Sub-symbol parallel interference canceling

A technology of interference cancellation and sub-symbols, applied in the field of multiple access interference cancellation, can solve the problems of implementation, deficiency, complexity and impossibility of traditional technology discovery, etc.

Inactive Publication Date: 2006-06-14
米特罗公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Each of the conventional techniques was found to be either too complex to be implemented in

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  • Sub-symbol parallel interference canceling
  • Sub-symbol parallel interference canceling
  • Sub-symbol parallel interference canceling

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Embodiment Construction

[0033] In the following description, for purposes of explanation, numerous details are presented, including specific formulae, in order to provide an understanding of one or more embodiments of the invention. It will be apparent, however, to one skilled in the art that certain specific details are not necessary to practice the present invention. For example, the details of one aspect of the invention are not necessary to practice another aspect of the invention. To simplify the description, the specification is divided into separate sections related to various aspects of the invention.

[0034] As indicated above, each aspect of the present invention can be embodied in a variety of forms, including computer-implemented methods, computer program products, communication systems and networks, receivers, transmitters and transceivers, and the like. For example, in one embodiment, a handheld device, such as a cellular telephone, includes conventional memory, and a processing unit ...

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Abstract

In an asynchronous CDMA communication system using long codes, multiple access interference can be reduced. In one aspect, Parallel Interference Cancellation (PIC) performs decoupled estimation, preferably non-linear and applied to chip spacing. According to another aspect, interference is canceled using a technique that estimates bits in a symbol by interpolating a user's signature waveform into a common sampling grid of received data. According to another aspect, multi-stage, hybrid multi-stage and reconfigurable recursive multi-stage multi-user detection structures and corresponding processing may be provided.

Description

[0001] Cross References to Related Applications [0002] This application claims benefit pursuant to 35USC 119(e) of Provisional Application 60 / 443,655, filed January 30, 2003, entitled "Multi-User Detection Techniques for CDMA." technical field [0003] The present invention relates generally to communications, and more particularly to improving communication system performance by canceling interference, and more particularly to improving cancellation of multiple access interference in code division multiple access communication environments. Background technique [0004] Code Division Multiple Access ("CDMA") provides an efficient communication technique for sharing a communication channel among several users. Unfortunately, when the channel is overcrowded, conventional CDMA receivers work poorly and multiple access interference (MAI) severely degrades performance. Although a maximum likelihood receiver is easy to describe in this context, it is nearly impossible to imple...

Claims

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Application Information

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IPC IPC(8): H04B1/7107
Inventor 詹姆斯·P·敦亚克约翰·D·菲特杰尔姆·M·夏皮罗
Owner 米特罗公司
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