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- W638857036 abstract "This thesis deals with performance limits and transmissiontechniques for a wireless communication link where at least thetransmitter is equipped with an antenna array and moreover hasaccess to possibly imperfect channel state information.An antenna array on the transmit side provides the systemwith an extra spatial dimension that can be utilized for codingboth in the spatial as well as the temporal domain. The recentdevelopment of such space-time codes shows that there are waysof exploiting multiple transmit antennas while completelyavoiding traditional beamforming techniques' need of accuratechannel state information. In practice however, the transmitterusually has access to some information about the current stateof the channel. The available channel side information can thenbe used to improve the performance beyond what is possibleusing only conventional space-time codes. This, together withthe need for reliable and fast communication, providesmotivation for the work herein which shows how previousspace-time coding concepts can be extended to take advantage ofeven non-perfect channel knowledge at the transmitter.Performance limits are investigated using tools frominformation theory. An expression for the channel capacity forthe wireless link under consideration is presented. Oneimportant result is that adjusting the output of a conventionalspace-time encoder by means of a transmit weighting matrix thatonly depends on the channel side information constitutes acapacity achieving transmitter structure. Computationalprocedures for evaluating the capacity expression areconsidered and used to obtain numerical results illustratingthe gains due to channel knowledge.The other parts of the thesis are devoted to devisingpractical methods for exploiting channel knowledge inconjunction with space-time coding. A new performance criterionis developed that takes the quality of the channel sideinformation into account. Motivated by the optimality ofseparate space-time coding and transmit weighting, theperformance criterion is used for determining a suitabletransmit weighting matrix that adapts a predeterminedorthogonal space-time block code (OSTBC) to the availablechannel side information. The result is a low-complexityweighted OSTBC transmission scheme providing a seamlesscombination of the normally complementary strengths offered byconventional beamforming and OSTBC.Scenarios in which the channel side information takes theform of quantized channel estimates obtained from a feedbacklink are also considered. The channel feedback is assumed tosuffer from quantization errors, feedback delay and bit-errorsintroduced by a noisy feedback channel. Methods to design thequantizer in the feedback link so as to mitigate all theseerrors are investigated. By introducing heuristic modificationsof our previously developed transmission technique, it is shownhow robustness against all three types of channel feedbackimpairments may be achieved.To avoid the use of heuristics in case of quantized channelside information, yet another new performance criterion isdeveloped specifically for the problem at hand. Based on theperformance criterion, a procedure for utilizing the availableside information in the design of unstructured space-time blockcodes is proposed. These codes offer maximal design freedom atthe expense of an increased decoding complexity. Properties ofthe resulting codes are investigated both analytically andexperimentally. The codes outperform corresponding OSTBCschemes even when no channel knowledge is available at thetransmitter.In addition to unstructured codes, closely relatedtechniques based on the same performance criterion are used fordesigning some linear dispersive space-time block codes as wellas designing suitable transmit weighting matrices for weightedOSTBC. An interesting observation that deserves further studyis that the design procedure for linear dispersive codes incase of no channel knowledge at the transmitter appears toautomatically produce orthogonal space-time block codes, if theparameters under consideration allow it." @default.
- W638857036 created "2016-06-24" @default.
- W638857036 creator A5034921260 @default.
- W638857036 date "2003-01-01" @default.
- W638857036 modified "2023-09-23" @default.
- W638857036 title "Utilizing Channel State Information in Space-Time Coding : Performance Limits and Transmission Techniques" @default.
- W638857036 cites W137407478 @default.
- W638857036 cites W1487607578 @default.
- W638857036 cites W1492902619 @default.
- W638857036 cites W1508552130 @default.
- W638857036 cites W1528854959 @default.
- W638857036 cites W1530239534 @default.
- W638857036 cites W1554781006 @default.
- W638857036 cites W1559749676 @default.
- W638857036 cites W1577906631 @default.
- W638857036 cites W1589546425 @default.
- W638857036 cites W1596939795 @default.
- W638857036 cites W1598418414 @default.
- W638857036 cites W1632601927 @default.
- W638857036 cites W1634005169 @default.
- W638857036 cites W1667950888 @default.
- W638857036 cites W1672566513 @default.
- W638857036 cites W1740590210 @default.
- W638857036 cites W1839416498 @default.
- W638857036 cites W1891981267 @default.
- W638857036 cites W1892155297 @default.
- W638857036 cites W1892419725 @default.
- W638857036 cites W1926352580 @default.
- W638857036 cites W1928419522 @default.
- W638857036 cites W1957119712 @default.
- W638857036 cites W1965392255 @default.
- W638857036 cites W1974484913 @default.
- W638857036 cites W1995875735 @default.
- W638857036 cites W2011396057 @default.
- W638857036 cites W2012782228 @default.
- W638857036 cites W2017418946 @default.
- W638857036 cites W2021203670 @default.
- W638857036 cites W2026079182 @default.
- W638857036 cites W2044612261 @default.
- W638857036 cites W2051070456 @default.
- W638857036 cites W2068028939 @default.
- W638857036 cites W2071238091 @default.
- W638857036 cites W2074119885 @default.
- W638857036 cites W2081285999 @default.
- W638857036 cites W2085099144 @default.
- W638857036 cites W2096927504 @default.
- W638857036 cites W2099111195 @default.
- W638857036 cites W2102083017 @default.
- W638857036 cites W2103604544 @default.
- W638857036 cites W2106791060 @default.
- W638857036 cites W2107080958 @default.
- W638857036 cites W2107324776 @default.
- W638857036 cites W2107689535 @default.
- W638857036 cites W2107753712 @default.
- W638857036 cites W2107757493 @default.
- W638857036 cites W2108316256 @default.
- W638857036 cites W2108656668 @default.
- W638857036 cites W2110326468 @default.
- W638857036 cites W2110659753 @default.
- W638857036 cites W2115543075 @default.
- W638857036 cites W2117033416 @default.
- W638857036 cites W2117359246 @default.
- W638857036 cites W2117507580 @default.
- W638857036 cites W2118040894 @default.
- W638857036 cites W2119456443 @default.
- W638857036 cites W2119997240 @default.
- W638857036 cites W2120302973 @default.
- W638857036 cites W2121233130 @default.
- W638857036 cites W2121657437 @default.
- W638857036 cites W2121782860 @default.
- W638857036 cites W2122134780 @default.
- W638857036 cites W2122525483 @default.
- W638857036 cites W2124250240 @default.
- W638857036 cites W2124841041 @default.
- W638857036 cites W2124951289 @default.
- W638857036 cites W2125865271 @default.
- W638857036 cites W2128261358 @default.
- W638857036 cites W2128652224 @default.
- W638857036 cites W2128866026 @default.
- W638857036 cites W2130319142 @default.
- W638857036 cites W2131909533 @default.
- W638857036 cites W2132818688 @default.
- W638857036 cites W2133475491 @default.
- W638857036 cites W2134110434 @default.
- W638857036 cites W2135304395 @default.
- W638857036 cites W2135665698 @default.
- W638857036 cites W2139399084 @default.
- W638857036 cites W2139593345 @default.
- W638857036 cites W2140954924 @default.
- W638857036 cites W2141179114 @default.
- W638857036 cites W2142228115 @default.
- W638857036 cites W2142361128 @default.
- W638857036 cites W2142901448 @default.
- W638857036 cites W2143447102 @default.
- W638857036 cites W2146514797 @default.
- W638857036 cites W2146553711 @default.
- W638857036 cites W2147329751 @default.
- W638857036 cites W2148089951 @default.
- W638857036 cites W2148223228 @default.
- W638857036 cites W2148931807 @default.