Multiuser detection techniques provide attractive performance characteristics for CDMA systems. A recently proposed blind adaptive multiuser detector provides near-far resistance without requiring any more information than a conventional detector. In this paper, an optimum and two suboptimum multi-element blind adaptive receivers are proposed. These receivers exploit the spatial distribution of...

This publication presentsa novel multireceiver configuration for the purpose of carrier arraying and/or signal arraying. Such a problem arises for example, in the NASA Deep SpaceNetwork where the samedata-modulated signal from a spacecraft is receivedby a number of geographically separatedantennasand the data detection must be ef/iciently performed on the basisof the various receivedsignals. Th...

Cooperative reception allows diversity to be achieved by a group of radios that are not physically connected but that receive independent copies of a message. The receivers achieve diversity by exchanging messages. One such technique is collaborative decoding, in which the receivers iterate between decoding and information exchange. Collaborative decoding has been shown to be effective for conv...

All TV-video systems receive and/or process the audio portion of the TV signal. The audio circuits may receive only the monaural portion or may decode the MTS stereo and SAP audio signals as well. The Electronics Industry Association (EIA) reports that sales of MTS Stereo TV receivers have enjoyed six straight years of double digit increases. MTS Stereo decoder circuits are now virtually standa...

As scaling reduces the breakdown voltage of CMOS devices and as system integration trends demand the further elimination of offchip components, there arises a great need to improve the linearity of RF receivers. Of particular interest is the direct-conversion architecture, which is currently the workhorse of the mobile telecommunications industry. Although much work has been recently reported i...

Basics of the theory of direct chaotic communications is presented. We introduce the notion of chaotic radio pulse and consider signal structures and modulation methods applicable in direct chaotic schemes. Signal processing in noncoherent and coherent receivers is discussed. The efficiency of direct chaotic communications is investigated by means of numerical simulation. Potential application ...

Recently there has been considerable research on develop ing receivers for multi rate synchronous DS CDMA systems The previously proposed receivers operate on the complete received signal without separating users of di erent rates Multi rate users occupy di erent bandwidths and this pa per explores user separation by exploiting these bandwidth di erences Receiver structures which use lters to a...

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A 900MHz balanced harmonic mixer for direct conversion receivers is fabricated in a 0.35 μm standard digital CMOS process. The self-mixing-induced DC offset is about 44dB lower than that of the conventional mixer. The inputreferred offset is reduced to the noise level. Specific techniques on flicker noise reduction are also discussed. At 3V power supply and -15.4dBm LO power, it achieves 13 dB ...