Reception diversity method and system thereof

Abstract

The invention relates to a reception diversity method and a system thereof. The method comprises the following steps of: converting radio frequency signals received by n receiving antennae into n paths of base band signals; performing timing and carrier deviation estimation on each path of base band signal, and weighting and combining evaluated estimation values so as to obtain a united timing and carrier deviation estimation value of each path of base band signal; weighing and averaging the united timing and carrier deviation estimation value and a timing and carrier deviation estimated value so as to obtain average timing and average carrier deviation estimated values of each path of base band signal; and correcting each path of base band data, performing channel estimation and balancing on the base band data, performing de-mapping, de-interlacing, channel decoding and code descrambling, and outputting a processed transport stream. The method ensures synchronization and channel estimation quality under the condition that signals received by one or more paths of antennae are very poor, ensures receiving performance and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of digital multimedia reception, in particular to a reception classification method and system thereof. Background technique [0002] Equalization techniques are usually used in broadband wireless transmission to combat time-varying fading and multipath interference experienced by digital multimedia signals during transmission. When the channel environment is worse, in order to combat greater time-varying fading and multipath interference, diversity reception technology is usually used, which extracts useful information related to the transmitted signal from these copies by adding multiple copies of the received signal , so as to restore the transmitted signal correctly to the greatest extent. Different replicas pass through different channel characteristics, and the diversity technology uses this to ensure that the received signal can be demodulated normally in harsh environments. [0003] Since the incon...

AI Technical Summary

Problems solved by technology

First, it attenuates the useful signal and causes a time-varying phase change. At the same time, the sampling clock frequency deviation will inevitably cause a linear increase in the frame timing error, deteriorating the frame synchronization problem, and the receiver must track it

Second, sampling clock errors cause inter-carrier interference (ICI)

[0005] The estimation of timing frequency offset and carrier frequency offset is crucial to the performance of the receiver, and the receive diversity system is generally used in the case of very bad channel environment, the existing algorithm of timing frequency offset and carrier frequency offset estimation is here In this case, it is not well estimated, which affects the performance of the receiver

In extreme cases, if one or more antennas are out of sync, the receiver will not work properly

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