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Low complexity multiuser detector and method for generating de-spread sequence for user in CDMA reciever system

A detector and multi-user technology, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve problems such as the complexity of MUD detectors

Inactive Publication Date: 2010-12-08
D S P C TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MMSE-based MUD detectors have traditionally been considered too complex for implementation in e.g. cellular communication systems

Method used

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  • Low complexity multiuser detector and method for generating de-spread sequence for user in CDMA reciever system
  • Low complexity multiuser detector and method for generating de-spread sequence for user in CDMA reciever system
  • Low complexity multiuser detector and method for generating de-spread sequence for user in CDMA reciever system

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Embodiment Construction

[0011] In the following detailed description, reference is made to the accompanying drawings, in which are shown, by way of illustration, specific embodiments in which the invention may be practiced. These examples are described in detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the invention, although different, are not necessarily mutually exclusive. For example, a particular function, structure or characteristic described in connection with one embodiment herein may be implemented in other embodiments without departing from the spirit and scope of the invention. In addition, it should be understood that the location or arrangement of elements within each disclosed embodiment may be modified without departing from the spirit and scope of the invention. Therefore, the following detailed description is not limitative, and the scope of the present invention is defined only by the appended claims duly ...

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Abstract

A multi-user detector for use in a CDMA receiver system includes a channel tap interpolator to generate interpolated channel taps for users of interest. The interpolated channel taps occur at integer multiples of a chip period from a sampling reference point. The channel tap interpolation allows detection processing to proceed in the chip domain, rather than in the sample domain, thus reducing the complexity of the multi-user solution significantly. In at least one approach, a number of low dimensionality 'virtual' users are defined based on the recursive property of the spreading sequences. Solutions may then be developed for the virtual users using conventional detection (e.g., MMSE) techniques.

Description

technical field [0001] The present invention relates to wireless communication systems, and some embodiments relate to code division multiple access (CDMA) receivers implementing multiuser detection (MUD). Background technique [0002] An increasingly popular multiple access technique in communication systems is Code Division Multiple Access (CDMA). In a direct-sequence (DS) CDMA system, multiple substantially orthogonal codes (usually in the form of pseudorandom noise sequences) are used to spread-spectrum modulate the user signals in the system. Each modulated user signal has an overlapping frequency spectrum with other modulated user signals in the system. However, since the basic modulation codes are substantially orthogonal, each user signal can be demodulated independently by performing a correlation operation using the corresponding codes. [0003] For various reasons, the codes in the modulated user signals received in a CDMA-based receiver may not be perfectly ort...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04L25/02H04B1/7105
CPCH04B1/71055H04L25/0232
Inventor D·耶林K·皮克Y·佩雷特斯
Owner D S P C TECH