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- W814581931 abstract "This thesis forms part of a joint universities project in which it isrequired to design and build a digital modem for the transmission ofspeech or data over a 900MHz land mobile radio channel. The mainobjectives being to try to maximize the bandwidth efficiency and attainnear-optimum system performance.The theoretical modem design is presented here. The other parts ofthe system, that is the error control coding, speech coding, RF design qndthe actual hardware implementation are described elsewhere. All thesystems described here have been designed to satisfy the overall systemrequirements. In particular, it must be possible to build this modem withexisting technology without undue equipment complexity. All aspects of the digital'modem design are addressed, namely thechoices of modulation scheme, pulse shaping filtering, packet structureand timing and synchronization methods suitable for the transmission of adigital signal over the fading radio channel. The important problems ofchannel estimation and data detection are examined in more detail.The first system described is one in which only one digital signal istransmitted in a narrowband channel. In the second system a noveltechnique of transmitting two signals in the same frequency band from twodifferent mobiles to a single base station is described, which makes useof the fact that these two transmission paths are fading independently.The third system describes a method for transmitting back to these mobilesfrom the base station, again in the same frequency band. Although these systems have been designed specifically for use over900MHz cellular land mobile radio channels, the ,techniques described aredirectly applicable to digital signal transmission over any flat fadingchannel." @default.
- W814581931 created "2016-06-24" @default.
- W814581931 creator A5070939231 @default.
- W814581931 date "1988-01-01" @default.
- W814581931 modified "2023-09-28" @default.
- W814581931 title "Coherent detection of QAM signals in land mobile radio" @default.
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- W814581931 hasPublicationYear "1988" @default.
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