Repeater

Abstract

The invention discloses a repeater station, comprising a receiving side radio frequency processing unit, a first digital down conversion (DDC) unit, a base band processing unit, a digital up conversion (DUC) unit, a transmitting side radio frequency processing unit and a power amplification processing unit. The repeater station serves as reference signals ref which are directly produced by the base band processing unit itself for the closed-loop control to echo elimination, namely, base band digital signals serve as the reference signals ref for participating in the processing of echo elimination, thereby simplifying the processing complexity of echo elimination: on the one hand, the system complexity is greatly reduced because a hardware circuit need not be added for processing the reference signals, and on the other hand, the echo elimination effect can be guaranteed. Moreover, the base band processing unit has rather small delay.

Description

technical field [0001] The invention relates to mobile multimedia technology, in particular to a repeater. Background technique [0002] China Mobile Multimedia Broadcasting Technology Alliance is referred to as China Mobile Multimedia Broadcasting (CMMB, China Mobile Multimedia Broadcasting). As a technical system serving China Mobile Multimedia Broadcasting, it aims to develop multimedia receiving technologies and equipment suitable for mobile applications. [0003] In the networking of digital multimedia broadcasting, it is often necessary to expand signal coverage and fill signal coverage blind spots. For example, due to the shadow effect of wireless transmission, blind spots of wireless broadcast signals are often formed behind or in the middle of high-rise buildings; or Under the premise that the power of the base station is limited, it is necessary to increase the coverage and so on. For these needs, the use of repeaters is extremely effective. [0004] The main fun...

AI Technical Summary

Problems solved by technology

In this case, in order to better suppress echo interference, higher isolation requirements must be put forward for engineering installations. For example, buildings need to be used for physical isolation of space, and the antenna on the receiving side is separated from the antenna on the transmitting side. Not only increases the cost of manpower and material resources, but also the suppression effect on echo interference is not ideal

[0006] In the previous application with the Chinese patent application number CN200610147225.5 and the title of the invention "Multipath Echo Cancellation Method for Digital Multimedia Broadcasting Repeater", in order to eliminate the coupling between the transmitting antenna and the receiving antenna of the repeater The echo interference of the repeater leads back the radio frequency signal from the transmitting antenna of the repeater as a reference signal for the closed-loop control of the echo cancellation, which undoubtedly increases the complexity of the system, and due to the increase of the hardware circuit for processing the reference signal, also reduces the effect of echo cancellation

Moreover, there is no limitation on repeater delay issues in this prior application

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