Method of implementing CDMA/TDMA mobile communication by means of interference eliminator

A technology of interference canceller and time division multiple access, applied in the field of mobile communication, can solve the problems of system capacity reduction, low power utilization rate, occupying system capacity, etc.

Inactive Publication Date: 2009-08-12
NANJING UNIV OF POSTS & TELECOMM
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the data rate required by the user increases, it can be achieved by reducing the VSF. At this time, because the ratio of the user rate to the low-speed user data rate is small, the self-interference increase in the system is basically proportional to the user rate ratio. , so it will cause a large amount of system capacity to be occupied, and the required transmission power will increase
In addition, it is not easy to use high spectral efficiency modulation methods in code division multiple access systems, because the power utilization rate of such modulation methods is low, which will increase self-interference and reduce system capacity
[0003] In short, there are the following problems in using CDMA and VSF methods 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
  • Method of implementing CDMA/TDMA mobile communication by means of interference eliminator
  • Method of implementing CDMA/TDMA mobile communication by means of interference eliminator
  • Method of implementing CDMA/TDMA mobile communication by means of interference eliminator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]In this embodiment, the present invention is used to increase the downlink capacity of the existing FDD CDMA mobile communication system, and a high-speed downlink symbol rate up to 1.2288Msps can be added on the basis of the original voice or low-speed data user capacity of the cdma2000 1x system. data channel. Assuming that the error correction coding rate Rc=1 / 2, the bit rate of the high-speed data channel can reach 614.4kbps.

[0050] The base station of this embodiment is as figure 1 As shown, the upper part of the figure shows the data processing process of voice or low-speed data users in the cdma2000 1x system, and the scheme of code division multiple access is still used. The definition of low-speed data users is that the user's data rate is close to the rate of voice users, that is, 8.6 kbps. After the 8.6kbps input signal undergoes frame error detection encoding and adds the reset symbols required by the convolution or Turbo encoder, the rate rises to 9.6kbp...

Embodiment 2

[0078] When the CDMA / TDMA combination method of the present invention is used in a WCDMA system, it can overcome the technical defect that the uplink / downlink capacity of the original system is basically symmetrical and cannot meet the requirements of the mobile Internet. When used in the downlink, it can provide high-speed data channels for multiple high-speed data users on the premise of retaining the capacity of the original voice and low-speed data users, so as to meet the needs of the mobile Internet. For the uplink, the data rate required by the mobile Internet is not high and the original CDMA mode can be retained.

[0079] The base station side of the present embodiment is shown in 3, and the upper portion of this figure provides the data processing process of voice or low-speed data users in the WCDMA system, and still adopts the scheme of code division multiple access, and the definition of low-speed data users is that the data rate of the user is close to The rate o...

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

This invention relates to one method to realize code dividing multi-address and time dividing mobile communication by aid of interference eliminator, which comprises the following steps: The basic station making low speed input signals through basic signal processor, codes interference device, address code circuit, gains adjustor processor; making high speed data input signal are processed through basic band signal processor, time dividing merger, series conversion device, impulse range modulator, address codes circuit, time gap gains adjustor; then input them into adder and multi-interference circuit through modulation to send; setting receiving circuit composed of interference at user end.

Description

technical field [0001] The invention relates to a mobile communication method, in particular to a code division multiple access / time division multiple access mobile communication method using an interference canceller, and belongs to the technical field of mobile communication. Background technique [0002] At present, 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 achieved by reducing the VSF. At this time, because the ratio of the user rate to the low-speed user data rate is small, the self-interference increase in the system is basically proportional to the user rate ratio. , so it will cause a large amount of system capacity to be occupied, and the required transmission power will increase. In addition, it is not easy ...

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): H04J3/00H04J13/00H04L27/34H04J99/00
Inventor 傅海阳金卓琳张亚琪凌灵王维
Owner NANJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap