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Low-complexity GMSK receiver used for rapid variation channel and narrow bandwidth channel

A technology for receiving signals and signals, which is applied to shaping networks in transmitters/receivers, baseband system components, digital transmission systems, etc., and can solve problems such as performance degradation, not very suitable for changing channel conditions, and large phase changes

Inactive Publication Date: 2015-08-26
HUAWEI TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these equalizers are not well suited to varying channel conditions or phase noise introduced by the transmitter and receiver, and small Doppler shifts or phase changes due to phase noise can cause significant performance degradation
This is especially problematic when the GMSK symbol rate is low so that the signal can fit in a narrow bandwidth channel, since a given Doppler shift or phase noise performance will result in a larger phase change during each symbol period

Method used

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  • Low-complexity GMSK receiver used for rapid variation channel and narrow bandwidth channel
  • Low-complexity GMSK receiver used for rapid variation channel and narrow bandwidth channel
  • Low-complexity GMSK receiver used for rapid variation channel and narrow bandwidth channel

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Embodiment Construction

[0026] exist figure 1 An example of a method for decoding symbols in a received signal subject to inter-symbol interference is shown in . The method includes receiving a signal representing a plurality of symbols, with a given interval between the symbols (step 101). The symbol interval can be denoted as T s . The word "symbol" in this context is used to mean any unit of data, so each "symbol" may represent any number of one or more bits. The received signal is filtered to produce a sequence of samples (step 102). Each sample in the sequence preferably represents one of these symbols and at least the sum of symbols immediately preceding and following this symbol in the received signal. Samples can be formed from weighted sums of symbols. Combining adjacent symbols to form individual symbols reflects inter-symbol interference: each symbol is affected by those symbols on either side of it.

[0027] The sequence of samples is then multiplied by the complex sine function (st...

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Abstract

A low-complexity GMSK receiver used for a rapid variation channel and a narrow bandwidth channel is provided. A method used for decoding symbols in a receiving signal subjected to inter-symbol interference, wherein the receiving signal comprises a plurality of symbols which are spaced by symbol spaces, comprises the following steps: filtering the receiving signal to form a sample for expressing the symbols, wherein the sample comprises the sum of the symbols and symbols prior to and posterior to the symbols; multiplying the sample by a complex sine function to generate a complex number, wherein at positions of integral multiples of the symbol space, the complex sine function alternately has the following items: (i) a zero real component and a nonzero virtual component, and (ii) a nonzero real component and a zero virtual component; and decoding the symbols based on the complex number.

Description

technical field [0001] The present invention relates to methods and arrangements for decoding signals subject to inter-symbol interference. Background technique [0002] Gaussian Minimum Shift Keying (GMSK) is a continuous phase modulation scheme in which the phase of a carrier signal is varied according to the information to be transmitted. GMSK uses a premodulated Gaussian filter with narrow bandwidth and sharp cutoff. The Gaussian filter suppresses high frequency components and makes the output power spectrum more compact. Also, because GMSK uses only phase modulation, it is a constant envelope modulation scheme. GMSK is therefore an attractive modulation scheme that enables efficient low power transmitter designs and is therefore attractive for battery powered communication devices that must achieve very long battery life. [0003] Demodulating a signal generated by a continuous phase modulation scheme is complicated by the fact that the initial phase of each symbol i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/00H04B1/06
CPCH04L27/2017H04L27/2334
Inventor B·加夫尼
Owner HUAWEI TECH CO LTD