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Apparatus and method for detecting communications from multiple sources

A technology of channel matrix and channel gain, which is applied in the field of communication devices, can solve the problems of not being able to produce good performance of bit error rate, high complexity, and not showing results, etc.

Active Publication Date: 2008-09-17
STMICROELECTRONICS SRL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0039] Other ML approximation algorithms include reduced-set search methods that cannot yield less than 10 -4 Good performance in bit error rate (BER)
There is also an approximation method which involves high complexity and has not shown results other than Quadrature Phase Shift Keying (QPSK) clusters

Method used

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  • Apparatus and method for detecting communications from multiple sources
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Embodiment approach

[0055] According to embodiments, the detector described below is characterized by a much lower complexity (compared to conventional ML detectors and detectors with near ML performance). Moreover, the following detectors can implement techniques that produce reliable soft output matrices. In addition, the detector described below can be adapted to a highly parallel hardware architecture, which is a basic requirement for very large scale integration (VLSI) implementation and applications requiring real-time or low-latency response.

[0056] Although the following is described as being used in a communication system to detect multiple communications, the techniques described in this disclosure may be used in other or additional environments. For example, the technique described below can be applied to other physical systems if the physical system is described by a mathematical model (such as equation (1)) and requires the solution of minimization problems (such as equation (2)). This...

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Abstract

A method (200a-200b), apparatus (104), and computer program for detecting sequences of digitally modulated symbols transmitted by multiple sources (102, 102a-102t) are provided. A real-domain representation that separately treats in-phase and quadrature components of a received vector, channel gains, and a transmitted vector transmitted by the multiple sources (102, 102a-102t) is determined. The real-domain representation is processed to obtain a triangular matrix. In addition, at least one of the following is performed: (i) hard decision detection of a transmitted sequence and demapping of corresponding bits based on a reduced complexity search of a number of transmit sequences, and (ii) generation of bit soft-output values based on the reduced complexity search of the number of transmitsequences. The reduced complexity search is based on the triangular matrix.

Description

Technical field [0001] The present disclosure is generally directed to communication and computing systems, and more specifically, to devices and methods for detecting communications from multiple sources. Background technique [0002] Due to the demand for high data rate communication from multimedia services, wireless transmission through multiple antennas (by so-called MIMO (Multiple Input Multiple Output)) is currently extremely popular. Many applications are using or considering using MIMO to increase the data rate or the robustness of the communication link. These applications include next-generation wireless LAN networks (such as IEEE802.11n networks), mobile "WiMax" systems for fixed wireless access, and fourth-generation (4G) mobile terminals. [0003] MIMO detection usually involves estimating a sequence of digitally modulated symbols that are simultaneously transmitted from multiple sources, such as multiple transmitters or a single transmitter with multiple antennas. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00H04L25/03
CPCH04L25/06H04L25/03292H04L1/0054H04L25/03331H04L2025/03414H04L1/06H04L1/0052H04B7/02H04L1/02H04L25/03
Inventor M·西蒂M·P·费茨
Owner STMICROELECTRONICS SRL