Patent
Multiple frequency communication device
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TLDR
The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive as discussed by the authors, where the transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers.Abstract:
The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145) The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneouslyread more
Citations
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Patent
Code division multiple access (CDMA) communication system
TL;DR: In this article, a closed loop power control system for maintaining a minimum system transmit power level for a radio carrier station and the subscriber units, and system capacity management for maintaining the maximum number of active subscriber units for improved system performance.
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Transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands
TL;DR: In this article, a transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands is proposed, which is based on direct conversion and the mixing frequency is formed by means of the same synthesizer.
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Shared functional block multi-mode multi-band communication transceivers
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Kari Lehtinen,Mikko Pesola +1 more
TL;DR: In this article, an arrangement for transmitting a radio-frequency signal at two different frequency bands and for receiving at two distinct frequency bands is proposed, where one and the same filter (72, 75) belonging to the RF front end of the antenna circuit is used for filtering interference from at least two signals located at different frequencies, in which case the number of filters can be reduced.
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Automatic power control system for a code division multiple access (cdma) communications system
TL;DR: In this paper, a receiver receives signals and noise over a frequency spectrum of a desired received signal using code division multiple access (CDMA) and demodulates them to produce a demodulated signal.
References
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Patent
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