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Nonlinear precoding in code-division multiple access communication system

A precoding and channel technology, applied in the field of precoding technology, can solve problems such as system complexity and intractability

Inactive Publication Date: 2007-05-30
NEC LAB AMERICA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in systems with inter-symbol interference, the complexity of such prior art systems becomes intractable, since the size of the matrix filter is proportional to the product of the frame length and the number of users (i.e. block processing)

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  • Nonlinear precoding in code-division multiple access communication system
  • Nonlinear precoding in code-division multiple access communication system
  • Nonlinear precoding in code-division multiple access communication system

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Embodiment Construction

[0013] Figure 1 illustrates a communication transmission system using a precoding structure arranged in accordance with one embodiment of the present invention. This article assumes that the system is (but is not limited to) a discrete-time synchronous Code Division Multiple Access (CDMA) system providing downlink transmissions to K receivers 101, 102...105 on a multipath channel.

[0014] As shown in Figure 1, the transmitter receives b[i]=[b 1 [i],...,b K [i]] T Denotes the downlink information flow 110, where b k [i] is the information symbol selected from the finite constellation group A of the k-th user transmitted during the i-th symbol interval. As detailed further below, the transmitter performs a symbol-by-symbol precoding operation, which generates a K×1 precoding symbol vector x[i]=ψ(b[i],...,b[ i-v+1]). The precoded symbol vector is converted to a spread spectrum signal at 150, where N represents the spreading factor and s k =[s k，1 ,...,s k，N ] T represen...

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Abstract

A precoding technique is herein disclosed for a spread-spectrum transmission system which advantageously addresses intersymbol interference along with multiuser and interchip interference.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of, and is a non-provisional application of, U.S. Provisional Application No. 60 / 710,060, filed August 22, 2005, entitled "Nonlinear Precoding for TD-SCDMA," which U.S. Provisional Application The contents of are hereby incorporated by reference. technical field [0003] The present invention relates generally to code division multiple access systems, and more particularly to precoding techniques for reducing interference in such systems. Background technique [0004] A major problem with systems using Code Division Multiple Access (CDMA) is that multipath fading introduces Multi-User Interference (MUI) and Inter-Symbol Interference (ISI). A technique used to minimize interference in direct-sequence CDMA systems is called "Multi-User Detection" (MUD), in which multiple transmitters (such as mobile units) send unrelated data streams to a single receiver (such as a base station ), wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26H04B1/7103
Inventor X·王M·马迪希安
Owner NEC LAB AMERICA
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