Multi-address access method, apparatus and system

Abstract

The embodiment of the invention discloses a multiple accessing and transmitting method. A modulation symbol sequence to be transmitted is divided into symbol sub-blocks, and the mapping relationships of the symbol sub-blocks, a time-frequency two-dimensional physical resource block and a fundamental physical resource block are determined; then, the symbol sub-blocks which have mapping relationship with the same time-frequency two-dimensional physical resource block are respectively processed with orthogonal transformation extension by using orthogonal extension sequences, thus obtaining symbol orthogonal transformation extension sequences of every symbol sub-block; at last, the symbol orthogonal transformation extension sequences of the symbol sub-blocks which have mapping relationship with the same time-frequency two-dimensional physical resource block are overlaid to obtain overlay signals which are mapped onto the corresponding fundamental physical resource block. The embodiment ofthe invention also discloses a transmitting device for realizing multiple accessing, a method of multiple accessing and receiving, a device of multiple accessing and receiving and a multiple accessing system. The adoption of the invention ensures that multiple accessing orthogonality of a plurality of users and diversity gain of discretized frequency can be realized, and flexibility of resource scheduling and distribution can be enhanced.

Description

Multiple access method, device and system technical field The present invention relates to mobile communication technology, in particular to a multiple access transmitting method, a multiple access receiving method, a transmitting device for realizing multiple access, a receiving device for realizing multiple access and a multiple access system. Background technique Orthogonal Frequency Division Multiplexing (OFDM) technology is one of the key technologies in future mobile communication systems. Fig. 1 shows a specific example of allocation and use of channel resources in an existing OFDM modulation mode. Referring to Figure 1, in the OFDM modulation mode, the channel resource is a time-frequency two-dimensional structure, and the basic physical resource block (PRB, PhysicalResourceBlock) is the basic unit of the channel resource, and the time-frequency two-dimensional physical resource block contains several consecutive basic Physical resource block, time-frequency two-d...

AI Technical Summary

Problems solved by technology

On the one hand, when the unit blocks of multiple users are repeatedly weighted (i.e. extended) on continuous time-frequency two-dimensional physical resources, if the sum of the subcarrier bandwidths occupied by the continuous time-frequency two-dimensional physical resources does not exceed The coherent bandwidth can be considered to be extended on a flat channel, so the difference between the actual channel response and the estimated channel response is approximately considered to be fixed, so that the orthogonality of the spreading sequence can be maintained, that is, the multi-user multiple access orthogonality The interaction is maintained; and when the unit blocks of multiple users are repeatedly weighted on the discretely distributed time-frequency two-dimensional physical resources, the difference between the actual channel response and the estimated channel response will not be constant, This will not keep the multiple access orthogonality of multiple users, thus introducing additional multi-user interference

On the other hand, when repeated weighting is performed on the unit blocks of multiple users on continuous time-frequency two-dimensional physical resources, if frequency selective scheduling is not performed, in addition to the repeatability gain, only random frequency diversity can be obtained Gain; while repeated weighting on discrete time-frequency two-dimensional physical resources, in addition to repetitive gain, discrete frequency diversity gain can also be obtained, which will exceed the frequency diversity gain of randomness

In addition, in order to realize the multiplexing of time-frequency resources, users using the same set of spreading sequences must transmit on the same time-frequency two-dimensional physical resources, which limits the flexibility of resource allocation and scheduling, especially in frequency When selective scheduling, it will limit the frequency diversity gain of multiple users

It can be seen from the above that when the existing BR-OFDMA technology repeats weighting on continuous time-frequency two-dimensional physical resources, it will obtain multi-user multi-access orthogonality, but cannot obtain discrete frequency diversity gain; while in discrete time-frequency When weighting is repeated on two-dimensional physical resources, discrete frequency diversity gain will be obtained, but the multiple access orthogonality of multiple users cannot be maintained. That is to say, the existing BR-OFDMA technology cannot simultaneously realize the multiple access orthogonality and Discrete Frequency Diversity Gain

Moreover, the flexibility of resource allocation and scheduling is poor

Images