Interference signal eliminating module in GSM (global system for mobile communication) and implementation method thereof
A GSM system and interference signal technology, applied in the field of single-antenna interference elimination technology, can solve the problems of asynchronous propagation delay, frame synchronization of interference bursts, etc., and achieve the effect of reducing the number of grid states and reducing the complexity of the algorithm
Active Publication Date: 2013-04-17
RDA TECH
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[0007] Second, it is necessary to know the training sequence of the interference signal. In the case where the information of the interference signal cannot be known in advance, an additional training sequence recognition algorithm is required to detect the interference signal
[0008] The third is that the burst pulse sequence frame synchronization of the interference signal and the desired signal is also required
This requires the associated GSM base stations to be fully synchronized, which is often not possible
And even in the case of synchronous GSM base stations, the different propagation delays of the desired signal and the interfering signal will lead to an asynchronous situation
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[0028] The technology involved in this application is applicable to the base station and mobile terminal of the GSM communication network.
[0029] see figure 1 , which is an ordinary burst (NB) data structure. Encrypted bits (Encrypted bits) are 58 bits in length, usually encrypted customer data or voice, which contains 1 bit as a borrowing sign. The borrow flag indicates whether the burst is borrowed by FACCH (Fast Associated Control Channel) signaling. The length of the training sequence (Training Sequence) is 26 bits, which is a string of known data. The length of the tail bit (TB) is 3 bits, always 000, which helps the SAIC equalizer to judge the start bit and stop bit. The guard interval (GP) is 8.25 bits in length and has no useful data.
[0030] figure 2 A channel model with co-channel interference is shown, which exemplarily represents 3 base stations 201, 202 and 203, and a SAIC equalizer 200 in a mobile terminal. The SAIC equalizer 200 includes an analog fron...
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The invention discloses an interference signal eliminating module in a GSM (global system for mobile communication). An SAIC (single antenna interference cancellation) equalizer comprises an analog front end, a joint detection module and a joint channel estimation module, wherein received signals are transmitted to the joint channel estimation module and the joint detection module by the analog front end. Desired signals and interference signals in the received signals are computed by the joint channel estimation module and are transmitted to the joint detection module. The interference signals in the received signals are eliminated by the joint detection module according to an MLSE (maximum-likelihood sequence estimation) algorithm or a JMLSE (joint maximum-likelihood sequence estimation) algorithm, and the desired signals are output. The invention also discloses an implementation method of the interference signal eliminating module, and the JMLSE algorithm or the MLSE algorithm is adopted according to whether the interference signals exist or not. Under the condition of not losing performances, the algorithm complexity is reduced; the invention also provides a training sequence identifying algorithm of the interference signals, so that the training sequence, the time offset and the channel parameters used by the interference signals can be accurately estimated; and the situation that the desired signals and the interference signals are different in propagation time delay can also be adapted.
Description
technical field [0001] The present application relates to a single antenna interference cancellation technology (SAIC, Single antenna interference cancellation) in a GSM communication system. Background technique [0002] In the GSM communication system, the wireless signal transmission between the base station and the receiver (that is, the mobile terminal) may be affected by thermal noise and co-channel interference, which mainly comes from adjacent base stations. In the GSM communication system, in order to increase the capacity of the system, the same frequency resources will be reused. If the cell planning is not reasonable enough, the co-channel interference will have a great impact on the signal reception of the mobile terminal. [0003] Co-channel interference is colored noise. In a traditional GSM receiver, the MLSE (Maximum Likelihood Sequence Estimation) algorithm is used to remove intersymbol interference and white noise. "Maximum-likelihood sequence estimation...
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IPC IPC(8): H04L25/03H04L25/02
Inventor 孔德琦
Owner RDA TECH