Method and system for demodulation in Multi-user Reusing One Slot operation

Abstract

The present invention discloses a method for demodulation in Multi-user Reusing One Slot operation and a system thereof, belonging to the field of mobile communication. The method comprises the following steps: obtaining a first signal-interference-noise ratio according to a strong signal of a channel which has a greater impulse response on wireless channels; reconstructing the strong signal; subtracting the signal which is obtained by reconstructing the strong signal from the resultant signal received on the wireless channels to obtain a weak signal; obtaining a second signal-interference-noise ratio according to the weak signal; determining whether the second signal-interference-noise ratio is greater than a first iteration threshold; reconstructing the weak signal and updating the first iteration threshold to be the second signal-interference-noise ratio if the second signal-interference-noise ratio is greater than a first iteration threshold; otherwise, ending; obtaining a strong signal according to the signal obtained by reconstructing the weak signal; and reconstructing the obtained strong signal again. According to the invention, demodulation performance of uplinks of communication system can be improved significantly.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a demodulation method and system under the application of multiple users multiplexing the same time slot. Background technique [0002] The GSM system is a TDMA (Time Division Multiplexing) and FDMA (Frequency Division Multiplexing) system. Currently, for the existing GSM system, one channel can only carry one FR (full rate) voice service, or The two sub-channels carry 2 channels of HR (half rate) voice services. It should be pointed out that for these 2 channels of HR voice, the Um (wireless interface) port does not transmit and receive at the same time in one time slot of one frequency point , that is, voice transmission on two sub-channels of the same channel is still realized by time division. Multi-user Reusing One Slot (MUROS, Multi-user Reusing One Slot) application technology is the evolution technology of the GSM system for CS services (circuit domain switching servi...

AI Technical Summary

Problems solved by technology

Therefore, under the MUROS application of the GSM network, for the uplink, there will always be two Gaussian filtered minimum shift keying (GMSK, Gaussian filtered Minimum Shiftkeying) modulated signals transmitted simultaneously on one time slot at one frequency point, so that Will cause mutual interference between these two signals

The way of the existing technology is to use the traditional MLSE (Maximum-Likelihood Sequence Estimator) demodulation technology for uplink demodulation. Since the two signals are subject to relatively strong co-channel interference from each other, the performance of the traditional demodulation is relatively poor and cannot meet the requirements. The needs of practical demodulation application of GSM system

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