Method and apparatus for processing signal

Abstract

The present invention relates to a method and device for processing signals, the core of which is: performing preamble detection on received baseband signals, outputting detected effective multipath information; and performing judgment processing according to the detected effective multipath information , and allocate multipath information of the signal to be demodulated according to the result of the decision processing; select the signal of the corresponding branch according to the allocated multipath information for demodulation and decoding. Through the present invention, demodulation and filtering can be performed directly on the basis of the received baseband signal, and there is no need to store longer demodulation data for possible signal frequency offset correction, thereby reducing hardware storage resources and data processing time delay. Moreover, the present invention considers that after the preamble is detected, all the branches with effective multipath information are demodulated, so that in the preamble detection process, the wrong demodulation branch is selected due to the false alarm and the signal is not brought. The demodulation performance is reduced, so the present invention can guarantee the signal access performance.

Description

Technical field [0001] The present invention relates to the field of communications, and in particular to a method and device for signal processing. Background technique [0002] In a mobile communication system, due to the relative movement of the UE and the base station, the frequency of the received signal will expand, which is called the Doppler effect. In most high-speed scenarios, the signal propagation between the base station and the UE is a direct line of sight, and the Doppler effect is directly reflected in the overall shift of the received signal frequency. When the base station is very close to the high-speed road, the angle between the user's moving direction and the signal propagation direction will be small, and signal reception will produce a large frequency deviation. [0003] The schematic diagram of frequency offset generation is as figure 1 As shown, when the base station is very close to the road, the angle between the user's moving direction and the signal...

AI Technical Summary

Problems solved by technology

However, due to the short transmission time of the access signal, the preamble is only 4096chips, and the message is only 10ms or 20ms, so before correcting the frequency offset of the received signal, a certain length of demodulation data must be stored and wait for the output of the frequency offset estimation

[0014] 2. When filtering after frequency offset estimation of continuous symbols, longer demodulation data needs to be stored, which increases hardware storage resources and data processing delay

[0015] If you need to obtain more reliable frequency offset, you can estimate the frequency offset for consecutive symbols and then perform filtering. This requires storing longer demodulation data, but the base station has special requirements for signal processing delay, especially to detect the preamble in time And feed back the downlink AI indicator signal, so hardware storage resources and processing delay requirements limit the performance of frequency offset estimation

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