Author: James Holland McKinney (Jr.)Publisher:
ISBN:
Category :
Languages : en
Pages : 130
Book Description
Adaptive Coding to Increase the Throughput in a Packet-switched, Frequency-hop Spread-spectrum Communications Network
Author: James Holland McKinney (Jr.)Publisher:
ISBN:
Category :
Languages : en
Pages : 130
Book Description
Adaptive Coding for Mobile Wireless Frequency-hop Spread Spectrum Networks
Author: Jason S. SkinnerThe Summary of Engineering Research
Author: University of Illinois at Urbana-Champaign. Office of Engineering PublicationsPublisher:
ISBN:
Category : Engineering
Languages : en
Pages : 380
Book Description
Coding for Spread-Spectrum Communications Networks
Author: Bal G. KimPublisher:
ISBN:
Category :
Languages : en
Pages : 159
Book Description
The multiple-access capability of a frequency-hop packet radio network is investigated from a coding point of view. The achievable region of code rate and channel traffic and the normalized throughput are considered as performance measures. We model the communication system from the modulator input to the demodulator output as an I-user interference channel, and evaluate the asymptotic performance fo various coding schemes for channels with perfect side information, no side information, and imperfect side information. The coding schemes being considered are Reed-Solomon codes, concatenated codes, and parallel decoding schemes. We derive the optimal code rate and the optimal channel traffic at which the normalized throughput is maximized, and from these optimum values the asymptotic maximum normalized throughput is derived. The results are then compared with channel capacities.
Research in Progress
Author: Turbo-like Coding for Spread-spectrum Communications
Author: Hasung KimPublisher:
ISBN:
Category : Coding theory
Languages : en
Pages :
Book Description
This thesis studies advanced error control schemes using turbo-like codes, turbo-like coded modulations, turbo hybrid-ARQ (Automatic Repeat reQuest) schemes, and rate compatible puncturing techniques for reliable and adaptive commercial and tactical spread-spectrum communications, especially for code-division multiple access (CDMA) cellular systems and direct-sequence (DS) and frequency-hopping (FH) anti-jam systems. Furthermore, we utilize both the maximum-likelihood (ML) bounding techniques and convergence analysis to design and analyze various turbo-like coding schemes that show different behaviors in error performance from conventional trellis coding schemes. In the area of DS-CPM, we propose a DS concatenated coded CPM system for pulse-noise jamming channels and an anti-jam iterative receiver utilizing jammer state information. We also design a mixed concatenated CPM system that mixes CPM schemes with different convergence characteristics. In addition, we present the ML bound and convergence analysis for the jamming channel. In the area of FH-CPM, we propose anti-jam serially concatenated slow FH-CPM systems, whose phase is continuous during each hop interval, along with coherent and non-coherent iterative receivers. We also propose an iterative jamming estimation technique for the iterative receiver. In the area of multi-h CPM, we propose a power- and bandwidth-efficient serially concatenated multi-h CPM along with an appropriate iterative receiver structure. Serially concatenated multi-h CPM is shown to outperform single-h CPM. To design adaptive and versatile error control schemes using turbo-like codes for packet-data networks, we propose turbo hybrid-ARQ (HARQ) and rate compatible puncturing techniques for retransmission. In the area of turbo hybrid-ARQ, we propose a Type-I turbo HARQ scheme using a concatenated RS-turbo code and a packet combining technique for W-CDMA system to improve the performance of error and decoding latency. The W-CDMA system including the fast power control and coherent Rake receiver with a channel estimation technique for multipath fading channels is considered. Finally, in the area of rate compatible punctured turbo-like codes, we propose rate compatible punctured turbo (RCPT) codes and rate compatible punctured serially concatenated convolutional (RCPS) codes along with their puncturing methods. In addition, we propose Type-II RCPT-HARQ and RCPS-HARQ schemes to perform an efficient incremental redundancy retransmission.
Proceedings of the ... Conference on Information Sciences and Systems
Author: Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 932
Book Description
Scientific and Technical Aerospace Reports
Author: Communications on the Move
Author: Publisher: IEEE Computer Society Press
ISBN:
Category : Combat survivability (Military engineering)
Languages : en
Pages : 446
Book Description
Coding for Spread Spectrum Packet Radios
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781725553057
Category :
Languages : en
Pages : 36
Book Description
Packet radios are often expected to operate in a radio communication network environment where there tends to be man made interference signals. To combat such interference, spread spectrum waveforms are being considered for some applications. The use of convolutional coding with Viterbi decoding to further improve the performance of spread spectrum packet radios is examined. At 0.00001 bit error rates, improvements in performance of 4 db to 5 db can easily be achieved with such coding without any change in data rate nor spread spectrum bandwidth. This coding gain is more dramatic in an interference environment. Omura, J. K. Jet Propulsion Laboratory NASA-CR-163628, JPL-PUB-80-75 NAS7-100...