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Fast slewing pseudorandom noise sequence generator and executing method thereof

A pseudo-random noise, fast technology, applied in the field of communication, can solve problems such as unhelpful communication

Inactive Publication Date: 2005-07-13
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most cases it will be advantageous to minimize the time required for finger shifting as there is no benefit to communication during finger shifting

Method used

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  • Fast slewing pseudorandom noise sequence generator and executing method thereof
  • Fast slewing pseudorandom noise sequence generator and executing method thereof
  • Fast slewing pseudorandom noise sequence generator and executing method thereof

Examples

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Embodiment Construction

[0049] Figure 5 A block diagram showing the configuration of the present invention. LFSR 520, counter 530, and shift control 540 represent functions relevant to the present invention that will occur in the generation of PN in a pair of fingers, a searcher, or a combined finger / searcher. For a comprehensive description of the invention, it is not necessary to describe the entire finger element or searcher. In the following discussion, reference is made to finger elements only, but it will be clear to those skilled in the art that the PN generation and shifting techniques are applicable to both finger elements and searchers. In an exemplary embodiment, the above units are connected with DSP500. For ease of description and without loss of generality, only a single finger unit is shown, but actually several finger elements are connected to the DSP500. In the exemplary embodiment there will be 4 finger elements. In the exemplary embodiment, the DSP 500 is used in conjunction wi...

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PUM

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Abstract

A novel and improved method and apparatus for a fast-slewing pseudorandom noise sequence generator is described. One or more loadable PN generators are controlled by a DSP or microprocessor in conjunction with a free-running counter which maintains a reference offset count. The PN generator will typically be part of a finger or searcher. The DSP or microprocessor may assist in other finger or searcher functions as well as the slew function, and can control one or more fingers and / or searchers. Each PN generator is comprised of a loadable linear feedback shift register (LFSR) or its equivalent, a loadable counter for maintaining an index of the state of that particular PN generator, and a slew control device capable of receiving a slew command and controlling the LFSR and index counter to enact an advance or a retard of a certain offset distance.

Description

technical field [0001] The present invention relates to communications and, more particularly, to a novel and improved method and apparatus for generating pseudorandom noise (PN) sequences with the capability of rapidly shifting from one bias to another. Background technique [0002] Pseudorandom noise (PN) sequences are more commonly used in the air interface such as the IS-95 standard and its derivative standards such as IS-95-A and ANSI J-STD-008 issued by the Telecommunications Industry Association (TIA). The direct sequence spread spectrum communication system described in the standard (hereinafter collectively referred to as the IS-95 standard) and is primarily used in cellular telecommunications systems. The IS-95 standard combines Code Division Multiple Access (CDMA) signal modulation techniques to perform multiple communications simultaneously on the same RF bandwidth. When combined with inclusive power control, multiple communications on the same bandwidth, by inc...

Claims

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Application Information

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IPC IPC(8): G06F7/58H03K3/84H04J13/00H04B7/26H04B1/707H04J13/10
CPCG06F7/582H04J13/0022H04J13/10H04J13/0074H04B1/70756G06F7/584
Inventor 周群真G·C·西A·阿格拉沃
Owner QUALCOMM INC
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