Multi-path tracking method and device

Abstract

The invention discloses a multi-path tracking method and device. The method comprises the steps of searching the positions of multiple paths and expanding a certain number of paths in front of and behind the positions of the multiple paths, acquiring the signal to interference ratio of each expanded path and selecting paths needing to be combined according to the signal to interference ratio of each path, carrying out maximal-ratio combining on the symbol level data of the selected paths needing to be combined, and taking the positions of the selected paths needing to be combined as the multi-path tracking positions. According to the multi-path tracking method and device, the problem that multiple path position searching carried out according to correlation technique is high in error is solved, multiple path position searching accuracy is higher, the block error rate of large transmission blocks is reduced, the peak rate of uplink transmission is increased, and extra gain of multiple path combination is obtained.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a multipath tracking method and device. Background technique [0002] In code division multiple access systems, Rake (Rake) receivers are widely used. The multipath searcher is an important part of the Rake receiver, which is responsible for multipath search and allocation. After the Rake receiver searches the multipaths, it performs descrambling and despreading on the searched multipaths, and finally performs maximum ratio combining on the above multipaths. Whether the location of the searched multipath is accurate determines the performance of the receiver. With the further increase of the data transmission rate, higher requirements are placed on the accuracy of the searcher. When the transmission block is very large, the error rate of received data may reach 100% if the multipath position deviates only from the distance of 1 / 8 chip. [0003] In related technologies, a ma...

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Problems solved by technology

Moreover, due to clock problems such as crystal oscillators, it is inevitable that the real multipath position of the mobile station will move within the update period of the searcher, and the movement of the mobile station will also cause the jitter of the multipath position

However, due to the error of multipath search and the rapid jitter of multipath position, the deviation of multipath position will be caused. The jitter of the multi-path position due to the movement of the mobile station and the movement of the mobile station is inevitable. If the matched filtering method in the related art is used to search for the multi-path position, the search accuracy is not high and the algorithm complexity is high, which is not suitable for fast multi-path Path position update, resulting in deviation of multipath position

[0004] For the problem of high multipath position error found in related technologies, no effective solution has been proposed so far

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