Configurable non-linear filter for digital pre-distortion
AssigneeAnalog Devices International Unlimited Company
InventorsAnand Venkitasubramani, Stephen Summerfield, Bhavana Muralikrishna, Praveen Chandrasekaran
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Abstract
Some embodiments herein describe a radio frequency communication system that can include a transmitter to output an radio frequency (RF) transmit signal, the transmitter including a digital pre-distortion system (DPD) that pre-distorts the RF transmit signal. The DPD system can include a configurable non-linear filter, such as a Laguerre filter, having multiple rows where at least one row operates with a configurable decimation ratio. The DPD system can further include decimators and a crossbar switch coupled between the decimators.
Claims22
A radio frequency (RF) communication system comprising:
- a transmitter configured to output an RF transmit signal;
- and
- a power amplifier configured to amplify the RF transmit signal,
- wherein the transmitter comprises a digital pre-distortion (DPD) system configured to pre-distort the RF transmit signal, the DPD system including a configurable non-linear filter having a plurality of rows in which at least one row operates with a configurable decimation ratio.
A transmitter for an RF communication system, the transmitter comprising:
- a digital transmit circuit configured to generate an in-phase (I) transmit signal and a quadrature-phase (Q) transmit signal,
- wherein the digital transmit circuit comprises a digital pre-distortion (DPD) system configured to pre-distort the I transmit signal and the Q transmit signal to compensate for downstream power amplifier non-linearity,
- wherein the digital pre-distortion system includes a non-linear filter having a plurality of rows in which at least one row operates with a configurable decimation ratio.
A method of digital pre-distortion in an RF communication system, the method comprising:
- generating an in-phase (I) transmit signal and a quadrature-phase (Q) transmit signal;
- pre-distorting the I transmit signal and the Q transmit signal to compensate for a non-linearity of a power amplifier using a digital pre-distortion (DPD) system;
- and
- configuring a decimation ratio of at least one row of a non-linear filter of the digital pre-distortion system.
Dependencies are inferred from the claim text.