Systems and methods for radio frequency calibration exploiting channel reciprocity in distributed input distributed output wireless communications
US-12166546-B2 · Dec 10, 2024 · US
High-frequency signal processor and wireless communication system
US9214980B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9214980-B2 |
| Application number | US-201514638463-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 4, 2015 |
| Priority date | Nov 1, 2011 |
| Publication date | Dec 15, 2015 |
| Grant date | Dec 15, 2015 |
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Abstract
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There is a need to reduce secondary intermodulation distortion that may occur in a reception circuit of a high-frequency signal processor and a wireless communication system having the same. In test mode, for example, a test signal generating circuit TSGEN generates a test signal RFtst at f_tx±0.5 MHz. The test signal RFtst is input to a mixer circuit MIXrx_I (MIXrx_Q). A correction circuit block CALBK detects an IM2 component resulting from the MIXrx_I (MIXrx_Q). The CALBK varies a differential balance for the MIXrx_I (MIXrx_Q) and concurrently monitors a phase for the IM2 component resulting from MIXrx_I (MIXrx_Q). The CALBK searches for the differential balance corresponding to a transition point that allows the phase to transition by approximately 180°. The MIXrx_I (MIXrx_Q) operates in normal mode using the differential balance as a search result.
First claim
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What is claimed is: 1. A high-frequency signal processor circuitry provided with a first operation mode and a second operation mode, the high-frequency signal processor circuit comprising: a test signal generating circuit that generates a test signal having a first frequency component and a second frequency component; a first switch that transmits a signal received as a first signal at an antenna in the first operation mode and transmits the test signal as the first signal in t…
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- What does patent US9214980B2 cover?
- There is a need to reduce secondary intermodulation distortion that may occur in a reception circuit of a high-frequency signal processor and a wireless communication system having the same. In test mode, for example, a test signal generating circuit TSGEN generates a test signal RFtst at f_tx±0.5 MHz. The test signal RFtst is input to a mixer circuit MIXrx_I (MIXrx_Q). A correction circuit blo…
- Who is the assignee on this patent?
- Renesas Electronics Corp
- What technology area does this patent fall under?
- Primary CPC classification H04B17/11. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 15 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).