Novel frequency domain equalization association part parallel disturbance eliminating and receiving method

Abstract

The invention discloses a novel reception method of frequency-domain equalization combined with partial parallel interference elimination in a code division multi-address (CDMA) mobile communication system. The reception method is that a frequency-domain equalization based on the overlapping shearing method is firstly adopted to replace a Rake receiver to make an initial estimation to the data information of each user, and then partial interference elimination is made to the users at each iterated order of interference elimination according to the order of the energies of the users from strong to weak. To improve the reliability of the detection of each iterated order, the invention uses data hard decision values of the users with stronger energy which are detected by the current order to reconstruct a multi-address interference (MAI) of the users with weaker energy in the current order, which ensures that the detection reliability of data information of the users with weaker energy in the current order is improved, thus the MAI used to reconstruct strong users in the next iterated order of the inference elimination is more reliable, thereby the reliability of the detection of each iterated order can be constantly improved.

Description

technical field [0001] The invention relates to frequency domain equalization and interference elimination technology of a Code Division Multiple Access (CDMA) mobile communication system. Background technique [0002] The continuous development of mobile multimedia services requires future mobile communication systems to provide higher data transmission rates. However, for such high-speed data transmission, the wireless channel will have stronger frequency selectivity, which will lead to serious inter-chip interference (Inter-chip Interference, ICI) and multiple access interference (Multiple Access interference) in the CDMA system. Interference, MAI). In order to eliminate the above two types of interference, the receiving schemes commonly used in practice can be roughly divided into two categories: one is Rake receiver joint interference cancellation, and the other is equalized joint interference cancellation. However, when the frequency selectivity of the wireless chann...

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Problems solved by technology

However, when the frequency selectivity of the wireless channel is strong or the system load is large, the performance of the Rake receiver is severely deteriorated, resulting in the BER platform effect of the reception algorithm such as the joint interference cancellation of the Rake receiver. This is because the interference cancellation algorithm The performance of is closely related to the accuracy of the initial stage symbol estimation. If the initial stage symbol estimation is inaccurate, the interference cancellation algorithm will not be able to obtain the desired effect, but will also lead to error diffusion

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