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Soft decision processing

A decision-making, soft technology, applied in the field of soft decision processing, can solve problems such as increasing the number of soft decision bits that need to be represented

Inactive Publication Date: 2009-07-22
MSTAR SEMICON INC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the adjustment of the noise power increases the number of bits required to represent the soft decision

Method used

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Embodiment Construction

[0047] In order to fully understand the purpose, features and effects of the present invention, now through the following specific embodiments, and in conjunction with the accompanying drawings, the present invention is described in detail, as follows:

[0048] The present invention describes a receiver configuration that uses ratios between quality estimates to generate soft decisions. D soft decision values ​​for manufacturing coded blocks are generated by processing the information of K individual sub-blocks. The initial soft decision for the bits of each sub-block does not require any noise power. Each sub-block also generates a quality metric (eg, the quality metric can be an inverse function of noise power). The initial soft decision values ​​derived from the associated quality metric scales are then used to generate information that is passed to the error correction decoder. Therefore, the proposed soft decision adjustment method uses the ratio between the quality mea...

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Abstract

The invention discloses a method of producing soft decisions for a signal, wherein a model provides an expression for an LLR for the signal, the LLR expression is dependent on noise power in the signal and can be rendered in a form independent of the noise power, wherein the method comprises evaluating the noise power independent expression using values from the signal to produce soft decisions, calculating a weight expressing the noise power affecting a soft decision relative to the noise power affecting at least one other soft decision and applying the weight to its respective soft decision.

Description

technical field [0001] The present invention relates to a method for generating soft decisions on signals. Background technique [0002] In a typical wireless system (see figure 1 ), the message is modulated into a wireless carrier by a transmitter. The signal is then transmitted to the receiver through an unknown and changing environment. The ability to remove environmental effects from the signal is often critical to the performance of a receiver. [0003] The transmitter 101 transmits the message bits by appending an error-protected encoding block 102 and then passing a digital modulation block 103 which encodes the bits b n Sequence maps to multiple symbols g n . Error correction coding is a block that is usually applied to C input samples and produces D coded samples. The mapping in the digital modulation block 103 is performed according to the modulation method used. For example, in the 3GPP standard High Speed ​​Downlink Packet Access (HSPDA), both QPSK and 16Q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/06H04L1/00H03M13/45H04L1/18
CPCH03M13/45H04L25/067H04L1/1819H04L1/0054H04L1/1893H04L1/1845H04B1/707
Inventor 赛瑞尔·凡拉登卡罗·帕切蒂
Owner MSTAR SEMICON INC