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Method for improving demodulation correctness

A technology of accuracy rate and frequency point, which is applied in the field of improving demodulation accuracy rate, can solve problems such as peak-to-average ratio, achieve the effect of reducing peak-to-average ratio and improving accuracy rate

Active Publication Date: 2014-06-04
POTEVIO INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before IFFT transformation, multiple frequency points will generate the same frequency domain signal (f 1 , f 1 ... f N ), then after IFFT, filter filtering, and modulation to their respective carrier frequencies, when signals of multiple carrier frequencies are superimposed, if the phases of multiple signals are consistent, the instantaneous power of the superimposed signal obtained will be much higher than The average power of the signal, which can cause high peak-to-average ratio (PAPR) problems

Method used

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  • Method for improving demodulation correctness
  • Method for improving demodulation correctness
  • Method for improving demodulation correctness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The initial value of the pseudo-random sequence of each frequency point is calculated by the following formula:

[0052] c init = 2866 × ( 2 * SubBandIndex + 1 ) × 2 9 + N ID cell .

[0053] Among them, SubBandIndex represents the frequency point index value, Represents the cell ID.

[0054] The initial value of the scrambling code is 31-bit in total, including a 22-bit mixer and a 9-bit cell ID. The 22-bit mixer is composed of the following formula:

[0055] 22-bit mixer=2866×(2*SubBandIndex+1).

[0056] The above formula can be applied to downlink control channels of wireless communication systems with carrier aggregation features, including: PCFICH, physical HARQ indicator channel (P...

Embodiment 2

[0082] The initial value of the pseudo-random sequence of each frequency point is calculated by the following formula:

[0083] c init = ( n SI - RNTI + 1 ) × ( mod ( SubBandIndex , 128 ) + 1 ) × 2 9 + N ID cell .

[0084] Among them, n SI-RNTI The wireless network temporary identification number updated for system information, for all users of the same frequency point, this value is the same, SubBandIndex represents the frequency point index value, Represents the cell ID.

[0085] The ini...

Embodiment 3

[0098] The initial value of the pseudo-random sequence of each frequency point is calculated by the following formula:

[0099] c init = ( n RNTI + 1 ) × 2 16 + mod ( SubBandIndex , 128 ) × 2 9 + N ID cell . Among them, n RNTI is the wireless network temporary identification number, SubBandIndex represents the frequency point index value, Represents the cell ID.

[0100] The initial value of the scrambling code is 31-bit, including 15-bit n RNTI , 7-bit frequency point index value SubBandIndex, 9-bit cell ID.

[0101] The above formula can be applied to the downlink service c...

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Abstract

Disclosed is a method for improving demodulation correctness. The method comprises: encoding downlink channel information, and obtaining encoded data; then according to a district ID and a frequency point index, calculating the initial value of each frequency point pseudo random sequence; in a downlink channel, according to the initial values, calculating scrambling code sequences corresponding to the frequency points, and scrambling the encoded data through the scrambling code sequences; and a receiving end descrambling received data by use of the scrambling code sequences. By applying the embodiments of the invention, different scrambling code sequences are generated for different frequency points, the peak-to-average ratio can be reduced, and the correctness of data demodulation by a receiving end is further improved.

Description

technical field [0001] The present application relates to the technical field of communications, and more specifically, to a method for improving demodulation accuracy. Background technique [0002] The digital transmission system uses the scrambling code to be transparent to various digital information, that is, to randomize the binary digital information, so that the signal spectrum is dispersed and kept constant. In the 3GPP Long Term Evolution (LTE) system, a scrambling code is designed for each physical channel, and the characteristics of the scrambling code are used to reduce the mutual interference of signals between cells. [0003] Take the Downlink Control Format Indicator Channel (PCFICH) as an example. On each subframe, the number of Orthogonal Frequency Division Multiplexing (OFDM) occupied by the Physical Downlink Control Channel (PDCCH) on the subframe is indicated by a Control Format Indicator (CFI). According to Table 5.3.4-1 of the 3GPP protocol version 36...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 王丽冯绍鹏雷旭王单
Owner POTEVIO INFORMATION TECH
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