Signalling transmitting method and cellular system therefor

Abstract

The method includes: in first transmission time interval, the first cell base station makes upstream transmission for the first wireless scheduling resources obtained from wireless resources schedule of first frequency range, and the second cell base station neighboring the first cell makes downstream transmission with the second wireless scheduling resource of first frequency range and makes upstream transmission with the second wireless scheduling resource of the second frequency range; in the second transmission time interval, the first cell base station makes downstream transmission with the first wireless scheduling resource obtained from the wireless resource schedule of first frequency range, and the second cell base station makes upstream transmission with the second wireless scheduling resources; the first cell base station makes upstream transmission with the first wireless scheduling resource, and the second cell base station makes downstream transmission with the second scheduling resource. The invention can avoid interference between neighboring cells.

Description

technical field [0001] The present invention mainly relates to an Orthogonal Frequency Division Multiplexing (OFDM) system, in particular to a method for transmitting signals in the OFDM system and a cellular system for realizing the method. Background technique [0002] The trend of future mobile communication is to achieve a transmission speed of up to hundreds of megabits per second, which requires a broadband transmission solution, so that the bandwidth of the future mobile communication system will reach tens of megahertz or even hundreds of megahertz. Huge bandwidth requirements put forward new requirements for system applications. [0003] Since OFDM technology can simultaneously transmit multiple high-speed signals on specially calculated orthogonal frequencies, there is no need for guard bands between individual carriers, making the use of available spectrum more efficient. In addition, OFDM technology can dynamically allocate data on sub-channels, that is, to obta...

AI Technical Summary

Problems solved by technology

However, when the cell load exceeds 50%, it is no longer possible for adjacent cells to use orthogonal subcarriers to work, and the co-channel interference between cells will affect the performance of the system

When the cells are fully loaded, co-channel interference will be very serious, and frequency hopping technology has completely lost its meaning

[0013] (3) In the scheme of combining OFDM and CDMA technology, since CDMA is an interference-limited system, multi-path transmission in a mobile wireless environment will destroy the orthogonality of channelization codes, thereby causing intersymbol interference and affecting the system performance

Combining OFDM and CDMA technology, this problem still exists, resulting in a decrease in system capacity

In order to solve this problem, complex and advanced signal processing techniques must be used at the receiver, which will inevitably increase the complexity of the receiver, making the advantage of low receiver complexity in the pure OFDM system no longer exist

Images