8.5.3.2Cell gains and phases

The cr,s,k values are normalized modulation values of the constellation point z according to the modulation alphabet

used for the SDC (16or 4-QAM for robustness modes A, B, C and D and 4-QAM for robustness mode E, see figures 29 and 30).

Successive constellation points are assigned to the SDC cells of a transmission super frame in order of increasing carrier index k, starting from the most negative k; then in time order starting from the first SDC bearing symbol of the super frame.

8.6Data cells

8.6.1Cell positions

Data cells are all cells which are neither pilot cells, nor control cells; for which kmin ≤ k ≤ kmax and k does not belong to the subset of unused carriers defined above.

8.6.2Cell gains and phases

The cr,s,k values are the normalized modulation values of the constellation point z according to the modulation alphabet used for the MSC (64-QAM or 16-QAM for robustness modes A, B, C and D and 16-QAM or 4-QAM for robustness mode E, see figures 26 to 30) taken from the vector Sm (see clause 7.7).

Successive elements sm,i are assigned to the cells of a transmission super frame in order of increasing carrier index k, starting from the most negative k; then in time order starting from the first non-SDC symbol of the super frame.

ETSI

Annex A (informative):

Simulated system performance

This annex provides simulated system performance anticipating perfect channel estimation, ideal synchronization and the absence of phase noise and quantization effects. The signal power includes pilots and the guard interval. Channel decoding is assumed to be done with single stage Viterbi decoding for 4-QAM modulation and with a multistage decoder with two iterations for 64-QAM modulation.

The results in table A.1 are given for five of the channels of clause B.1, whereby the associated robustness modes are A for channels 1 and 2, and B for channels 3 to 5. The associated code rate is R = 0,6 and the modulation is 64-QAM.

Table A.1: Required S/N for a transmission to achieve a BER = 1 × 10-4 after the channel decoder for the MSC(Mode A/B)

Further results for other combinations of DRM transmission and service parameters (including real channel estimation behaviour of the receiver) can be found in Recommendation ITU-R BS.1615 [9].

The results in table A.2 are given for six of the channels of clause B.2, whereby the associated robustness mode is E. The code rate is R=0,33 and the modulation is 4-QAM.

Table A.2: Required C/N for a transmission to achieve a BER = 1 × 10-4 after the channel decoder for the MSC (Mode E)

The results in table A.3 are given for six of the channels of clause B.2, whereby the associated robustness mode is E. The code rate is R=0,5 and the modulation is 16-QAM.

Table A.3: Required C/N for a transmission to achieve a BER = 1 × 10-4 after the channel decoder for the MSC (Mode E)

ETSI