Frequency shift error compensation method and device for multi-carrier receiver

Abstract

The present disclosure provides a frequency offset compensation technique for use by a multi-carrier receiver. Compared with legacy receiver designs, the technique introduces a new function which correlates various frequency offsets of the different carriers involved in multi-carrier signal transmission and reception. This new function can be coupled with an Automatic Frequency Control (AFC) function which can then utilize the correlation information provided by the new function to achieve significantly better frequency error / offset estimation when the carriers are correlated. As a method aspect, the frequency offset compensation technique comprises the steps of receiving signals modulated on a plurality of carrier frequencies, deriving a frequency offset for each carrier frequency to thereby provide a plurality of frequency offsets corresponding to the plurality of carrier frequencies; correlating these plurality of frequency offsets; and controlling compensation of the frequency offsets based on a result of the correlation.

Description

technical field [0001] The present invention relates to wireless communication systems. In particular, the present invention relates to frequency shift compensation technology for multi-carrier communication systems. Background technique [0002] Universal Mobile Telecommunications System (UMTS) is a wireless communication system widely used at present. In UMTS, as in any other wireless system, in the transmitter a frequency between the transmitter (e.g. base station) and receiver (e.g. user terminal) is introduced due to Doppler shift in the wireless channel error or bias. This frequency offset can lead to degraded communication performance at the receiver, such as an increase in bit error rate and a decrease in throughput. Therefore, it is desirable to be able to compensate for these frequency offsets at the receiver, for example to minimize the frequency offset, in order to achieve optimum performance. [0003] Developers and operators of wireless communication system...

AI Technical Summary

Problems solved by technology

There is currently no 3GPP requirement on relative frequency error of base stations, however, it can be assumed that base stations using the same source to generate frequency can have relative frequency error below 0.1ppm, because it can be obtained from the final value of relative frequency error of user terminal Eliminate errors introduced in the source

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