Multiuser detector for variable spreading factors

A technology of users and factors, applied in multiplexing communication, code division multiplexing system, using convolutional code error correction/error detection, etc., can solve problems such as undisclosed rearrangement methods

Inactive Publication Date: 2005-08-31
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, prior art does not disclose the rearrangement method used when using different unwinding codes among multiple active users

Method used

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  • Multiuser detector for variable spreading factors
  • Multiuser detector for variable spreading factors
  • Multiuser detector for variable spreading factors

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Embodiment Construction

[0079] Embodiments will be described with reference to the drawings, wherein like numerals represent like components.

[0080] Expressed in Figure 7 is a multi-user detector 17 that detects a plurality of users transmitting in a common CDMA channel after reception. The multi-user detector 17 includes a plurality of processors with attached memory for performing various vector and matrix operations. Another embodiment includes fixed gate arrays and DSPs that perform the various processor functions. The detector 17 also includes a first input 19 for inputting a vector h (k) The individual k subchannel impulse responses are evaluated to the correct intermediate symbol interference or ISI caused by a subchannel's own symbols and multiple access interference or all reception caused by symbols from other user subchannels MAI of the data signal, a second input 21 for inputting data from all users k transmitting in discrete block times in the form of an input vector r comprising c...

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Abstract

A plurality of communication signals have differing spreading codes. Each communication has an associated code comprising chips. For each chip of each communication, a vector of that chip convolved with an impulse response is produced. For each communication, support blocks comprising the chip vectors are produced. A number of the chip vectors in a support block is based on that communication's spreading factor. A system response matrix is assembled. The system response matrix has symbol sub-matrices. Each symbol sub-matrix comprises a support block from each communication. Data of the communications is detected using the symbol response matrix.

Description

technical field [0001] The present invention generally relates to multiple access digital communication systems. More particularly, the invention relates to multi-user detector systems and methods for simultaneous reception of data from multiple users with different spreading factors. Background technique [0002] Multiple access communication systems allow multiple users to access the same communication medium to transmit or receive information. This medium may include, for example, network wires in a local area network or LAN, copper wires in traditional telephone systems, or air interfaces in wireless communication systems. [0003] A known multiple access communication system is shown in figure 1 . This communication medium is called a communication channel. Communication techniques such as Frequency Division Multiple Access, or FDMA, Time Division Multiple Access, or TDMA, Carrier Sense Multiple Access, or CSMA, Code Division Multiple Access, or CDMA, and others tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7103H04B1/707H04B7/155
CPCH04B1/7105H04B2201/70705H04B2201/70703H04B1/71052H04B1/7103H03M13/23
Inventor 金永録潘俊霖艾利拉·莱尔亚历山大·瑞茨尼克
Owner INTERDIGITAL TECH CORP
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