Method and apparatus for diversity reception by ground digital television broadcast transmission system

Abstract

The invention discloses a diversity reception device and a method of a terrestrial digital television broadcast transmission system, wherein the device comprises a diversity signal channel tracker used for tracking the signal channel change of diversity signals and a diversity signal channel equalizer connected with the diversity signal channel tracker and used for withstanding multipath of the signal channel; the diversity signal channel tracker comprises N diversity signal channel tracking units corresponding to N-path diversity signals (N is not less than 2); and the diversity signal channel equalizer comprises N feedforward filters, feedback filters, and combination devices which combines the outputs of the N feedforward filters with the signals of the feedback filters. The invention can greatly improve the robustness of a terrestrial digital television broadcast single carrier receiving system, compared with the prior art, the invention can achieve the goals of greatly improving the sensitivity of receivers and reducing the error rate under the condition of poor dynamic signal channels.

Description

technical field [0001] The present invention relates to a method in the field of mobile communication, and specifically refers to a method and device for diversity reception. Background technique [0002] The microwave transmission environment has great limitations on the performance of mobile communications. In the actual microwave wireless communication environment, the channel often has the characteristics of time dispersion and frequency dispersion, and the transmitted signal will be seriously interfered by the channel. This time dispersion of the wireless channel is caused by multipath propagation, which is called multipath effect. The multipath effect causes the wideband signal to produce intersymbol interference, resulting in frequency selective fading. The frequency dispersion of the channel makes the channel characteristics change dynamically at a certain frequency. [0003] The single-carrier receiving system of terrestrial digital TV broadcasting usually adopts...

AI Technical Summary

Problems solved by technology

This algorithm requires that the channel characteristics of the two diversity branches are consistent, that is, the number of multipaths and the relative multipath delay are the same, which limits the method of obtaining diversity branches.

Otherwise, due to the inconsistency of the channel characteristics of the two branches, the equivalent channel fading of the received signal becomes more complicated. Although the independence of the diversity branch can suppress the error diffusion, the complexity of the equivalent channel makes the diversity Channel equalizer cannot obtain effective diversity gain

At the same time, this method does not consider its requirements for timing synchronization modules

Due to the need to align the multipath positions of the two-way signals and eliminate the relative time delay of the two-way signals, synchronization must also be achieved between the two timing synchronization modules, which increases the complexity of the timing synchronization module design, and each diversity in the prior art The timing synchronization module of the branch must eliminate the relative time delay of each diversity branch signal. When the number of diversity branches N>2, the design of the timing module will be very complicated, and even cannot be realized in practical applications

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