Code division multiple access and time division multiple access single-frequency point sharing device

A technology of time division multiple access and code division multiple access, applied in the field of mobile communication, can solve the problem that EV-DV and HSDPA cannot provide high-speed data application requirements for multiple users, and achieve the effect of improving spectrum utilization and improving technical defects

Inactive Publication Date: 2008-02-27
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
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Problems solved by technology

According to the maximum downlink capacity formula of the CDMA system cell derived by the applicant, it can be basically judged that the application requirements that EV-DV and HSDPA should provide high-speed data to multiple users cannot be realized by using the existing basic principles of CDMA

Method used

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  • Code division multiple access and time division multiple access single-frequency point sharing device
  • Code division multiple access and time division multiple access single-frequency point sharing device
  • Code division multiple access and time division multiple access single-frequency point sharing device

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Embodiment Construction

[0019]The present invention can be used to increase the downlink capacity of the existing FDD CDMA mobile communication system. The basic feature of this equipment is to use cdma20001x and 1x EV-DO technology simultaneously on one frequency point of the cell, but will allocate Two short PN sequences originally used for different cell address codes are used as channel address codes in CDMA or TDMA mode. Apparently, a dedicated frequency point is no longer assigned to the 1x EV-DO system. That is to say, only one frequency point is still used in a cell, and the high-speed data user channel of TDMA and the voice or low-speed data user channel of CDMA each use a short PN sequence address code. The easiest-to-implement interference canceller must be used in the receiver of voice or low-speed data users, which is only used to eliminate the self-interference generated by a TDMA high-speed data channel; in order to improve the service quality of high-speed data users, it is also neces...

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Abstract

A shared device of CDMA and TDMA single frequency point is prepared as series-connecting output end of base band signal processor in data circuit of each path voice, scrambler, address code circuit, gain regulator, adder, the first multiplexing scramble code circuit, etc in sequence; series-connecting high speed data user signal D via 1xEV-Do base band processor, series / parallel converter, pulse amplitude modulation converter, etc in sequence; connecting output of orthogonal amplitude modulation circuit to antennal and connecting output end of radio frequency processor to disturbance set- off and user data demodulator.

Description

technical field [0001] The invention relates to a mobile communication device, in particular to a CDMA / TDMA mobile communication device which utilizes an interference canceller to realize single-carrier code division multiple access 2000 and data-dedicated channel same-frequency point compatibility, and belongs to mobile communication technology field. Background technique [0002] As far as the applicant knows, both CDMA20001x EV-DV and HSDPA technologies are CDMA / TDMA dual-purpose technologies, and the basic methods they use are to implement time division multiple access on the basis of downlink code division multiple access. The 1x EV-DV system will use the remaining Walsh address code resources for voice communication to form two TDMA channels for wireless access of high-speed data signals; HSDPA designates a code division multiple access channel for multi-user TDMA high-speed transmission of data. Although these two schemes have provided the realization form of CKMA / T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/00H04J13/00H04J14/08H04Q7/30H04B7/26
Inventor 傅海阳金卓琳张亚琪张青钱月清
Owner NANJING UNIV OF POSTS & TELECOMM
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