Apparatuses and methods for detecting a group delay in a communication system

摘要

The exemplary embodiments of the present invention relate to a transmission part (500), to a receiver part (600), to a transceiver comprising the transmission and receiver parts, to a radio base station comprising the transceiver, to a method in the transmission part (500) and to a method in a receiver part (600). According to the embodiments of the present invention, the transmission part (500) is configured to generate calibration sequences; process the sequences to determine a resulting calibration signal prior to transmission to a receiver part for enabling the receiver part to detect group delay of the received resulting calibration signal for calibration of the transceiver and/or of the radio base station in a wideband communications system.

主权项

1. A transceiver for a radio base station of a wideband communication system, wherein said transceiver is configured to detect a group delay for performing calibration and comprises a transmission part that includes a circuit that is configured to:
split an available system bandwidth into multiple, J, groups of contiguous subcarriers, each group of contiguous subcarriers representing a subband of the available bandwidth; generate, for each subband, a constant amplitude zero auto correlation (CAZAC) calibration sequence having a predefined length, M, the CAZAC calibration sequence being generated in the time domain; convert each CAZAC calibration sequence into frequency domain by using an M-point fast fourier transformation (FFT) operation where M further represents the number of contiguous subcarriers for each subband; map each converted CAZAC calibration sequence into a dedicated subband; superimpose the mapped CAZAC calibration sequences to form a CAZAC calibration signal which is further transformed from the frequency domain into the time domain using an N-point inverse FFT (IFFT) operation, where N is a length of a symbol; append the transformed CAZAC calibration signal with a cyclic prefix (CP) to form a resulting CAZAC calibration signal; and upconvert the resulting CAZAC calibration signal to a carrier frequency prior to transmitting the upconverted resulting CAZAC calibration signal, said transmitted resulting CAZAC calibration signal passing through a radio frequency (RF) chain, which induces different group delays in subbands before reaching a receiver part of the transceiver.