# US 6,294,956 B1 · System and method for producing amplified signal(s) or version(s) thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,294,956 B1 - Document ID: US6294956B1 - Status: Granted - Kind: B1 - Application number: 09/444,318 - Filed: 1999-11-19 - Granted: 2001-09-25 - Earliest claimed: 1999-11-19 - Assignees: Lucent Technologies Inc. - Inventors: Reza Ghanadan; Kyriaki Konstantinou; Norman Gerard Ziesse - Web page: https://patentgrep.com/patent/US6294956B1 ## CPC - H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)} - H03F 3/602: {Combinations of several amplifiers} - H03F 2200/198: A hybrid coupler being used as coupling circuit between stages of an amplifier circuit - H03F: AMPLIFIERS ## Abstract A signal amplification system involves transforming at least one signal to be amplified into at least one transformed signal which is amplified and the resulting amplified transformed signal(s) can be used to produce a version(s) of the at least one original signal. The at least one transformed signal can be produced from the at least one original signal by using the at least one original signal to amplitude and/or angle (phase or frequency) modulate the at least one original signal. After amplification of the at least one transformed signal, the resulting at least one amplified transformed signal is de-modulated to produce a version(s) of the at least one signal. In transforming the at least one original signal to produce the at least one transformed signal, the at least one original signal is transformed into a more desirable form, such as a more power efficient form, for amplification. By amplifying the at least one transformed signal, more efficient and/or less costly amplifier(s) can be used to amplify the at least one signal in a linear fashion. Depending on the embodiment, at least one signal to be amplified can be transformed into at least one transformed signal by combining offset versions of the at least one original signal to produce the at least one transformed signal having the energy of the at least one signal spread in time and/or to produce the at least one transformed signal having a reduced peak to average power ratio(s)(PAR). Multiple signals to be amplified can be transformed into at least one transformed signal by combining the multiple signals, for example to produce the at least one transformed signal having a reduced peak to average power ratio(s) (PARs). After the at least one transformed signal is amplified, the resulting signal(s) can be de-modulated, inversely transformed, de-spread or reconstructed to recover a version(s) of the original signal(s). ## Claims ### Claim 1 A method of producing at least one signal, said method comprising; splitting the signal to be amplified to produce first and second versions; delaying the second version within a delay circuit to produce a time-delayed version of the first version; combining the first version and time-delayed version within a combiner to produce a first transformed signal and second transformed signal having reduced peak-to-average power ratios; and amplifying said transformed signals to be later inversely transformed. ### Claim 2 (depends on 1) The method of claim 1 wherein said transforming further including: transforming said at least one signal into at least one transformed signal using an invertible transformation of said at least one signal. ### Claim 3 (depends on 1) The method of claim 1 wherein said transforming further including: transforming said at least one signal into transformed signals which are correlated. ### Claim 4 (depends on 1) The method of claim 1 wherein said transforming further including: transforming said at least one signal into transformed signals by combining delayed versions of said at least one signal. ### Claim 5 (depends on 1) The method of claim 1 wherein said transforming further including: producing said at least one transformed signal as an invertible function of said signal. ### Claim 6 (depends on 1) The method of claim 1 further including: providing said at least one amplified transformed signal for transmission. ### Claim 7 (depends on 6) The method of claim 6 further including: performing an inverse transformation of said at least one amplified transformed signals at a receiver to produce a version of said at least one signal. ### Claim 8 (depends on 1) The method of claim 1 further including: performing an inverse transformation on said at least one amplified transformed signal to produce an amplified signal. ### Claim 9 (depends on 8) The method of claim 8 further including: providing said at least one amplified transformed signal for transmission. ### Claim 10 (depends on 8) The method of claim 8 wherein said performing including: de-spreading the energy of said at least one amplified transformed signal in time. ### Claim 11 A method of producing at least one signal, said method comprising: splitting the signal to be amplified to produce first and second versions; delaying the second version within a delay circuit to produce a time-delayed version of the first version; combining the first version and time-delayed version within a combiner to produce at least one transformed signal having a reduced peak-to-average ratio; and amplifying said at least one transformed signal to be later inversely transformed. ### Claim 12 (depends on 11) The method of claim 11 wherein said transforming further including: transforming said at least one signal into at least one transformed signal by combining versions of said at least one signal. ### Claim 13 (depends on 12) The method of claim 12 wherein said transforming further including: transforming said at least one signal into at least one transformed signal by combining versions of said at least one signal which are offset. ### Claim 14 (depends on 12) The method of claim 12 wherein said transforming further including: transforming said at least one signal into at least one transformed signal by combining versions of said at least one signal which are offset in time. ### Claim 15 (depends on 12) The method of claim 12 wherein said transforming further including: transforming said at least one signal into at least one transformed signal by combining versions of said at least one signal which are offset in phase. ### Claim 16 (depends on 12) The method of claim 12 wherein said transforming further including: transforming said at least one signal into at least one transformed signal by combining versions of said at least one signal which are offset in frequency. ### Claim 17 (depends on 11) The method of claim 11 wherein said transforming further including: transforming signals into at least one transformed signal by combining different of said signals. ### Claim 18 (depends on 11) The method of claim 11 further including: providing said at least one amplified transformed signal or a processed version thereof for transmission. ### Claim 19 (depends on 11) The method of claim 11 further including: performing at least a portion of an inverse transformation of said at least one amplified transformed signals or a processed version thereof at a receiver to produce a version of said signal. ### Claim 20 (depends on 11) The method of claim 11 further including: performing an inverse transformation on said at least one amplified transformed signal to produce an amplified signal. ### Claim 21 A method of producing a signal, said method comprising: splitting the signal to be amplified to produce first and second versions; delaying the second version within a delay circuit to produce a time-delayed version of the first version; combining the first version and time-delayed version within a combiner to produce at least one transformed signal having a reduced peak-to-average ratio; amplifying said at least one transformed signal into at least one amplified transformed signal; and constructing at least one amplified signal from said at least one amplified transformed signal by inverse transformation. ### Claim 22 (depends on 21) The method of claim 21 wherein said transforming comprises: transforming said at least one signal to be amplified into at least one transformed signal which is an invertible function of said at least one signal. ### Claim 23 A method of producing versions of a signal, said method comprising: transforming a signal to be amplified into transformed signals by splitting the signal to be amplified to produce first and second versions; delaying the second version within a delay circuit to produce a time-delayed version of the first version; combining the first version and time-delayed version within a combiner to produce a first transformed signal and second transformed signal having reduced peak-to-average power ratios; amplifying said transformed signals into amplified transformed signals; and processing said amplified transformed signals to produce versions of said signal having a relative delay for transmission on separate antennas. ### Claim 24 A method of producing signals on separate antennas, said method comprising: transforming at least one signal to be amplified into transformed signals by splitting the signal to be amplified to produce first and second versions; delaying the second version within a delay circuit to produce a time-delayed version of the first version; combining the first version and time-delayed version within a combiner to produce a first transformed signal and second transformed signal having reduced peak-to-average power ratios; amplifying said transformed signals into amplified transformed signals; and providing said amplified transformed signals for transmission so said amplified transformed signals or processed versions thereof are transmitted on separate antennas. ### Claim 25 An apparatus for producing a signal comprising: a splitter for receiving a signal and splitting the signal into first and second versions on first and second paths; a delay circuit positioned on the second path for delaying the second version to produce a delayed in time version; a combiner for receiving the first version and second delayed in time version and producing at least one transformed signal having a reduced peak-to-average power ratio; and an amplifier circuit for receiving and amplifying the at least one transformed signal to be later inversely transformed. ### Claim 26 (depends on 25) An apparatus according to claim 25, wherein said amplifier circuit further comprises first and second amplifiers for receiving transformed signals. ### Claim 27 (depends on 25) An apparatus according to claim 25, and further comprising an inverse combiner circuit for reconstructing an original signal from the transformed signals after having been amplified. ### Claim 28 (depends on 25) An apparatus according to claim 25, wherein said inverse combiner circuit further comprises a delay circuit.