A high-speed modulation method based on gpp and simd technology

Abstract

Provided is a high-speed modulation method based on GPP and SIMD technologies. The method comprises the steps that k input bit stream information streams are modulated and are output in the mode of the real part data (I path) and imaginary part data (Q path) of modulated constellation point coordinates; k is a modulation factor, and when the modulation mode is BPSK, k=1; when the modulation mode is QPSK, k=2; when the modulation mode is 22n-QAM, k=2n. Different processing modes are adopted according to the different modulation factors k, and the basic procedure comprises the steps that concurrent 'mapping' operations are carried out on bit information input by all the paths respectively, the bit information mapped by all the paths is combined together through concurrent 'plus' or 'xor' operations, and I path and Q path output is generated. Compared with a traditional table look-up modulation method, the method improves the data processing parallelism degree; meanwhile, a fixed-point number algorithm is designed for all the general modulation modes, the operation time and storage space of floating-point numbers are saved, and the calculation procedure is simplified; time complexity and space complexity are linearly increased along with the change of the modulation factors, and expansibility is achieved.

Description

technical field [0001] The invention relates to a high-speed modulation method based on a general purpose processor (GPP) and a single instruction multiple data stream SIMD (Single Instruction Multiple Data) technology, and belongs to the technical field of modulation and demodulation in wireless communication. Background technique [0002] Modulation technology is the process of processing the information of the signal source and superimposing it on the carrier to transform it into a form suitable for channel transmission. The information of the source usually contains a DC component and a lower frequency component, which is called a baseband signal. The baseband signal often cannot be used as a transmission signal, so the baseband signal must be converted into a signal with a very high frequency compared with the baseband, that is, the carrier, to be suitable for channel transmission. [0003] Modulation technology has been continuously developed along with the progress o...

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Problems solved by technology

[0019] There are two main disadvantages of the look-up table method: (1) The calculation of the array subscript and the operation of the look-up table are difficult to perform parallel calculations on the data

(2) As the modulation factor increases, the size or capacity of the table increases exponentially. This undoubtedly makes the delay of the modulation process more severe

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