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检索条件"主题词=Modulation coding"

共 7024 条记录，以下是131-140 订阅

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Multiple modulation and coding Scheme to Enhance the Downlink Data Throughput

Multiple Modulation and Coding Scheme to Enhance the Downlin...

引用

International Conference on Microelectronics, ICM

作者： F. Abbas Air University Islamabad Pakistan

This paper reviews concepts and techniques related to the effect of modulation accuracy on HSDPA radio link performance. The Error Vector Magnitude (EVM) results are simulated and discussed by using the test models without HSDPA (test model 1) and with HSDPA (test model 5) defined in 3 rd generation partnership project (3gpp) [1] for RF part by introducing some non-linearity in the test signal passing through RF transmitter (RFTX) chain. In this work from the figures 5 (PSat = 10.1 dBm), 6 (PSat = 13.2 dBm) and the discussions based on 3gpp specs (EVM = 17.5 % without HSDPA and 12.5 % with HSDPA) it can be concluded that the RF TX path got to be (PSat =3.1 dBm) more linear to support the HSDPA.

关键词： modulation coding Downlink Throughput Multiaccess communication Testing Radio frequency Radio link Signal generators RF signals Radio transmitters

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Adaptive modulation and coding for Hybrid Cooperative Networks

Adaptive Modulation and Coding for Hybrid Cooperative Networ...

引用

IEEE International Conference on Communications (ICC)

作者： E. C. Strinati S. Yang J. C. Belfiore CEA/LETI Labs Grenoble France ENST Paris France

This paper deals with throughput oriented adaptive modulation and coding (AMC) techniques combined with cooperative protocols where terminals are constrained by half-duplex assumption and average total network power. We propose a novel hybrid cooperation protocol that switches from cooperative to non-cooperative transmission based on the momentary direct source-destination link quality. Then, we propose an hybrid cooperative AMC mechanism, which combines AMC with hybrid cooperation. Simulation results show that our proposal improves the average system performance and reduces the average cooperation signaling cost.

关键词： modulation coding Throughput Quality of service Relays Decoding Media Access Protocol Automatic repeat request Communications Society Switches Proposals

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modulation and coding schemes for TDM/SS packet radio

Modulation and coding schemes for TDM/SS packet radio

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： K.W. Yates S.U. Zaman School of Electrical Engineering University of Technology Broadway NSW Australia

A novel frequency hopped spread spectrum packet radio communication system suitable for time division multiplexed, high speed indoor office wireless networks is proposed. The hopping is carried out at a logical level on the bit stream rather than physical hopping of the carriers. This on one hand eliminates phase problems associated with differential modulation along hopped carriers in frequency-selective fading channels, and on the other circumvents the need for agile frequency synthesizers. A coding strategy has been developed to provide the best error-rate performance under given channel conditions. System design issues are discussed and an example design is presented.< >

关键词： modulation coding Time division multiplexing Packet radio networks Spread spectrum communication Phase modulation Fading Frequency synthesizers Frequency diversity Wireless LAN Bandwidth

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Performance enhancement of joint adaptive modulation, coding and power control using cochannel-interferer assistance and channel reallocation

Performance enhancement of joint adaptive modulation, coding...

引用

IEEE Conference on Wireless Communications and Networking

作者： M.H. Ahmed H. Yanikomeroglu D. Falconer S. Mahmoud BCWS Centre Dept. of Systems and Computer Eng. Carleton University Ottawa Canada

This paper proposes a joint adaptive rate selection and power control algorithm for broadband TDMA/TDM wireless networks. The proposed algorithm is a modified, enhanced, and more robust version of the selective power control with active link protection (SPC-ALP) algorithm proposed for adaptive transmission rate and power control in CDMA networks [*** and S. Kim, 2000]. Unlike SPC-ALP, the proposed algorithm uses adaptive coding and modulation (instead of variable spreading gain) for transmission rate control. In addition, the proposed algorithm is different in two aspects; the first one is the inclusion of the cochannel interferer assistance mode, while the second one is the use of the signal quality as a criterion for user removal. Results show that the proposed algorithm outperforms SPC-ALP in terms of the net throughput and signal quality measures such as the outage probability and frame error rate. Channel reallocation is also studied and found to be very effective in enhancing the system performance particularly at low to medium loading.

关键词： Programmable control Adaptive control modulation coding Power control Time division multiple access Time division multiplexing Wireless networks Robust control Protection Multiaccess communication

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Adaptive modulation and coding for generalized fading channels

Adaptive modulation and coding for generalized fading channe...

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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： Ivan B. Djordjevic Goran T. Djordjevic Department of Electrical and Computer Engineering IUniversity of Arizona Tucson AZ Telecommunications Department University of Nis Serbia Montenegro

The adaptive modulation and coding can provide robust and spectrally efficient transmission over generalized ¿-¿ (or generalized gamma) wireless fading channels. The key idea of our proposal is to transmit the low-density parity-check (LDPC) encoded sequence over the generalized fading channel, feedback the channel state information of by an RF feedback channel, and adapt the powers and rates of so that the channel capacity is maximized. The optimal power adaptation policy maximizing the channel capacity is derived. We show that deep fades can be tolerated with proposed scheme.

关键词： modulation coding Fading Parity check codes Radio frequency Channel capacity Power system modeling Transmitters Wireless communication Receiving antennas Transmitting antennas

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Hybrid ARQ and adaptive modulation and coding schemes for high speed downlink packet access

Hybrid ARQ and adaptive modulation and coding schemes for hi...

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

作者： M. Dottling J. Michel B. Raaf Siemens Mobile Phones Munich Germany

A major evolution of the UMTS standard is the so-called high speed downlink packet access (HSDPA) mode, which provides peak data rates of 10.8 Mbps. Key enabling technologies include fast scheduling, adaptive modulation and coding (AMC), as well as hybrid automatic repeat request (HARQ). The paper gives a general overview of the current HSDPA standard. Special focus is put on the implementation and performance of the AMC and HARQ functions, as well as on their interworking. The performance of different HARQ schemes are compared for QPSK and 16-QAM and varying code rates. Subsequently, link-level throughput is simulated. It is shown that the throughput gains offered by advanced HARQ schemes depend on the performance of the AMC function. In particular, the gain offered by incremental redundancy techniques increases with increasing errors in selecting the appropriate modulation and code rate.

关键词： Automatic repeat request modulation coding Downlink Multiaccess communication Throughput 3G mobile communication Adaptive scheduling Quadrature phase shift keying Performance gain Redundancy

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Handover Performance Analysis in Mobile Systems with Adaptive modulation and coding

Handover Performance Analysis in Mobile Systems with Adaptiv...

引用

International Conference on Digital Telecommunications (ICDT)

作者： Adriana Kalaydzhieva Boris Tsankov Department of Telecommunications Technical University of Sofia Sofia Bulgaria

In this paper, we evaluate the voice traffic performance of an OFDM (Orthogonal Frequency Division Multiplexing) wireless access system. We propose an algorithm for serving handover calls with higher priority than new calls, considering different AMC (adaptive modulation and coding) modes. The purpose is to efficiently utilize the scarce radio resources in order to improve the system performance.

关键词： Performance analysis Adaptive systems modulation coding Quality of service Wireless networks OFDM modulation Bandwidth System performance Degradation Urban areas

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Optimized link adaptation for wireless packet communications based on discrete-rate modulation and coding schemes

Optimized link adaptation for wireless packet communications...

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IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Jalil Seifali Harsini Farshad Lahouti Wireless Multimedia Communications Laboratory School of Electrical and Computer Engineering University of Tehran Iran

Adaptive modulation and coding (AMC) is a powerful technique for improving the spectral efficiency or the error performance in wireless packet networks over fading channels. In this article, using a fixed number of modulation and coding modes we propose a variable power transmission scheme for transmission of packets over block-fading wireless channels. We obtain the general form of optimal power adaptation and optimum AMC mode switching levels that maximize spectral efficiency under prescribed packet error rate (PER) constraint while satisfying an average transmit power constraint. Numerical results reveal that in wireless packet systems with limited packet length, the proposed scheme provides substantial average spectral efficiency gain when compared to the non-adaptive case. The optimization framework presented in this article would be useful for cross-layer optimization of physical layer in packet networks.

关键词： Wireless communication modulation coding Physical layer Bit error rate Fading Error analysis Quality of service Throughput Delay systems Multimedia communication

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Uplink synchronous WCDMA combined with variable modulation and coding

Uplink synchronous WCDMA combined with variable modulation a...

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IEEE Conference on Vehicular Technology (VTC)

作者： J. Outes K. Pedersen P. Mogensen T. Kolding Center for PersonKommunikation University of Aalborg Aalborg Denmark Nokia Networks Aalborg Denmark

Previous studies show a high potential capacity gain for uplink synchronous WCDMA systems in low dispersive environments when users in the same cell are separated by orthogonal codes. However, the number of available orthogonal codes tends to limit the capacity gain of this scheme. In this paper, variable modulation and coding is introduced as a solution to improve the channelization code utilization per user equipment and thereby increase the capacity of uplink synchronous WCDMA. The radio resource management algorithms to support this scheme are presented. Theoretical and simulation results on the capacity gain of uplink synchronous WCDMA combined with variable modulation and coding are presented. A 29% capacity gain is obtained for a pedestrian micro-cell environment.

关键词： Multiaccess communication modulation coding Resource management Signal to noise ratio Multiple access interference Radio transmitters Dispersion Interference constraints Working environment noise Peak to average power ratio

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Adaptation of modulation and coding for fading channels based on a block demodulation algorithm

Adaptation of modulation and coding for fading channels base...

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MILCOM, Military Communications Conference

作者： D.M. Zook C.W. Baum Clemson University USA

Mobile communication systems can benefit greatly from the use of adaptive signaling. Adaptive signaling can provide a higher data rate than fixed-rate signaling techniques while maintaining an acceptable bit error rate (BER). This paper explores the use of a block demodulation algorithm for providing the basis for adaptation in fading channels. The modulation parameters are adjusted based the receiver's implicit estimate of the reliability of the current block. An adaptation algorithm has been analyzed in which the receiver estimates the current fading rate, adjusts decision thresholds correspondingly and compares them to reliability information generated by the receiver. The adaptive algorithm has shown greatly improved performance compared to fixed-rate schemes over a wide range of channel parameters.

关键词： modulation coding Fading Demodulation Bit error rate Protocols Receivers Decoding Statistics Change detection algorithms Convolutional codes

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