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Multiple-access hybrid OFDM-CDMA system

US8948705B2 · US · B2

Patent metadata
FieldValue
Publication numberUS-8948705-B2
Application numberUS-201113227946-A
CountryUS
Kind codeB2
Filing dateSep 8, 2011
Priority dateOct 18, 2001
Publication dateFeb 3, 2015
Grant dateFeb 3, 2015

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  1. Title

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  2. Abstract

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  3. Assignees and inventors

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  4. Key dates

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  5. First independent claim

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  6. CPC / IPC classifications

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  7. Citations and related patents

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Abstract

Official abstract text for this publication.

In one aspect of a multiple-access OFDM-CDMA system, data spreading is performed in the frequency domain by spreading each data stream with a respective spreading code selected from a set of available spreading codes. To support multiple access, system resources may be allocated and de-allocated to users (e.g., spreading codes may be assigned to users as needed, and transmit power may be allocated to users). Variable rate data for each user may be supported via a combination of spreading adjustment and transmit power scaling. Interference control techniques are also provided to improve system performance via power control of the downlink and/or uplink transmissions to achieve the desired level of performance while minimizing interference. A pilot may be transmitted by each transmitter unit to assist the receiver units perform acquisition, timing synchronization, carrier recovery, handoff, channel estimation, coherent data demodulation, and so on.

First claim

Opening claim text (preview).

What is claimed is: 1. A method for wireless communication, comprising: spreading a modulation symbol with a spreading sequence to obtain a plurality of spread symbols; transforming the plurality of spread symbols from frequency domain to time domain based on an inverse fast Fourier transform (IFFT) to obtain a plurality of time-domain samples; and sending the plurality of time-domain samples via one or more antennas. 2. The method of claim 1 , wherein t…

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Frequently asked questions

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What does patent US8948705B2 cover?
In one aspect of a multiple-access OFDM-CDMA system, data spreading is performed in the frequency domain by spreading each data stream with a respective spreading code selected from a set of available spreading codes. To support multiple access, system resources may be allocated and de-allocated to users (e.g., spreading codes may be assigned to users as needed, and transmit power may be alloca…
Who is the assignee on this patent?
Walton Jay R, Ketchum John W, Howard Steven J, and 2 more
What technology area does this patent fall under?
Primary CPC classification H04W52/12. Mapped technology areas include Electricity.
When was this patent published?
Publication date Tue Feb 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
What related patents are in patentsdb?
We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).