Predistortion with sectioned basis functions
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0402643
(2009-03-12)
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등록번호 |
US-8369447
(2013-02-05)
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발명자
/ 주소 |
- Fuller, Arthur Thomas Gerald
- Morris, Bradley John
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
4 |
초록
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A predistortion actuator is provided. The predistortion actuator includes a plurality of branches, each of which implements a basis function that acts on a digital input signal. For at least one of the branches, the respective basis function is a sectioned basis function, where each section of the s
A predistortion actuator is provided. The predistortion actuator includes a plurality of branches, each of which implements a basis function that acts on a digital input signal. For at least one of the branches, the respective basis function is a sectioned basis function, where each section of the sectioned basis function corresponds to a respective section of a range of at least one input signal characteristic associated with the digital input signal, such as a value range of a magnitude, a temporal characteristic, or a hybrid of the two. A power amplifier system including the predistortion actuator is also provided. Utilizing sectioned basis functions can potentially reduce the hardware resources necessary to realize the predistortion actuator relative to conventional global basis functions. In addition, signal conditioning during coefficient training can potentially be used to reduce the dynamic range of coefficients associated with each sectioned basis function.
대표청구항
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1. A predistortion actuator for predistorting a digital input signal, the predistortion actuator comprising: a plurality of branches that each implement a respective basis function, wherein for each of at least one of the plurality of branches, the respective basis function is a sectioned basis func
1. A predistortion actuator for predistorting a digital input signal, the predistortion actuator comprising: a plurality of branches that each implement a respective basis function, wherein for each of at least one of the plurality of branches, the respective basis function is a sectioned basis function having a respective distinct definition for each section of a respective plurality of sections, the respective plurality of sections defining a range of at least one input signal characteristic associated with the digital input signal. 2. The predistortion actuator of claim 1, wherein the at least one of the plurality of branches comprises all of the plurality of branches. 3. The predistortion actuator of claim 2, wherein the respective plurality of sections is the same for each of the plurality of branches. 4. The predistortion actuator of claim 1, wherein the at least one input signal characteristic comprises magnitude of the digital input signal, such that each sectioned basis function has a respective distinct definition for each section of a respective plurality of sections defining a magnitude range of the digital input signal. 5. The predistortion actuator of claim 1, wherein the at least one input signal characteristic comprises a temporal characteristic of the digital input signal, such that each sectioned basis function has a respective distinct definition for each section of a respective plurality of sections defining a time period relative to some time marker associated with the digital input signal. 6. The predistortion actuator of claim 1, wherein the at least one input signal characteristic comprises a temporal characteristic of the digital input signal and magnitude of the digital input signal, such that each sectioned basis function has a respective distinct definition for each section of a plurality of sections defining both: a) a time period relative to some time marker associated with the digital input signal; andb) a magnitude range of the digital input signal. 7. The predistortion actuator of claim 1, wherein each sectioned basis function comprises a normalization factor that is held constant across each of the respective plurality of sections. 8. The predistortion actuator of claim 1, wherein each sectioned basis function comprises a normalization factor that varies on at least one of: a per section basis; anda per branch basis. 9. The predistortion actuator of claim 1, wherein each sectioned basis function is implemented according to: ƒk(x(n),φ)=x(n)(normEnv(x(n),φ)k(upperSecVal(φ)−lowerSecVal(φ))+lowerSecVal(φ))sFact(k,φ), where normEnv(x(n),ϕ)=x(n)-lowerSecVal(ϕ)upperSecVal(ϕ)-lowerSecVal(ϕ), where k is a branch number, x(n) is the input signal, φ is a section number that is determined in accordance with lowerSecVal(φ)≦|x(n)|
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