Approximate Minimum Bit Error Rate Power Allocation Method for Mixed Carrier Systems

Abstract

The invention discloses an approximate minimum bit error rate (BER) power distribution method for a hybrid carrier system, relating to an approximate minimum BER power distribution technology for the hybrid carrier system, and aiming to improve the BER performance of the hybrid carrier system and increasing the achievable rate of the system. The method comprises the following steps: at a transmitting terminal, performing alpha-order weighted fractional Fourier transform for data on each band to obtain the data in a frequency domain; in the frequency domain, performing power distribution operations for the data obtained in step 1, performing IFFT for the distributed data, transforming the data to a time domain, and sending the data to a channel; at a receiving terminal, performing FFT for the received data, and transforming the data back to the frequency domain; performing channel equalization in the frequency domain; after equalization, performing inverse operations of power distribution in the frequency domain; and performing -alpha-order fractional Fourier transform demodulation, and outputting the data. The approximate minimum BER power distribution method disclosed by the invention is suitable for powder distribution occasions in wireless communication.

Description

technical field [0001] The present invention relates to an approximate minimum error rate power allocation technique for a hybrid carrier system. Background technique [0002] In recent years, with the rapid development of communication technology, people are not limited to voice transmission, and the rapid transmission of video resources has gradually become the goal of people. As a result, the load on the communication link is also increasing, and future wireless communication systems will need better criteria to precisely control resources. Resource allocation strategy has become the core part of wireless communication network, it includes a series of functions, such as scheduling, rate control, power control, bandwidth reservation and so on. At present, many technologies improve system performance based on channel characteristics, such as power allocation technology and bit allocation technology. [0003] The power allocation technology is a highly compatible technolog...

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Problems solved by technology

[0008] Document [4] ("An overview on resource allocation techniques for multi-user mimo systems" published by E.Castaneda, A.Silva, A.Gameiro and M.Kountouris) pointed out the relationship between different power allocation strategies of OFDM systems, in When the total power is constant, the maximum capacity strategy usually allocates more power to subcarriers with better channel conditions, while the minimum bit error rate strategy allocates more power to subcarriers with poor channel conditions, that is, There is a certain mutual exclusion between the two allocation strategies, that is, when the maximum system capacity is achieved, it often means that the BER performance deteriorates, and when the BER is optimized, the reachable rate of the system will decrease.

[0009] For a multi-carrier OFDM system, maximizing system capacity through power allocation often means deterioration of BER performance, and in order to achieve optimal BER performance, system capacity will decrease, so how to achieve system capacity and BER fairness depends on became a research topic

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