DVB-S2 - Getting Signal Constellations and Bit Mappings 1.0

Date Added: June 09, 2013 | Visits: 353

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%DVBS2Constellation Signal Constellations taken from ETSI EN 302 307% [CONSTELLATION, BITMAPPING] = DVBS2Constellation(MODSCHEME,GAMMA)% returns the constellation points and the bit mapping specified in the DVB-S2% Standard ETSI EN 302 307. The output vector CONSTELLATION contains the% constellation points and the output vector BITMAPPING contains the associated% bit mapping. The data of these vectors is organized such that the vectors% can directly fed into the sigmapper or llr_demod_mex constructor.%% The DVB-S2 Standard ETSI EN 302 307 specifies signal constellations for% four different modulation schemes: QPSK, 8PSK, 16APSK and 32APSK.%% MODSCHEME denotes the modulation scheme. GAMMA sets the constellation radius% ratios which are required when using the constellation schemes 16APSK and% 32APSK. If the modulation schemes QPSK and 8PSK are used, no additional% input GAMMA is needed.% (for more information:% http://www.etsi.org/deliver/etsi_en/302300_302399/302307/01.02.01_60/en_302307v010201p.pdf)%% Important: The radius of the inner circle of the modulation schemes 16APSK% and 32 APSK always has unit length. If the signal power should be normalized% to one, the constellations points must be scaled accordingly.%% Input: MODSCHEME [char] 'QPSK', '8PSK', '16APSK', '32APSK'% GAMMA [1x1] (16APSK), [1x2] (32APSK)%% Output: CONSTELLATION [1xM]% MAPPING [1xM]#######################################These are the basic commands lines:[constellation, bitMapping] = DVBS2Constellation('QPSK')[constellation, bitMapping] = DVBS2Constellation('8PSK')[constellation, bitMapping] = DVBS2Constellation('16APSK', [3.15])[constellation, bitMapping] = DVBS2Constellation('32APSK', [2.84 5.27])Note: There is a text file included which contains the optimum constellation radius ratios for several code rates. These radius ratios are only needed when using 16APSK or 32APSK.

Requirements: No special requirements

Platforms: Matlab

Keyword: Circle, Important, Length, Normalized, Power, Scaled

Users rating: 0/10

License: Shareware

Size: 122.88 KB

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