I-Q TCM: Reliable Communication Over the Rayleigh Fading Channel Close to the Cutoff Rate

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dc.contributor.authorAl-Semari, Saud A.en_US
dc.contributor.authorFuja, Tom E.en_US
dc.contributor.departmentISRen_US
dc.date.accessioned2007-05-23T10:01:46Z
dc.date.available2007-05-23T10:01:46Z
dc.date.issued1996en_US
dc.description.abstractThis paper presents some trellis codes that provide high coding gain over the frequency non-selective slowly Raleigh distributed fading channel. It is shown that the use of two encoders in parallel - used to specify the in-phase and quadrature components of the transmitted signal - results in greater minimum time diversity than the conventional design in which a single encoder is used. Using this approach - which we label ﲉ-Q TCM - codes with bandwidth efficiencies of 1,2, and 3 bits/sec/Hz are described for various constraint lengths. The performance of these codes is bounded analytically and approximated via simulation; the results show a large improvement in the BER when compared with conventional TCM schemes when perfect channel state information (CSI) is available to the receiver. Indeed, when this approach is applied to channels with independent Rayleigh fading, the resulting coding gain is close to that implied by the cutoff rate limit, even for only moderately complex systems.<P>The proposed codes are also simulated under less ideal assumptions. For instance, results for a 1 bit/sec/Hz IQ-TCM code without CSI show a significant gain over conventional coding. Finally, simulations over channels with correlated fading were undertaken; it is concluded that an interleaver span of 4v yields performance close to what is achieved with ideal interleaving.en_US
dc.format.extent1140722 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/5764
dc.language.isoen_USen_US
dc.relation.ispartofseriesISR; TR 1996-45en_US
dc.subjectdigital communicationsen_US
dc.subjecterror-detection codesen_US
dc.subjectinformation theoryen_US
dc.subjectrobust information processingen_US
dc.subjectsignal processingen_US
dc.subjectwireless communicationen_US
dc.subjectfading channelsen_US
dc.subjectIntelligent Signal Processing en_US
dc.subjectCommunications Systemsen_US
dc.titleI-Q TCM: Reliable Communication Over the Rayleigh Fading Channel Close to the Cutoff Rateen_US
dc.typeTechnical Reporten_US

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