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Receiver and its symbol decoding method

A technology of receivers and symbols, applied in the field of receivers, can solve problems such as unrealizable and complex Viterbi decoders

Active Publication Date: 2014-10-01
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, those skilled in the art readily understand that a Viterbi decoder is too complex to be implemented unless the number of trellis states can be reduced to 4 or 8, which is also known as a "truncated" Viterbi decoder

Method used

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  • Receiver and its symbol decoding method
  • Receiver and its symbol decoding method

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Embodiment Construction

[0085] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore The scope of protection of the present invention should be defined by the claims.

[0086] Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0087] image 3 is a block diagram of a communication system 30 according to an embodiment of the present invention. Please refer to image 3 , the communication system 30 may particularly include a frequency discriminator 400 and a joint symbol decoder (Joint symbol decoder, JSD) 402 at the receiver side. Furthermore, the communi...

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Abstract

The invention provides a receiver which can decode a current symbol based on information of at least one previous symbol, the current symbol and at least one subsequent symbol in a Gaussian frequency shift keying communication system. The receiver comprises a frequency discriminator, a first look-up table which is used for storing a plurality of bit modes, a plurality of mode indexes and mapping modes, a calculator which is used for receiving a group of continuous symbols from the frequency discriminator and calculating distance values between the continuous symbols and each one of the mapping modes, a comparator which is used for identifying the mapping mode having the minimum distance value in the mapping modes by comparing the distance values from the calculator, and a storage module which is used for outputting a middle bit in the bit modes stored in the first look-up table (LUT).

Description

technical field [0001] The present invention relates to a receiver in a communication system, and more particularly to a receiver capable of decoding a current symbol in a wireless communication system based on information of previous, current and subsequent symbols. Background technique [0002] In a wireless communication system, Inter-symbol-interference (ISI) is caused by multipath transmission and / or filtering. Transmitter filtering will generally be required to reduce or minimize out-of-band spurious signal emissions. Furthermore, receiver filtering may be required to reject adjacent band interference and receiver noise. Since multipath transmissions are common in wireless channels, ISI effects need to be mitigated at the receiver. [0003] In summary, a bitwise decoder can decode one symbol at a time while ignoring ISI effects. A decision-feedback (DF) decoder can decode the current symbol at the symbol rate by using the decisions of the previous symbol (or multipl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/06H04L27/10
Inventor 彭蔚中陈政宏金判燮
Owner MICROCHIP TECH INC
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