A Transmitter Branch Phase Mismatch Detection and Correction System

Abstract

The invention provides a transmitter branch phase mismatch detection and correction system comprising a signal separation module, a first signal path, a second signal path, a digital clock and a feedback signal path. Input signals (s) are decomposed into two paths of constant envelope and phase value variable signals by the signal separation module to act as the input signals of the first and second signal paths respectively according to the signal separation principle, and first and second phases (P1 and P2) are outputted. The first and second signal paths are used for transmitting the signals. Output of the digital clock is respectively connected with first and second numerical control time delay modules. The feedback signal path comprises a down conversion module, a low-pass filter, an analog-to-digital converter and a detection module. The mismatch value between the two branches can be effectively detected by the system and can be compensated back to the corresponding branches so that in-band distortion and out-band interference can be reduced to the highest possibility, and an LINC technology can be optimized.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a branch phase mismatch detection and correction system of a LINC transmitter. Background technique [0002] With the continuous improvement of data transmission rate requirements of modern communication systems, multi-carrier modulation methods are used in various emerging standards, such as Orthogonal Frequency Division Multiplexing (OFDM), although such modulation methods can effectively improve spectrum utilization The rate increases the data rate, but the transmitted signal has a larger peak-to-average ratio. In order to ensure the linear amplification of the transmitted signal, it is necessary to use a linear power amplifier with good linearity but low efficiency, such as a class A power amplifier. Such selection will worsen the power consumption of the transmitter. For portable handheld devices or devices that are not easy to replace the battery frequently, the high p...

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Problems solved by technology

[0004] However, the difficulty encountered by LINC technology is that there will be mismatch between the two branches, that is, the gain and phase of the two branches are inconsistent, which will cause serious in-band distortion and out-of-band interference in the final composite signal

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