Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Apparatus for CDMA TDMA mobile communication

A mobile communication equipment, time division multiple access technology, applied in electrical components, transmission systems, etc., can solve the problems of rising power generation, large number of channels, and small data rate ratio.

Inactive Publication Date: 2008-03-05
NANJING UNIV OF POSTS & TELECOMM
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical defect of the original method is that when the code division multiple access and VSF methods are used to realize the compatibility of different user data rates, the data rate ratio between users is small, and the self-interference generated by high-speed data users is proportional to the data rate ratio between users. The channel capacity decreases rapidly, and the required transmission power increases, and the number of channels is large, making it difficult to use multi-user receivers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus for CDMA TDMA mobile communication
  • Apparatus for CDMA TDMA mobile communication
  • Apparatus for CDMA TDMA mobile communication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The invention can be used to increase the downlink capacity of the existing FDD CDMA mobile communication system, and can add a high-speed data channel with a downlink symbol rate up to 1.2288Msps on the basis of the original voice or low-speed data user capacity of the cdma20001x system. Assuming that the error correction coding rate Rc=1 / 2, the bit rate of the high-speed data channel can reach 614.4kbps.

[0030] In this embodiment, the block diagram of the base station terminal transmission circuit in FIG. 1 may be used. Mainly consists of base station signal processor 1, scrambler 2, address code circuit 3, gain adjuster 4, adder 5, complex scrambling code circuit 6, quadrature phase shift keying circuit 7, radio frequency processor 8, time division multiple Address combiner 9, time slot baseband signal processor 10, scrambler 11, address code circuit 12 and time slot gain adjuster 13. S in the picture 11 , S 12 ,...,S 1N It is the data of N voice or low-speed d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention presents a improves device with CDMA and variable spread-spectrum factor (VSF) for CDMA-TDMA communication to overcome the defect that using VSF to realize data speed compatibility for multiuser in FDD broadband CDMA or CDMA2000 standard, which comprises: a base station transmitting device with same multiplex voice or data circuit (A) of low-speed data user, a high-speed data user circuit (B), a summitor (5), a complex interference code circuit (6), and a quadrature phase-shift keying circuit (7); and a terminal receiving device comprised a RF processor (14) with output port connected to serial interference-elimination and user data demodulator (16) by quadrature phase-shift keying coherent demodulator (15). This invention can save about half emission power while reducing interference greatly and increasing system capacity.

Description

technical field [0001] This implementation method involves the theoretical basis of the third generation (3G) code division multiple access (CDMA) mobile communication standard, and will adopt the method of serial interference canceller and code division multiple access / time division multiple access (TDMA) to improve the original frequency division dual Wideband Code Division Multiple Access (FDD WCDMA) and cdma2000 standards only use CDMA and variable spreading factor to achieve multi-user multi-rate compatibility, which belongs to the field of mobile communication technology. Background technique [0002] Both the FDD-WCDMA standard and the cdma2000 standard use code division multiple access (CDMA) and variable spreading factor (VSF) methods to realize the compatibility of multi-user signals with different data rates on one carrier frequency. When the data rate required by the user increases, it can be realized by reducing the VSF. At this time, the ratio of the user rate ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B1/7097
Inventor 傅海阳凌灵金卓琳解辉黄在朝
Owner NANJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com