Frequency for multiplexing method of No.3 sector in orthogonal frequency division multiplexing wireless cellular network

Abstract

There are three communication ways between mobile station and base station that are used in cellular phone network. In normal condition, user only connects to one directional antenna and adopts point to point operation. When user is at edge of sector or at the area where the signals are weak, the mobile station can communicates with 2-3 directional antennas simultaneously. Up stream link adopts frequency diversity and antenna diversity to implement multidrop operation. The down stream link uses frequency diversity and antenna diversity to implement two points to one point or three points to one point operation.

Description

technical field [0001] The invention relates to a method in the technical field of wireless communication, in particular to a frequency multiplexing method in a three-sector OFDM wireless cellular network. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology can well resist the Inter-Symbol Interference (ISI) caused by frequency selective fading and make full use of spectrum resources. Frequency reuse is a core concept of a cellular mobile communication system, which means that users in cells separated by a certain distance can use the same frequency band, thereby improving spectrum efficiency. In a cellular communication network using an omnidirectional antenna, the antenna sends signals in all directions. When a multiplexing method with a frequency reuse factor of 1 is used, that is, all cells use the same frequency band, a cell will receive signals from all six Therefore, the signal-to-carrier-to-interference ratio will become extrem...

AI Technical Summary

Problems solved by technology

The present invention adopts the mode of coexistence of multiple antenna modes, and on the basis of not greatly increasing the network frequency reuse factor, it solves the problem

Images