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检索条件"主题词=Modulation coding"

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System-level study of OFDM and CDMA with adaptive modulation/coding for a 5 MHz channel

System-level study of OFDM and CDMA with adaptive modulation...

引用

IEEE Conference on Wireless Communications and Networking

作者： K. Baum P. Sartori V. Nangia Motorola Research Laboratories Schaumburg IL USA

In this paper, the downlink performance of OFDM and CDMA cellular systems is investigated for deployment scenarios similar to those envisioned by the 3GPP. In particular, the system-level performance characteristics are studied for packet data oriented systems with adaptive modulation and coding (AMC), operating on a 5 MHz channel with one-cell frequency reuse. For the CDMA case, both Rake and MMSE receivers are considered. Three link adaptation scenarios are considered: ideal (fast) time-only adaptation, slow link adaptation (based on average C/(I+N)), and ideal time-frequency adaptation (only for OFDM). Performance is evaluated using indicators such as total throughput and data rate profile, for five propagation environments (pedestrian A and B, Vehicular A and B, and GSM typical urban) and for single antenna systems as well as space-time transmit diversity (STTD) systems. Results show a significant performance benefit for fast link adaptation in all systems, and also indicate that OFDM provides a performance benefit that depends on the channel delay spread.

关键词： Multiaccess communication modulation coding OFDM modulation Downlink Adaptive systems RAKE receivers Time frequency analysis Throughput GSM Transmitting antennas

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Research on Threshold Adjustment Algorithm in Adaptive modulation and coding

Research on Threshold Adjustment Algorithm in Adaptive Modul...

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

作者： Fan Chen Chen Meiya Su Lijun Zhang Xin Yang Dacheng School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing China

Adaptive modulation and coding (AMC) has gained a lot of attention in the research of high speed downlink packet access (HSDPA). The idea is to adapt the transmission to the fast changing channel conditions by the use of different modulation and coding schemes (MCS). In this paper, an adaptive algorithm (ITA) is presented for the AMC technique in HSDPA and a theoretical analysis model is introduced to investigate the throughput and FER of ITA. Subject to the given FER target, the numerical and link level simulation results both show that ITA outperforms the adaptive algorithms

关键词： modulation coding Multiaccess communication Algorithm design and analysis Downlink Adaptive algorithm Throughput Power control Error analysis Performance analysis Land mobile radio

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A New Adaptive modulation and coding Applied on a 400-Mbps OFDM Wireless Communication System

A New Adaptive Modulation and Coding Applied on a 400-Mbps O...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Nobuaki Otuski Shingo Yoshizawa Yoshikazu Miyanaga Graduate School of Information and Science Technology Hokkaido University Sapporo Japan

In this report, a new technology of adaptive modulation and coding is proposed. This technique is designed for a cognitive radio system. The proposed technique is implemented into an ultra high speed wireless system. The system has maximum 400 Mbps throughput with 80 MHz bandwidth. It is considered as an expanded model of the standard systems on IEEE 802.11a and 802.11n. When the throughput becomes high such as our designed wireless system, it is not easy to keep its throughput high enough under various circumstances. In order to obtain the optimum throughput under these circumstances, the proposed technique determines adaptively the specification of modulation and coding where several specifications of modulation can be designed and can be adaptively selected in our system. This report presents its evaluation of our proposed techniques. It is shown that the optimum condition is usually obtained in our system

关键词： modulation coding OFDM modulation Wireless communication Throughput MIMO Cognitive radio Bandwidth Radio transmitters Wireless LAN Diversity methods

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Velocity estimation using WCDMA uplink signal for adaptive modulation and coding in HSDPA system

Velocity estimation using WCDMA uplink signal for adaptive m...

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Asia-Pacific Conference on Communications

作者： Seong-Jun Kim Young-Yong Lee Hyung-Jin Choi School of Information and Communications Engineering SungKyunKwan University Suwon Gyeonggi South Korea Telecommunication R&D Center Information & Communication Business Samsung Electronics Company Limited Suwon Gyeonggi South Korea

ISBN: (纸本)0780381149

High speed downlink packet access (HSDPA) is the packet-based data service with data transmissions up to 10 Mbps in WCDMA downlink. For HSDPA, adaptive modulation and coding (AMC) provides the flexibility to match the modulation and coding scheme to the average channel conditions for each user to raise the overall system capacity. There are many methods to estimate the channel quality, and the measurement of the mobile velocity is available for AMC. In this paper, the mobile velocity estimator using W-CDMA uplink signal for HSDPA is proposed. The proposed velocity estimator has robust pre-filter and post-filter to reduce noise influence. And the proposed velocity estimator also has observation block to estimate velocity more accurately under added noise.

关键词： modulation coding Multiaccess communication Downlink Frequency estimation Base stations Power control Data communication Noise robustness Noise reduction MIMO

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Asymmetric modulation and multistage coding for multicasting with multi-level reception over fading channels

Asymmetric modulation and multistage coding for multicasting...

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MILCOM, Military Communications Conference

作者： M.M. Khairy E. Geraniotis Department of Electrical Engineering and Institute for Systems Research University of Maryland College Park MD USA

We investigate the application of joint iterative decoding and channel estimation for the transmission of multilevel coded signals using asymmetric QPSK modulation over flat Rayleigh fading channels. The goal is the transmission of multiresolution data streams to receivers with multi-level reception capabilities. We consider two types of receivers: the receivers in the first class can decode only the most significant bit (MSB) of the transmitted information; the receivers in the second class decode both the MSB and the LSB (least significant bit). Symbol aided demodulation (SAD) is used according to which known symbols are inserted in the encoded data stream to assist in the channel estimation process. Furthermore, an iterative algorithm is proposed that uses soft decoding information in addition to the information contained in the known symbols to improve the estimation of the fading channel. Simulation results show significant performance gains of the new scheme over both differential demodulation and conventional SAD.

关键词： modulation coding Fading Demodulation Iterative decoding Channel estimation Signal resolution Quadrature phase shift keying Image resolution Protection Educational institutions

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Digital modulation and coding for mobile communications

Digital modulation and coding for mobile communications

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European Conference on Electrotechnics, Conference Proceedings on Area Communication, EuroCON

作者： A.A. Ali King Saud University Riyadh Saudi Arabia

M-ary phase shift-keying (MPSK) and M-ary frequency-shift-keying (MFSK) are compared for transmission over a Rayleigh faded radio channel of limited bandwidth. Both diversity and coding improvements are assessed for coupling with the M-ary signal alphabet. It is shown that phase modulation, with coherent or differentially coherent detection, outperforms orthogonal MFSK signalling if both power and bandwidth are constrained. It is also shown that the use of lower-alphabet MFSK with a higher-order diversity is more advantageous than the use of higher-ary modulation. Some situations are exhibited in which a comparable performance can be obtained by an increase in signal alphabet or diversity; the choice of modulation and coding format depends on the relative complexity of higher-ary modulation compared to increasing the order of diversity.< >

关键词： Digital modulation Mobile communication Bandwidth Telephony Rayleigh channels Error probability modulation coding Land mobile radio Information rates Signal to noise ratio

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Aggressive modulation/coding scheme selection for maximizing system throughput in a multi-carrier system

Aggressive modulation/coding scheme selection for maximizing...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： A. Talukdar P. Sartori M. Cudak B. Classon Y. Blankenship Motorola Research Laboratories Schaumburg IL USA

Multi-carrier modulation techniques, such as OFDM, are attractive propositions for the design of future broadband wireless communication systems due to higher spectral efficiency than CDMA. A capacity enhancing technique to be commonly used in these systems is adaptive modulation/coding (AMC) for link adaptation. With AMC, the modulation and coding scheme (MCS) is selected based on the channel quality information. MCS selection is an imperfect process by nature, due to, for example, the variability of the channel. Moreover, since the set of available MCSs is quantized, it is not always possible to select the optimal rate. Using these non-optimal MCS values results in reduced system capacity. This paper describes a method that attempts to maximize system and user throughputs in a multi-carrier system by overcoming the impacts of such non-optimal MCS selection through the use of hybrid ARQ (HARQ). This method relies on aggressive MCS selection and multiple HARQ transmissions. The performance impact of this method on various types of packet data applications is evaluated by system level simulation. Simulation results indicate that significant system and user throughput gains can be achieved by this method.

关键词： modulation coding Throughput OFDM modulation Multiaccess communication Automatic repeat request Broadband communication Wireless communication Adaptive systems Programmable control Adaptive control

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An integrated subchannel scheduling algorithm for adaptive modulation and coding (AMC) MIMO-OFDM wireless systems

An integrated subchannel scheduling algorithm for adaptive m...

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Asia-Pacific Conference on Communications

作者： Lei Li Zhisheng Niu Department of Electronic Engineering Tsinghua University Beijing China

We develop an integrated subchannel scheduling algorithm to maximize the system throughput while guaranteeing minimum data rate requirements for multimedia users in multiuser MIMO-OFDM systems downlink transmission utilizing adaptive modulation and coding (AMC) with limited channel state information feedback. By using the integrated subchannel scheduling, we apply the mathematical equivalence between antennas and subcarriers in the analysis, getting multiple parallel transmit subchannels, and then evaluating the channel state from the viewpoint of receivers. Joint space-frequency diversity as well as multiuser diversity is exploited simultaneously by the subchannel allocation algorithm. A modified proportional fair scheduling is proposed and a fast algorithm for more practical implementation is also proposed. By numerical examples, the system throughput and fairness superiority of our scheduling scheme are verified.

关键词： Scheduling algorithm modulation coding MIMO Resource management Throughput Receiving antennas Transmitting antennas OFDM modulation State feedback Fading

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Adaptive modulation and coding techniques in MUOS fading/scintillation environments

Adaptive modulation and coding techniques in MUOS fading/sci...

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MILCOM, Military Communications Conference

作者： E.H. Satorius Zhong Ye Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA

In this paper, adaptive modulation and coding structures are presented that are appropriate for the MUOS environment. The proposed approach adaptively controls the modulation format, FEC coding rate, transmission power and even possibly bandwidth spreading gain in response to changing channel conditions in an attempt to optimize throughput while maintaining acceptable error rate performance. Being able to estimate and then predict the channel is vital to the system performance. Channel prediction algorithms; have been developed and the advantages of the adaptive modulation/coding techniques are presented together with implementation issues.

关键词： modulation coding Fading Rayleigh channels Frequency Diversity reception Forward error correction Feedback Channel estimation Propulsion Bandwidth

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Adaptive modulation and coding for communication over the atmospheric turbulence channels

Adaptive modulation and coding for communication over the at...

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LEOS Summer Topical Meetings

作者： Ivan B. Djordjevic Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

We propose an adaptive coding scheme that provides robust and spectrally-efficient transmission over strong atmospheric turbulence channels. We demonstrate that deep fades in the order of 35 dB and above can be tolera... 详细信息

关键词： modulation coding Optical transmitters Optical feedback Optical receivers Radio frequency Pulse modulation Parity check codes Laser feedback Optical fiber networks Optical modulation

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