Abstract
A transmitter in a radiocommunications system such as a Wideband Code Division Multiple Access (WCDMA) communications system transmits one set of data on an in-phase (I-) channel and another set of data on a quadrature (Q-) channel. The transmitter generates a gain signal beta and multiplies the digital data associated with the Q-channel by the gain signal beta . Complexity of the multiplication operation is reduced by limiting the gain signal beta to a finite nubmer of values that are exactly representable by a predefined number of bits such as 4-bit values to the right of a binary radix point. Modulation inaccuracy associated with quantization of beta can be eliminated by utilizing the same quantized values of beta in all components within the radiocommunications system.
A transmitter in a radiocommunications system such as a Wideband Code Division Multiple Access (WCDMA) communications system transmits one set of data on an in-phase (I-) channel and another set of data on a quadrature (Q-) channel. The transmitter generates a gain signal ? and multiplies the digital data associated with the Q-channel by the gain signal ?. Complexity of the multiplication operation is reduced by limiting the gain signal ? to a finite nubmer of values that are exactly representable by a predefined number of bits such as 4-bit values to the right of a binary radix point. Modulation inaccuracy associated with quantization of ? can be eliminated by utilizing the same quantized values of ? in all components within the radiocommunications system.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| Not Available | 23/05/2002 | ISLD-200205-001 | ERICSSON INC | No | Family Member | ||||
| Not Available | 20/07/2014 | ISLD-201409-041 | OPTIS | No | Family Member | ||||
Specification Information
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Technologies
Product
Use Cases
Services
Claim
1. An apparatus for use in a transmitter, the apparatus comprising: means for receiving digital data associated with an in-phase (I-) channel; means for receiving digital data associated with a quadrature (Q-) channel; means for generating a gain signal, âx95¬âx96x93; means for multiplying the digital data associated with the Q-channel by the gain signal, âx95¬âx96x93, wherein the gain signal, âx95¬âx96x93, represents a gain value that is exactly representable by 4-bit signals to the right of a binary radix point.
2. The apparatus of claim 1, wherein the transmitter is for use in a radiocommunications system that requires the use of only those gain values that are exactly representable by 4-bit signals to the right of the binary radix point.
3. The apparatus of claim 1, wherein the gain signal, âx95¬âx96x93, is selected by allowing âx95¬âx96x93 to exactly represent an ideal gain value, PIDEAL> whenever the ideal gain value is exactly representable by 4-bit signals to the right of the binary radix point, and in all other cases by rounding âx95¬âx96x93 up to the next higher number that is representable by 4-bit signals to the right of the binary radix point.
4. The apparatus of claim 3, wherein the ideal gain value, âx95¬âx96x93 DEAL > *s a function of a ratio of a data rate of the digital data associated with the I-channel over a data rate of the digital data associated with the Q-channel.
5. A method for use in a transmitter, -the method comprising the steps of: receiving digital data associated with an in-phase (I-) channel; receiving digital data associated with a quadrature (Q-) channel; generating a gain signal, âx95¬âx96x93; multiplying the digital data associated with the Q-channel by the gain signal, âx95¬âx96x93, wherein the gain signal, âx95¬âx96x93, represents a gain value that is exactly representable by 4-bit signals to the right of a binary radix point.
6. The method of claim 5, wherein the transmitter is for use in a radiocommunications system that requires the use of only those gain values that are exactly representable by 4-bit signals to the right of the binary radix point.
7. The method of claim 5, wherein the step of generating a gain signal comprises the steps of: selecting the gain signal, âx95¬âx96x93, by allowing âx95¬âx96x93 to exactly represent an ideal gain value, âx95¬âx96x93 IDEAL > whenever the ideal gain value is exactly representable by 4-bit signals to the right of the binary radix point, and in all other cases by rounding âx95¬âx96x93 up to the next higher number that is representable by 4-bit signals to the right of the binary radix point.', "8. The method of claim 7, wherein the ideal gain value, âx95¬âx96x93rDEAL' *s a function of a ratio of a data rate of the digital data associated with the I-channel over a data rate of the digital data associated with the Q-channel."]
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.