Method for carrying out parallel interference compensation based on control channel

Abstract

The invention discloses a parallel disturbance compensation method of controlling channel, which comprises the following steps: expanding, consolidating and sentencing receiving signal of DPCCH channel of every user by base station; getting demodulation judgement information; restructing received signal of DPCCH channel of every user according to pilot information and conciliation decision information of DPCCH channel; carrying out disturbance compensation dealing received user baseband data according to reconstructed signal.The invention needs one conciliation course and smaller resource, which reduces stand-by time lag of baseband data storage and business channel conciliation process according to reconstruct received signal of user DPCCH by time slot TPC signal.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for parallel interference cancellation based on a control channel. Background technique [0002] In wideband direct spread code division multiple access systems, such as WCDMA systems, by multiplying user data with pseudo-random bits obtained by CDMA spreading codes, the bits occupied by user information can be extended to a relatively wide bandwidth for transmission. [0003] For uplink signals, each user uses different pseudo-random bits to scramble user signals. Due to the cross-correlation of pseudo-random bits, the different pseudo-random bits are not completely orthogonal, so the signals of different users Interference between each other, this kind of interference is called multiple access interference; because the different phases of the different pseudo-random bits are not completely orthogonal, affected by the time delay of different propagation paths in the air interf...

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Problems solved by technology

[0019] 1. From the perspective of the entire signal processing process, multiple iterations of cancellation processing (generally at least 3 times) are required to obtain reliable user information, otherwise the performance of multi-user interference cancellation is poor, so the implementation of the system The complexity will increase accordingly

[0020] 2. The spreading factor information of the DPDCH channel is carried by the TFCI field information in the DPCCH channel, so it is necessary to receive at least one frame of DPCCH information to solve the spreading factor information. When performing synchronous cancellation processing on the received signal, it needs to store more There is a lot of baseband data waiting for signal reconstruction output, so the implementation cost of the system is increased; at the same time, the unified cancellation processing of the received signals in each channel means that data demodulation brings more processing delay, which is necessary for timely For the demodulation of the feedback E-DPDCH channel, it is not allowed

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