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Reverse synchronous method in wireless system

A reverse, interference-free technology, applied in transmission systems, time division multiplexing systems, code division multiplexing systems, etc., and can solve problems such as capacity interference in CDMA systems

Inactive Publication Date: 2002-11-06
LINKAIR COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] We all know that the capacity of CDMA system is limited by interference

Method used

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  • Reverse synchronous method in wireless system
  • Reverse synchronous method in wireless system
  • Reverse synchronous method in wireless system

Examples

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Embodiment Construction

[0037] In accordance with the present invention, as realized and broadly described, there is provided a system and method for establishing and maintaining reverse synchronization of remote units where signals from remote units in the same cell arrive at base stations in the cell within a zero-correlation window . The system includes the following components:

[0038] A cellular system with multiple cells serving a geographic area;

[0039] The base stations in each cell use complementary orthogonal codes and transmit code-division multiplexed and time-division multiplexed signals to remote units;

[0040] Multiple remote units use complementary orthogonal codes and transmit spread-spectrum signals by code division multiple access and time division multiple access;

[0041] A preferred embodiment of the communication system of the present invention, such as figure 1 As shown, a cellular system including a plurality of cells serving a geographic area, a base station in each c...

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Abstract

A reverse synchronization method, which is used in a wireless system utilizing orthogonal spreading codes with Interference Free Window characteristic, wherein the transmission time of the signal from a remote unit is adjusted with respect to a predetermined Interference Free Window [-n, +n], such that the arrival time in a base station of the signal from the said remote unit falls within the said predetermined Interference Free Window. This eliminates inter-symbol interferences and multiple access interferences when multipath signals from a same remote unit and signals from different remote units arrive within an Interference Free Window.

Description

technical field [0001] The present invention generally relates to a method of establishing and maintaining reverse synchronization in mobile and wireless communication networks. Background technique [0002] In a CDMA system, each remote unit modulates the data it transmits to the base station with a spreading code unique to that remote unit. Spread spectrum, coded signals transmitted by different remote units may overlap in time and frequency. When these signals arrive at the receiving base station, the data transmitted by the remote unit is obtained by correlating the received signal with the remote unit's unique spreading code. [0003] We all know that the capacity of CDMA system is limited by interference. These interferences include intersymbol interference (ISI) between multipath signals from the same remote unit, multiple access interference (MAI) between signals from different remote units in the service area of ​​the same base station, and Adjacent cell interfer...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B7/26H04J3/06H04J13/00
CPCH04B1/7103H04B2201/709709H04J3/0682
Inventor 李道本陈卫东高海阳何绍明张永生邓元华
Owner LINKAIR COMM
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