algorithmics and modular computations, Theory of Codes and Cryptography (3).From an analytical 1. RE Blahut. Theory and practice of error control codes. eecs.uottawa.ca/∼yongacog/courses/coding/ (3) R.E. Blahut,Theory and Practice of Error Control Codes, Addison Wesley, 1983. QA 268. Cached. Download as a PDF 457, Theory and Practice of Error Control CodesBlahut 1984 (Show Context). Citation Context..ontinued fractions.

Theory and practice of error control codes

This paper describes the Multi-Radio Diversity (MRD) wireless system, which uses path diversity to improve loss resilience in wireless local area networks WLANs). MRD coordinates wireless receptions among multiple radios to improve loss resilience in the face of path-dependent frame corruption over the radio. MRD incorporates two techniques to recover from bit errors and lower the loss rates observed by higher layers, without consuming much extra bandwidth. The first technique is frame combining in which multiple, possibly erroneous, copies of a given frame are combined together in an attempt to recover the frame without retransmission. The second technique is a low-overhead retransmission scheme called request-for-acknowledgment (RFA), which operates above the link layer and below the network layer to attempt to recover from frame combining failures. We present an analysis that determines how the parameters for these algorithms should be chosen.We have designed and implemented MRD as a fully functional WLAN infrastructure based on 802.11a. In our testbed, we measured throughput gains up to 2.3 - over single radio communication schemes employing 802.11's autorate adaptation scheme.

/pdf/improving-loss-resilience-with-multi-radio-diversity-in-3si899uy7m.pdf

Improving loss resilience with multi-radio diversity in wireless networks

In a radio access network, multicast packets are delivered each identified by a multicast network layer address representing a multicast group of access terminals. The multicast packets are delivered in one or more air link frames using a common control channel that is shared among access terminals in a sector. Each airlink frame carries a multicast air link address that identifies the multicast group of terminals.

Broadcasting and multicasting in wireless communication

There is described a method of controlling a basestation in a cellular wireless communications network, the method comprising, within the basestation, autonomously and dynamically adapting a maximum value for a total transmit power of the basestation, such that interference between the basestation and other access points in the vicinity is minimized.

Access point power control

A method for selecting a transport format to transmit messages in a wireless communication system. The method includes the steps of obtaining (620) transmission information from a wireless subscriber unit, and modifying a communication channel format (660) in response to said transmission information. Preferably, the transmission information is retransmission requests from a wireless subscriber unit, which are transmitted frequently.

Method and arrangement for power control

A mobile communications system having a multi-level distributed frame selection and power control architecture includes a plurality of base station transceiver subsystems (BTSs) arranged in cells. Each base station transceiver subsystem (BTS) includes a capability for establishing a radio frequency interface with a subscriber unit in conjunction with a telephone call. A PSEL provides for implementing a power control and frame selection of compressed packet data in conjunction with the telephone call, the PSEL coupled to and being positioned proximate the plurality of base station transceiver subsystems. A router is coupled to the PSEL for routing compressed packet data to and from the PSEL. Lastly, a CSEL provides for implementing call processing and call management in conjunction with the telephone call, the CSEL coupled between the router and a prescribed mobile switching center (MSC) and further being positioned proximate the MSC, wherein the router is further for routing compressed packet data to and from the CSEL.

Multilevel distributed frame selection and power control cdma architecture method and apparatus for telecommunication networks

The performance of ARQ systems can be improved by combining current and prior transmissions at the receiver. Two techniques for combining outputs in a packet-based communication system are presented. In both techniques the fundamental unit of retransmission is a packet, and the fundamental unit of combining is a codeword. The techniques are analyzed for a bursty channel and a system that employs Reed--Solomon coding and bounded-distance errors-and-erasures decoding. Performance results show that the packet-combining schemes provide significant gains in throughput and reductions in error probability when compared with a system that does not employ combining.

Methods for packet combining in HARQ systems over bursty channels

The optimal power allocation process of the present invention allocates power between two base stations, serving a given mobile radiotelephone, during soft hand-off. A minimum total transmit power is chosen initially. The minimum total transmit power level, the path losses for each base station, the maximum transmit power for each base station, and the minimum allowed received power are all used to generate a range of values for a transmit power level multiplier, α. The multiplier is used to allocate the total transmit power among the base stations. This process is performed until the probability of bit error is less than a maximum threshold.

Forward link power control in a cellular radiotelephone system

Abshact — The Performance of Wireless mdt“media Networks depends on having a rbust error control scheme and eficient/refiable network transport. This paper presents a new analytic framework for determining g the performance of asynchronous spread spectrum mtitipleaccess networks that uses a hybrid ARQ protocol. The enhanced protocol (de scribed in this paper) can be further used in this mdtiple access network (-d other networks) to provide higher capacity for the network and less time for users to use the commtication M. The two techniques provide the capabilities of investigating different wir+ less mdti-media and mtitipleaccess networks with variety of retransmission protocob, prot~ COIenhancements, and channel conditions.

Protocol enhancements in wireless multimedia and multiple-access networks

The erasure of unreliable symbols can significantly improve the performance of frequency-hop communication systems. In this paper, Bayesian decision theory and parameter estimation techniques are used to decide which symbols to erase. Erasure decisions are made by combining the envelope detector outputs into statistics that estimate signal-to-noise ratios and symbol reliabilities. With these techniques, no a priori channel information is needed and no test symbols are required. The performance of these techniques in frequencyhop systems with Reed-Solomon coding is determined for channels with partial band interference, fading and wideband noise. This system provides performance comparable to the theoretical performance that would be obtained if perfect a priori channel information were present. In addition, performance is much superior to that obtained by errors-only decoding.

https://ieeexplore.ieee.org/iel2/3486/10315/00483379.pdf

Abdel-Ghani Daraiseh

Papers

Multilevel distributed frame selection and power control cdma architecture method and apparatus for telecommunication networks

Methods for packet combining in HARQ systems over bursty channels

Forward link power control in a cellular radiotelephone system

Protocol enhancements in wireless multimedia and multiple-access networks

Adaptive erasure generation for coded interference and fading frequency-hop communications with partial-band