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Delay Compensation Arrangement for Processing Symbols Received by a CDMA Receiver Using a Generic Finger Approach

IP.com Disclosure Number: IPCOM000012291D
Original Publication Date: 2003-May-25
Included in the Prior Art Database: 2003-May-25

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Siemens

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Abstract

Radio propagation in mobile channels is characterised by multiple reflections. Obstacles resulting in a so-called multipath progagation cause these reflections. A CDMA (Code Division Multiple Access) receiver can separate multipath components and combine them coherently to obtain multipath diversity. In this approach the delay compensation buffer is arranged after the descrambling, despreading and integrate units (rake fingers). The organisation and hardware realisation of the delay compensation buffer is solved by this invention in such a manner that allows the delay compensation of the multipath components with their numerous spreading factor (SF) and code configurations in a generic finger environment. The invention is the transition from a rigid allocation scheme of rake fingers and a rigid storage scheme for received symbols to a solution, which is characterized by a flexible allocation of rake fingers and such an organisation of the delay compensation buffer, that allows to handle the numerous spreading factor and code configurations an even transitions of spreading factors in a flexible, programmable manner with low hardware effort.