Transmission method of the universal mobile communication system and its system

Abstract

The present invention relating to the mobile communication filed discloses a transmitting method and system in the universal mobile communication system to improve the multipath interference resisting ability of the MIMO downlink physics channel on the premise of having the compatibility of UMTS system. In the present invention, each branch signals of the MIMO downlink physics channel at the network side compose the single-carrier symbols with cyclic prefix; then the symbols are sent to the UE side through the emitting antennas corresponding to the branches after being combined with the signals of other physics channel; UE processes the signals of the downlink physics channel using MIMO that has been received by the antenna in a frequency domain multi-user detecting mode, while a common CDMA receiving method is retained to other downlink physics channel.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to the transmission technology in the universal mobile communication system. Background technique [0002] The 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as "3GPP"), as an important organization in the field of mobile communications, has promoted the standardization of the 3rd Generation Mobile Communications (The Third Generation, referred to as "3G") technology. Its early protocol Both uplink and downlink services in this version are carried on dedicated channels. [0003] With the development of mobile communication technology, 3G technology is also constantly evolving. In order to further improve the performance of all aspects of Universal Mobile Telecommunications System (UMTS) in 3G, High Speed ​​Downlink Packet Access (High Speed ​​Downlink Packet Access, HSDPA for short) and High Speed ​​Uplink Packet Access (HSDPA) are introduced...

AI Technical Summary

Problems solved by technology

Since the M×L multipath components are not completely orthogonal and there is mutual interference, when the MIMO order is high, the factor of multipath interference increases significantly compared with the single-antenna system, which makes subsequent multi-user detectors difficult Effectively distinguish the signal flow of each spatial multiplexing

In fact, MIMO is usually mixed with high-order modulation (16QAM / 64QAM), so the adverse effects of multipath interference are more significant

[0022] In actual application, the above scheme has the following problems: the current HSPA system is difficult to support wireless technologies with high spectral efficiency such as MIMO, so it is difficult to achieve the proposed "Close to or meet the spectral efficiency, peak rate and delay performance of the LTE system within the 5MHz bandwidth" and "smooth evolution to the LTE system as much as possible" and other requirements

Even so, the performance that can be achieved with complex receiver techniques such as multipath interference cancellation is limited, especially when using high-order MIMO such as MIMO with 4 or more transmit and receive antennas, and the combination of MIMO and high-order modulation When used, the performance achievable with complex receiver techniques such as multipath interference cancellation is extremely limited

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