Devices and methods for diversity signal enhancement and cosite cancellation

Abstract

Devices and methods for providing enhanced diversity reception and cosite cancellation are disclosed. According to one aspect, the subject matter described herein includes a device for providing enhanced diversity reception and cosite cancellation. The device includes a transmit chain connected to a circulator further connected to first antenna and to a combiner. The combiner is connected to anti-cosite circuitry and to first detector. The anti-cosite circuitry is further connected to a secondary antenna. The first detector is further connected to a receive chain.

What is claimed is: 
     
         1 . A device for providing enhanced diversity reception and/or cosite cancellation, the device comprising:
 a first antenna for transmitting and receiving signals;   a circulator for connecting a transmit chain to the first antenna and for connecting the first antenna to a first input of a combiner;   a second antenna for receiving signals;   adjusting circuitry for connecting the second antenna to a second input of the combiner; and   a first detector for detecting an output of the combiner and providing the detected signal to a receive chain.   
     
     
         2 . The device of  claim 1  wherein the adjusting circuitry operates to reduce cosite interference. 
     
     
         3 . The device of  claim 1  comprising a phase shifter. 
     
     
         4 . The device of  claim 3  comprising at least one selectable fixed phase delay elements. 
     
     
         5 . The device of  claim 4  comprising a selector for selecting one of the at least one fixed phase delay elements. 
     
     
         6 . The device of  claim 1  wherein the adjusting circuitry comprises an amplifier. 
     
     
         7 . The device of  claim 1  comprising an attenuator. 
     
     
         8 . The device of  claim 1  wherein the adjusting circuitry comprises a phase shifter connected to a signal amplifier. 
     
     
         9 . The device of  claim 1  comprising a controller connected to at least one of: a detector; a phase shifter; an amplifier; and an attenuator. 
     
     
         10 . The device of  claim 9  comprising at least one of: a second detector between the first antenna and the first input of the combiner; and a third detector between the adjusting circuitry and the second input of the combiner. 
     
     
         11 . The device of  claim 9  wherein the adjusting circuitry is controllable. 
     
     
         12 . The device of  claim 1 , wherein the device comprises a mobile communication device. 
     
     
         13 . The device of  claim 12 , wherein the mobile communication device comprises a cellular telephone. 
     
     
         14 . A method for providing enhanced diversity reception and/or cosite cancellation, the method comprising:
 transmitting or receiving signals using a first antenna;   receiving a first signal from the first antenna;   detecting a diversity signal with a second antenna;   adjusting the diversity signal to provide an adjusted diversity signal; and   combining the adjusted diversity signal and the first signal to provide enhanced receiving of the first signal.   
     
     
         15 . The method of  claim 14  wherein adjusting the diversity signal comprises changing amplitude of the diversity signal. 
     
     
         16 . The method of  claim 15  wherein amplifying the diversity signal includes equalizing an amplitude of cosite content of the diversity signal to be amplitude equalized with respect to an amplitude of cosite content of the first signal. 
     
     
         17 . The method of  claim 14  wherein adjusting the diversity signal comprises phase shifting the diversity signal. 
     
     
         18 . The method of  claim 17  wherein phase shifting the diversity signal includes aligning cosite content of the adjusted diversity signal anti-phase with respect to cosite content of the first signal when the adjusted diversity signal and the first signal are combined. 
     
     
         19 . The method of  claim 17  comprising attenuating the diversity signal prior to phase shifting the diversity signal. 
     
     
         20 . The method of  claim 17  wherein the phase shifting is of at least one type of: active, passive, variable, controlled and fixed. 
     
     
         21 . The method of  claim 14  wherein combining the adjusted diversity signal and the first signal includes providing the first signal to a combiner via a circulator. 
     
     
         22 . The method of  claim 14  wherein combining the adjusted diversity signal and the first signal includes at least one of: destructive combining of cosite contents of the adjusted diversity signal and the first signal; and
 constructive combining of the adjusted diversity signal and the first signal. 
 
     
     
         23 . The method of  claim 22  wherein the combining is conducted for plurality of frequencies. 
     
     
         24 . The method of  claim 14  comprising compensating a phase delay of the first signal. 
     
     
         25 . A method of receiving carrier aggregated signals comprising:
 forming carrier selected signals from inbound carrier aggregated signals, and   combining the carrier selected signals to form an output signal comprising an enhanced carrier aggregated signal.   
     
     
         26 . The method of  claim 25  wherein forming the carrier selected signals comprises forming and inverting a stop-band containing signal. 
     
     
         27 . The method of  claim 26  wherein forming the stop-band containing signal comprises forming a signal having a stop-band portion at a first frequency and translating the stop-band signal, including forming a mirror image of the stop-band portion to generate a translated stop-band portion and aligning the translated stop-band portion with respect to a carrier signal. 
     
     
         28 . The method of  claim 27  wherein aligning the translated stop-band portion with respect to the carrier signal comprises center frequency aligning, phase aligning and/or amplitude equalizing the translated stop-band portion with respect to the carrier signal. 
     
     
         29 . The method of  claim 25  comprising equalizing amplitude, adjusting phase, and adjusting delay of the carrier selected signals prior to the combining. 
     
     
         30 . The method of  claim 26  wherein forming the stop-band containing signal comprises forming a signal with a stop-band portion having a center frequency and width equal to that of a carrier signal. 
     
     
         31 . The method of  claim 25  further comprising performing blocker reduction. 
     
     
         32 . The method of  claim 31  wherein performing blocker reduction comprises combining signals from a primary receive chain and at least one diversity receive chain. 
     
     
         33 . The method of  claim 32  wherein at least one frequency of first receive chain signal is amplitude equalized and anti-phase aligned with respect to at least one frequency of second receive chain signal. 
     
     
         34 . The method in  claim 25  comprising performing tunable receiving. 
     
     
         35 . A tunable carrier-aggregating filter device comprising:
 a carrier selection stage comprising a plurality of tunable carrier selecting filters providing output signals that are combined to form a carrier aggregated output signal.   
     
     
         36 . The filter device of  claim 35  wherein the carrier selecting filter comprises a band-stop inverting type. 
     
     
         37 . The filter device of  claim 35  wherein the carrier selection stage comprises an oscillator and a mixer and/or a controller. 
     
     
         38 . The filter device of  claim 35  wherein the channel selection filter comprises a splitter, a passive line, an active line and a combiner. 
     
     
         39 . The filter device of  claim 38  wherein the active line comprises a phase shifter and an amplifier. 
     
     
         40 . The filter device in  claim 35  further comprising a blocker reduction stage prior to the carrier selection stage. 
     
     
         41 . The filter device of  claim 40  wherein the blocker reduction stage comprises a primary receive chain and a diversity receive chain, each connected to a combiner. 
     
     
         42 . The filter device of  claim 41  wherein the combiner is connected to a mixer. 
     
     
         43 . The filter device of  claim 41  wherein the diversity receive chain comprises a phase shifter and amplifier. 
     
     
         44 . The filter device of  claim 43  wherein the diversity receive chain comprises an attenuator. 
     
     
         45 . The filter device of  claim 41  wherein the primary receive chain comprises a blocker rejection element and/or a delay element. 
     
     
         46 . The filter device of  claim 41  wherein the primary receive chain includes a primary antenna and the diversity receive chain includes a diversity antenna.