaptive modulation and coding Finite state Markov channel model

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Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks

Effects of Link Rate Assignment on the Max-Min Fair Throughp...

引用

21st International Teletraffic Congress (ITC)

作者： Staehle, Barbara Staehle, Dirk Pries, Rastin Univ Wurzburg Inst Comp Sci Wurzburg Germany

ISBN: (纸本)9781424447442

Wireless mesh networks (WMNs) support a variety of modulation and coding schemes (MCSs) and hence enable adaptive modulation and coding. On the one hand, adaptive modulation and coding significantly increases the overall system capacity, as it allows to maximize the throughput on each link in dependence of the channel conditions. On the other hand, there is a trade-off between link data rate and spatial reuse, as high data rate links are less robust against interference. For maximizing the wireless mesh network performance, an intelligent link rate assignment strategy is thus required. By evaluating the max-min fair WMN throughput under different link rate assignment strategies, we are able to show that using more robust MCSs improve the overall WMN throughput and point out directions towards an optimized MCS choice.

关键词： Wireless Mesh Networks adaptive modulation and coding Max-Min Fairness Planning

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Optimization of Group Layered Multi-Antenna Architectures with LDPC Codes

Optimization of Group Layered Multi-Antenna Architectures wi...

引用

69th IEEE Vehicular Technology Conference

作者： Lee, Hyo-Jin Shin, Dong-Min Yang, Kyeongcheol Pohang Univ Sci & Technol POSTECH Dept Elect & Elect Engn Pohang 790784 Kyungbuk South Korea

ISBN: (纸本)9781424425167

Group layered multi-antenna architectures (GLAs) employing orthogonal space-time block codes and spatial multiplexing techniques may simultaneously exploit diversity and multiplexing gains with simple decoding algorithms based on successive interference cancellation (SIC). In this paper we first describe a decoding method of a SIC receiver based on QR decomposition in a GLA using LDPC codes, and then find a combination of code rate and modulation order which optimizes the asymptotic performance of the GLA. Simulation results show that the performance of the GLA using code rates and modulation orders found by our method is better by 2 dB than that of a GLA using the same code rate and modulation order in all layers. Our optimization method can be applied to adaptive modulation and coding schemes for GLAs.

关键词： adaptive modulation and coding low-density parity-check code space-time block codes spatial multiplexing

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Study of channel quality feedback in UMTS HSDPA

Study of channel quality feedback in UMTS HSDPA

引用

14th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Fukui, N Mitsubishi Elect ITE Telecommun Res Lab Rennes France

ISBN: (纸本)7505350668

As UMTS enhancement function, High Speed Downlink Packet Access (HSDPA) was specified in 3GPP in year 2002. This enhanced system supplies higher packet data rate on the downlink. One of the key techniques supporting HSDPA is adaptive modulation and coding (AMC) that the modulation scheme and the coding rate for error correction are adaptively changed according to the radio channel condition. Therefore, the channel quality information dominates the accuracy of AMC and affects the system performance. In current 3GPP specification release 5, periodic channel quality feedback by the UE is defined. However, the coexistence of high throughput and low uplink interference isn't easy. This paper proposes the additional feedback scheme in addition to current scheme to aim at the coexistence of such system performance. After the description of this proposal, the throughput performance on the downlink, the interference situation on the uplink and the error probability of the retransmission are shown. This proposal scheme has been proposed as further enhancement technique of HSDPA for specification release 6.

关键词： UMTS HSDPA adaptive modulation and coding channel quality feedback

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Performance of Cooperative Relaying with adaptive modulation and Selection Combining

Performance of Cooperative Relaying with Adaptive Modulation...

引用

International Conference on Computing, Networking and Communications (ICNC)

作者： Song, Wei Ju, Peijian Zhou, Dizhi Univ New Brunswick Fac Comp Sci Fredericton NB E3B 5A3 Canada

ISBN: (纸本)9781467300094;9781467352871

Taking advantage of the broadcast nature of wireless medium, a relay node can forward an overheard signal from the source to enhance the receiving quality. Many previous studies on cooperative relaying focus on maximal ratio combining (MRC) to exploit the spatial diversity. However, it is complex to enable different modulation levels with MRC so as to better address varying channel conditions. There has been some existing work on the performance of cooperative relaying with selection combining (SC). In this paper, we further consider adaptive modulation and coding (AMC) in a cooperative relaying scenario with selection combining. Based on the bit error rate (BER) analysis, the minimum signal-to-noise ratio (SNR) thresholds are determined to activate different modulation modes at the relay node, such that the overall BER at the destination is no greater than a target BER constraint. Simulations are conducted to verify the accuracy of the BER analysis. The numerical results demonstrate the performance gain of cooperative relaying with adaptive modulation and selection combining.

关键词： Cooperative communications relay selection combining adaptive modulation and coding

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