Digitally Assisted Feedforward Compensation of Cartesian-Feedback Power-Amplifier Systems
This brief describes digitally assisted feedforward compensation to extend the bandwidth and to enhance the in-band linearity of Cartesian-feedback (CFB) power-amplifier (PA) systems. The proposed technique combines the strength of the CFB, which is chiefly relaxed PA modeling requirements, with the...
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| Veröffentlicht in: | IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2011-08, Vol.58 (8), p.457-461 |
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| container_title | IEEE transactions on circuits and systems. II, Express briefs |
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| creator | Boo, H. H. SungWon Chung Dawson, J. L. |
| description | This brief describes digitally assisted feedforward compensation to extend the bandwidth and to enhance the in-band linearity of Cartesian-feedback (CFB) power-amplifier (PA) systems. The proposed technique combines the strength of the CFB, which is chiefly relaxed PA modeling requirements, with the increased speed of digital predistortion (DPD). CFB is used initially to train efficiently a lookup table for a predistorted feedforward path. Then, both the CFB and the predistorted feedforward path run simultaneously during transmission. Viewed as a bandwidth-enhancement technique for analog CFB, the feedforward-compensated system shows a linearization bandwidth improvement of almost six times over the unaided feedback system. Viewed as a means of improving the in-band linearity of CFB, the proposed system realizes up to 10 dB of reduction in distortion products over CFB or DPD alone and does so without compromising the stability of the feedback system. |
| doi_str_mv | 10.1109/TCSII.2011.2158274 |
| format | Article |
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Viewed as a means of improving the in-band linearity of CFB, the proposed system realizes up to 10 dB of reduction in distortion products over CFB or DPD alone and does so without compromising the stability of the feedback system.</description><identifier>ISSN: 1549-7747</identifier><identifier>EISSN: 1558-3791</identifier><identifier>DOI: 10.1109/TCSII.2011.2158274</identifier><identifier>CODEN: ICSPE5</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Amplitude modulation ; Bandwidth ; Cartesian feedback (CFB) ; Compensation ; digital predistortion (DPD) ; digitally assisted ; Distortion ; Feedback ; Feedback loop ; Feedforward ; Feedforward neural networks ; intermodulation distortion ; Linearity ; Mathematical models ; Noise levels ; power-amplifier (PA) linearization ; Predistortion ; Table lookup</subject><ispartof>IEEE transactions on circuits and systems. II, Express briefs, 2011-08, Vol.58 (8), p.457-461</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) Aug 2011</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c326t-8200c34584ba746833b6c8e01dd0a25e9bd7bd11fb1b273e17b4b2458aacfd893</citedby><cites>FETCH-LOGICAL-c326t-8200c34584ba746833b6c8e01dd0a25e9bd7bd11fb1b273e17b4b2458aacfd893</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/5983324$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>315,781,785,797,27929,27930,54763</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/5983324$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Boo, H. H.</creatorcontrib><creatorcontrib>SungWon Chung</creatorcontrib><creatorcontrib>Dawson, J. L.</creatorcontrib><title>Digitally Assisted Feedforward Compensation of Cartesian-Feedback Power-Amplifier Systems</title><title>IEEE transactions on circuits and systems. II, Express briefs</title><addtitle>TCSII</addtitle><description>This brief describes digitally assisted feedforward compensation to extend the bandwidth and to enhance the in-band linearity of Cartesian-feedback (CFB) power-amplifier (PA) systems. The proposed technique combines the strength of the CFB, which is chiefly relaxed PA modeling requirements, with the increased speed of digital predistortion (DPD). CFB is used initially to train efficiently a lookup table for a predistorted feedforward path. Then, both the CFB and the predistorted feedforward path run simultaneously during transmission. Viewed as a bandwidth-enhancement technique for analog CFB, the feedforward-compensated system shows a linearization bandwidth improvement of almost six times over the unaided feedback system. Viewed as a means of improving the in-band linearity of CFB, the proposed system realizes up to 10 dB of reduction in distortion products over CFB or DPD alone and does so without compromising the stability of the feedback system.</description><subject>Amplitude modulation</subject><subject>Bandwidth</subject><subject>Cartesian feedback (CFB)</subject><subject>Compensation</subject><subject>digital predistortion (DPD)</subject><subject>digitally assisted</subject><subject>Distortion</subject><subject>Feedback</subject><subject>Feedback loop</subject><subject>Feedforward</subject><subject>Feedforward neural networks</subject><subject>intermodulation distortion</subject><subject>Linearity</subject><subject>Mathematical models</subject><subject>Noise levels</subject><subject>power-amplifier (PA) linearization</subject><subject>Predistortion</subject><subject>Table lookup</subject><issn>1549-7747</issn><issn>1558-3791</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpdkD1PwzAQhi0EEqXwB2CJWJhS_JU4HqtAoRISSC0DU2QnF-SSxMFOVfXf49CKgelueN5Xdw9C1wTPCMHyfp2vlssZxYTMKEkyKvgJmpAkyWImJDkddy5jIbg4RxfebzCmEjM6QR8P5tMMqmn20dx74weoogVAVVu3U66Kctv20Hk1GNtFto5y5QbwRnXxSGlVfkVvdgcunrd9Y2oDLlrtQ0vrL9FZrRoPV8c5Re-Lx3X-HL-8Pi3z-UtcMpoOcUYxLhlPMq6V4GnGmE7LDDCpKqxoAlJXQleE1JpoKhgQobmmgVeqrKtMsim6O_T2zn5vwQ9Fa3wJTaM6sFtfSCIlTknITtHtP3Jjt64LxwUoDe4SngSIHqDSWe8d1EXvTKvcviC4GF0Xv66L0XVxdB1CN4eQAYC_QCLDN5SzHxtHey4</recordid><startdate>20110801</startdate><enddate>20110801</enddate><creator>Boo, H. 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H.</creatorcontrib><creatorcontrib>SungWon Chung</creatorcontrib><creatorcontrib>Dawson, J. L.</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><jtitle>IEEE transactions on circuits and systems. II, Express briefs</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Boo, H. H.</au><au>SungWon Chung</au><au>Dawson, J. L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Digitally Assisted Feedforward Compensation of Cartesian-Feedback Power-Amplifier Systems</atitle><jtitle>IEEE transactions on circuits and systems. II, Express briefs</jtitle><stitle>TCSII</stitle><date>2011-08-01</date><risdate>2011</risdate><volume>58</volume><issue>8</issue><spage>457</spage><epage>461</epage><pages>457-461</pages><issn>1549-7747</issn><eissn>1558-3791</eissn><coden>ICSPE5</coden><abstract>This brief describes digitally assisted feedforward compensation to extend the bandwidth and to enhance the in-band linearity of Cartesian-feedback (CFB) power-amplifier (PA) systems. The proposed technique combines the strength of the CFB, which is chiefly relaxed PA modeling requirements, with the increased speed of digital predistortion (DPD). CFB is used initially to train efficiently a lookup table for a predistorted feedforward path. Then, both the CFB and the predistorted feedforward path run simultaneously during transmission. Viewed as a bandwidth-enhancement technique for analog CFB, the feedforward-compensated system shows a linearization bandwidth improvement of almost six times over the unaided feedback system. Viewed as a means of improving the in-band linearity of CFB, the proposed system realizes up to 10 dB of reduction in distortion products over CFB or DPD alone and does so without compromising the stability of the feedback system.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TCSII.2011.2158274</doi><tpages>5</tpages></addata></record> |
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| identifier | ISSN: 1549-7747 |
| ispartof | IEEE transactions on circuits and systems. II, Express briefs, 2011-08, Vol.58 (8), p.457-461 |
| issn | 1549-7747 1558-3791 |
| language | eng |
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| source | IEEE Electronic Library (IEL) |
| subjects | Amplitude modulation Bandwidth Cartesian feedback (CFB) Compensation digital predistortion (DPD) digitally assisted Distortion Feedback Feedback loop Feedforward Feedforward neural networks intermodulation distortion Linearity Mathematical models Noise levels power-amplifier (PA) linearization Predistortion Table lookup |
| title | Digitally Assisted Feedforward Compensation of Cartesian-Feedback Power-Amplifier Systems |
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