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Iterative soft interference cancellation and filtering for spectrally efficient high-speed transmission

An interference canceller and iterative technology, applied in the field of remote communication, can solve problems such as inefficiency and high computational complexity

Inactive Publication Date: 2008-04-16
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this scheme is not efficient when combined with error correction coding because the processing in the detector and decoder is done separately
On the other hand, although the Maximum A Posteriori Probability (MAP) algorithm is considered optimal when used jointly for the detector and decoder, the computational complexity is too high

Method used

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  • Iterative soft interference cancellation and filtering for spectrally efficient high-speed transmission
  • Iterative soft interference cancellation and filtering for spectrally efficient high-speed transmission
  • Iterative soft interference cancellation and filtering for spectrally efficient high-speed transmission

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Embodiment Construction

[0015] FIG. 1 shows a general transmitter 10 configuration. An input data bitstream 12 is first encoded by a Turbo encoder 14 and fed to a modulator 16 to generate complex baseband symbols 18 . In this embodiment, QPSK modulation using Gray mapping is employed. However, those skilled in the art will recognize that the following description can be easily extended to other modulation schemes. The QPSK symbols are randomly interleaved by a symbol interleaver 20 and subjected to series-parallel (S / P) conversion in an S / P converter 22 . The interleaver 20 is necessary in order to randomize the interference and channel experienced by the receiver. S / P converted n T symbol streams are drawn from n T The antennas 24 transmit simultaneously and share the same frequency band. When using Orthogonal Frequency Division Multiplexing (OFDM) and / or Spreading, an Inverse Fast Fourier Transform (IFFT) 26 and / or spreading is used on each symbol stream after the S / P converter. Optionally, g...

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Abstract

Canceling interference in a multi-input multi-output (MIMO) system is accomplished with a plurality of interference cancellers. Each interference canceller outputs an interference-cancelled received version of its corresponding transmitted signal. An estimate of the transmitted signals from all transmitting antennae is used in each interference canceller. Each estimate is multiplied by a channel coefficient matrix, which can be derived from the communication of known pilot symbols, and the resulting products of each estimate and the channel coefficient matrix are subtracted from the received signals, resulting in a corresponding difference. Each corresponding difference may be multiplied by a filter weight vector. The received signal is decoded based upon the resulting products If a predetermined interrupt criteria is not met, then the decoded signal is used in the preparation of the estimate for a subsequent interference cancellation iteration. The method can be iteratively performed until the predetermined interrupt criteria is met.

Description

technical field [0001] The present invention relates to the field of telecommunication, and more particularly to an iterative soft interference canceller (I-SIC) for use on the receiving side of a multiple-input multiple-output (MIMO) telecommunication system. Background technique [0002] The widespread use of the Internet has facilitated the design of more reliable, comfortable and efficient communication systems, especially in the mobile environment (due to its portability and convenience). So-called third-generation (3G) systems are being introduced to support data services of hundreds of kbps in addition to high-quality voice messaging, and are being upgraded in the 3rd Generation Partnership Project (3GPP) to high-speed downlink packet interfaces. Access (HSDPA) for discussion and standardization to provide higher bit rate services. However, even when HSDPA uses Automatic Repeat Request (ARQ) and Adaptive Modulation and Coding Scheme (AMCS), the achievable bit rate is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04J99/00H04B7/04H04J11/00H04L1/00H04L1/04
CPCH04L1/0066H04L1/005F26B11/0409F26B11/0468F26B2200/18
Inventor 伊藤匠王晓东
Owner NEC CORP