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Data detection for codes with non-uniform spreading factors

A spreading factor and spreading code technology, applied in the field of wireless code division multiple access communication systems

Inactive Publication Date: 2009-09-02
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At least two communication signals have different spreading factors

Method used

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  • Data detection for codes with non-uniform spreading factors
  • Data detection for codes with non-uniform spreading factors
  • Data detection for codes with non-uniform spreading factors

Examples

Experimental program
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Embodiment Construction

[0016] Embodiments of the present invention can be used in substantially any code division multiple access communication system, such as time division duplex / code division multiple access, time division multiple access / code division multiple access or frequency division duplex / code division multiple access Take communication systems and other types of communication systems.

[0017] figure 1 It is an embodiment of a non-uniform spreading factor communication system. transmitter 20 and receiver 22 are shown in the figure 1 . The transmitter 20 can be placed in the UE, or the multiple transmission circuits can be placed in the base station. Although a preferred use of the receiver 22 is at a base station to receive uplink communications, the receiver 22 can be located at the UE or the base station or both.

[0018] The data symbols to be transmitted to the receiver 22 are processed by the modulation and spreading device 24 at the transmitter 20 . Modulation and spreading de...

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Abstract

A plurality of communication signals is received. Each communication signal has an associated code. At least two of the communication signals has a different spreading factor. The associated codes have a scrambling code period. A total system response matrix has blocks. Each block has one dimension of a length M and another dimension of a length based on in part M and the spreading factor of each communication. M is based on the scrambling code period. Data of the received plurality of communication signals is received using the constructed system response matrix.

Description

technical field [0001] The present invention relates to a wireless code division multiple access communication system. In particular, the invention relates to data detection for communications with non-uniform spreading factors in the system. Background technique [0002] In a Code Division Multiple Access (CDMA) communication system, multiple communications can share the frequency spectrum and be transmitted simultaneously. Each communication is identified by the code used to transmit the communication. Communication data symbols are expanded using code chips. The number of chips used to transmit a particular symbol is called the spreading factor. For illustration, for a spreading factor of 16, 16 chips are used to transmit a symbol. Typical spreading factors (SF) are 16, 8, 4, 2 and 1 in TDD / CDMA communication systems. [0003] In some CDMA communication systems it is preferred to use a shared spectrum, which is time divided into blocks having a predetermined number o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/69H04W88/02H04W88/08
CPCH04B2201/70703H04B1/71052H04B1/71055H04J13/0044H04B2201/70705H04B1/707H04B1/7103
Inventor 金永録潘俊霖艾利拉·莱尔亚历山大·瑞茨尼克
Owner INTERDIGITAL TECH CORP