Method for reducing peak-to-average power ratio in mobile communication system and device thereof

Abstract

The embodiment of the invention discloses a method for reducing peak-to-average power ratio in a time division-synchronous code division multiple access (TD-SCDMA) system, which comprises the following steps: for each carrier wave, respectively storing Phi k, wherein the Phi k includes a certain amount of nonlinear phase rotation factors Phi k, and the number of Phi ks at least equals to the number of users which can be carried by the carrier waves corresponding to the Phi ks, each Phi k has a nonlinear relation mutually; before user data are overlaid in the carrier waves, selecting one Phi k for each user data from Phi ks corresponding to the carrier waves; rotating the phases of the user data and the rotation angle corresponding to the size of the selected Phi k. The embodiment of the invention simultaneously discloses a device for reducing peak-to-average power ratio in the TD-SCDMA system; the device consists of a Phi k storing unit, a Phi k selecting unit and a Phi k rotating unit. With the adoption of the technical proposal disclosed by the embodiment, peak-to-average power ratio of signals can be reduced significantly, simultaneously the operand of an algorithm can be reduced and the complexity of the algorithm can be lowered.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a method and device for reducing signal peak-to-average ratio (Peak to Average Power Ratio, PAR) in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system. Background technique [0002] The multi-carrier multi-user application in the mobile communication system means that there are multiple carriers in the same cell to carry user data transmission, and each carrier can carry data transmission of multiple mobile users. The multi-carriers are divided into primary carriers and secondary carriers, wherein only the primary carrier has a common control channel, and each secondary carrier has its own dedicated control channel. When a single antenna is used to transmit multi-carrier and multi-user data, the multi-carrier data is superimposed before being sent by the transmitter. [0003] The Time Division Synchronous Code Division Multiple Access (TD-SCDM...

AI Technical Summary

Problems solved by technology

[0018] It can be seen that although the multi-carrier unified phase rotation method can effectively reduce the power of the Midamble code part in the multi-carrier data, thereby reducing the PAR of the signal, and has a lower calculation amount, but if the multi-carrier unified coding method is used, then in Before sending user data in each time slot, each carrier needs to know the number of users with user data in other carriers in the system, so as to obtain the index of the user in the carrier, and select the phase rotation factor according to the user index, which requires each in the system Carriers communicate with each other, and inter-carrier communication will increase the difficulty of system control

Moreover, in hardware implementation, different carriers are often arranged on different hardware boards, and inter-carrier communication requires communication between hardware boards. The communication between the various internal carriers will increase the difficulty of system control and hardware implementation

[0019] It can be seen from the above analysis that when the problem of signal PAR is too high after multi-carrier and multi-user data is superimposed in the prior art, either the amount of calculation is too large, or the control is too complicated, which makes the system difficult to implement

Images