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Modulation method of full rate speech in global system for mobile communications

A technology of global mobile communication and modulation method, applied in the field of full-rate speech modulation

Inactive Publication Date: 2010-02-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the frequency resources required for the deployment of more GSM equipment have increasingly become a bottleneck restricting operators from expanding voice services

Method used

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  • Modulation method of full rate speech in global system for mobile communications
  • Modulation method of full rate speech in global system for mobile communications
  • Modulation method of full rate speech in global system for mobile communications

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0021] The user's voice forms a full-rate speech coded cell after speech coding, and after the full-rate speech coded cell is modulated onto the downlink burst, it is sent through the air interface; and the core idea of ​​the present invention is: in the GSM burst In one interleaving cycle, the voice information is modulated by a high-order modulation method in the downlink, and the high-order modulation method is: 8-phase phase-shift keying (8PSK) modulation method. Since the modulation rate of 8PSK modulation is three times that of GMSK, more voice information can be carried in the same burst, and the compound interleaving method is used for 8 bursts in one interleaving cycle, so that The traditional GSM system provides more voice informa...

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Abstract

The invention discloses a modulation method of full rate speech in a global system for mobile communications, comprises the followings: high-order modulation is carried out on full rate speech code cells, each downgoing burst period carries the modulated symbols and the burst period in the interleaving period carries at least two symbols with different mobile stations. The symbols with different mobile stations at least share a burst period in the interleaving period and each symbol occupies at least a burst period. The invention can satisfy the increasing demands of the GSM speech users on the premise of not increasing equipment investment in quantity and not requiring more frequency resources.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a modulation method for full-rate voice in the global mobile communication system. Background technique [0002] In the existing Global System for Mobile Communications (GSM for short), the air interface (Um interface for short) between the mobile terminal (MS for short) and the base station subsystem (BSS for short) adopts time division Multiple access (Time Division Multiple Access referred to as TDMA) works. Each carrier is divided into multiple time slots in the time domain and occurs in a cyclic manner. Each time slot is composed of a series of burst pulses BP (Burst Period) , each burst pulse occupies 15 / 26ms (about 577us). Speech is Gaussian filtered Minimum Shift Keying (GMSK) modulated onto these bursts for transmission over the Um interface. [0003] With the rapid increase of GSM users around the world, GSM operators have to invest and deploy more GSM equipment to...

Claims

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Application Information

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IPC IPC(8): H04W88/02H04L1/00
Inventor 王欣晖
Owner ZTE CORP
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