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Channel coding based on the UID channel in the PHS

A channel coding and channel technology, which is applied in the field of telephone communication, can solve problems such as poor expansion capability and low reliability of communication transmission

Inactive Publication Date: 2007-08-01
UTSTARCOM TELECOM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The present invention can not only overcome the disadvantages of PHS in the prior art, such as poor ability to expand new services and low reliability of communication transmission, but also the present invention is simple to implement, can enhance the anti-fading performance of PHS, and improve voice quality

Method used

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  • Channel coding based on the UID channel in the PHS
  • Channel coding based on the UID channel in the PHS

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Experimental program
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Embodiment Construction

[0015] PHS is a TDD (Time Division Duplex) / TDMA (Time Division Multiple Access) system, the carrier spacing used is 300KHz, and each time slot is 625μs long. Each frame of the base station is 5 milliseconds and contains 8 time slots. Among them, the first to fourth time slots are used for the downlink from the base station to the mobile phone, and the fifth to eighth time slots are used for the uplink from the mobile phone to the base station, and they together constitute four time division duplex channels. One of the channels is a control channel (CCH, Control Channel), and the other three channels are traffic channels (TCH, Traffic Channel). Traffic channels are sent every frame (5 milliseconds). The existing PHS speech coding adopts 32kbit / s ADPCM (adaptive differential pulse code modulation) mode, and its call quality is basically the same as that of a fixed telephone.

[0016] The specific channel coding process of the present invention will be described below with refe...

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Abstract

The invention provides a means of channel coding using UDI channel of PHS, it includes: coding the sound; adding the cyclic redundancy check code that is CRC code to the sound data which is after the coding; the sound coding data is convoluotinal encoding or repeat encoding [M1]; the sound data which is after the convoluotinal encoding or repeat encoding is bit slotting or filling. The invention is simple, and it increases the fading property of PHS, and increases the sound quality. Because the invention makes UDI channel possesses bearing of coding protection, so the AMR, command, VoIP can be transferred.

Description

technical field [0001] The present invention relates to telephone communication technology, in particular to related technologies of channel coding and CRC error correction mechanism on UDI (Unrestricted Digital Information, unrestricted digital information) channel in PHS (Personal Handset System, personal handheld telephone system). Background technique [0002] The physical layer of the PHS in the prior art is relatively simple. Since there is no channel coding in the PHS in the prior art, the PHS in the prior art does not support general radio interface enhancement technology. As a result, the PHS has poor anti-fading performance and poor voice quality, and it only supports data communication, but the support effect for VoIP (Voice over Internet Protocol) is not ideal. [0003] To enhance PHS performance, the existing PHS must be extended and enhanced. However, the service expansion capability of the existing PHS is limited. In order to facilitate the expansion of new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/09G10L19/00H04Q7/20
Inventor 刘晟张晶龚锦荣
Owner UTSTARCOM TELECOM CO LTD
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