A device and method for reducing peak mean ratio

Abstract

The invention discloses a method for reducing peak-to-average ratio, which comprises the steps: (a) determining off-peak kernel sequence: kernel(i), i is an element of a set [1, N] by utilizing a tone preservation algorithm according to the position information of reserved subcarrier; (b) determining power peak value val in current off-peak sequence to be processed and determining the testing value beta(i) according to beta(i) = val- target*const*Theta< j*Theta(val) >, wherein, the target refers to target power value of off-peak, the constant refers to the step size of off-peak, Theta(val) refers to phase angle corresponding to the power peak value val; (c) carrying out cyclic shift to the off-peak kernel sequence: kernel(i) to obtain an iteration off-peak kernel sequence: kernel'(i); and (d) determining result sequence of off-peak process: data' (i). By adopting the method and the device disclosed by the invention, peak-to-average ratio in OFDM system can be effectively reduced.

Description

technical field [0001] The invention relates to a device and method for reducing peak-to-average power ratio (referred to as peak-to-average power ratio, PAPR), and belongs to the field of communication technology. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier transmission technology. In recent years, this technology has been widely used in wireless communication, such as Digital Video Broadcasting-Terrestrial (DVB) -T), digital audio broadcasting (Digital Audio Broadcasting, DAB), indoor wireless network (IEEE802.11a / g, HIPERLAN / 2) and broadband wireless access (IEEE802.16), etc. In the research of Beyond 3G (B3G) mobile communication, OFDM is also considered as a very promising key technology. [0003] The OFDM system distributes high-speed data streams to N parallel sub-channels through serial-to-parallel conversion, and the data of N sub-channels is modulated to mutually orthogonal sub-carriers and transmit...

AI Technical Summary

Problems solved by technology

However, the spectral characteristics of the OFDM signal will change after being limited, resulting in an increase in out-of-band power radiation and interference between subcarriers, which will reduce the bit error rate performance of the entire system;

[0007] (2) Coding: The advantage of this method is that the system is relatively simple, and the performance of reducing the peak-to-average ratio is relatively stable; however, as the number of sub-channels increases, the system throughput The traffic drops rapidly, and the frequency band utilization rate is low;

However, both of these two methods require multiple IFFT operations, and the operation complexity is high, which is not suitable for real-time processing;

[0009] (4) Tone preservation: In the US Patent No. 6,512,797, the invention name is "PRAK TO AVERAGEPOWER RATIO REDUCTION", a method of using the tone preservation algorithm for peak-to-average ratio processing is proposed, but this method needs to lose part of the data subcarriers , making the transfer rate lower

And the patent does not involve the realization process of peak-to-average ratio real-time processing

Images