Device enabling different spreading factors while preserving a common rambling code, in particular for transmission in a code division multiple access cellular mobile radio system
View Patent ↗A device which enables different spreading factors while preserving a comnmon scrambling code, in particular for transmission in a code division multiple access cellular mobile radio system. The device including a grouper for grouping the various data symbols of a kth incoming sequence (k= 1 , . . . , K) into different blocks of Q MAX /Q K symbols, and a spreader for spreading K incoming sequences with K respective spreading codes of respective length Q k (k= 1 , . . . , K) which is a sub-multiple of a maximum length Q MAX , wherein the spreader spreads the blocks from the kth incoming sequence (k= 1 , . . . , K) with the corresponding code of length Q k to obtain a spread sequence including different spread blocks of length Q MAX . The device further includes a scrambler for scrambling each of the K spread sequences obtained in this way using a scrambling code of length Q MAX .
1. A transmission device enabling different spreading factors while preserving a common scrambling code for transmission in a code division multiple access cellular mobile radio system, the device comprising:
spreading means for spreading blocks of symbols with the different spreading factors; and
scrambling means for applying a scrambling code of length Q MAX which is a multiple of said different spreading factors, to blocks of Q MAX basic symbols obtained by spreading with any of said spreading factors.
2. A transmission device enabling different spreading factors while preserving a common scrambling code for transmission in a code division multiple access cellular mobile radio system, the transmission device spreading K incoming sequences by means of K respective spreading codes of respective length Q k (k=1, . . . , K) which is a sub-multiple of a maximum length Q MAX , and scrambling the spread sequences obtained in this way, the transmission device comprising:
grouping means for grouping data symbols of a kth incoming sequence (k=1, . . . , K) into different blocks of Q MAX /Q k symbols; and
spreading means for spreading the different blocks from the kth incoming sequence (k=1, . . . , K) by means of the corresponding spreading code of length Q k to obtain a spread sequence including different spread blocks of length Q MAX ,
scrambling means for scrambling each of the K spread sequences generated by the spreading means by applying a scrambling code of length Q MAX which is a multiple of the spreading codes.
3. A reception device enabling different spreading factors while preserving a common scrambling code for transmission in a code division multiple access cellular mobile radio system, the device comprising:
descrambling means for applying a scrambling code of length Q MAX which is a multiple of said different spreading factors, to spread blocks of Q MAX basic symbols obtained by spreading with any of said spreading factors; and
despreading means for despreading with said spreading factors said blocks of Q MAX basic symbols descrambled by said descrambling means.
4. A reception device enabling different spreading factors while preserving a common scrambling code for transmission in a code division multiple access cellular mobile radio system, the reception device descrambling and despreading an incoming sequence by means of K respective spreading codes of respective length Q k (k=1, . . . , K) which is a sub-multiple of a maximum length Q MAX the reception device comprising:
descrambling means for descrambling said incoming sequence of spread blocks of Q MAX basic symbols obtained by spreading with the spreading codes using a scrambling code of length Q MAX which is a multiple of the spreading codes;
grouping means for grouping basic symbols of the spread and descrambled sequence in different spread blocks of length Q MAX ; and
despreader means for despreading the spread blocks with the K respective spreading codes to obtain K despread sequences formed of different blocks of Q MAX /Q K symbols (k=1, . . . K).
5. A mobile station for a mobile radiocommunication system, comprising a device according to claim 1 .
6. A base transceiver station for a mobile radiocommunication system, comprising a device according to claim 1 .
7. A mobile station for a mobile radiocommunication system, comprising a device according to claim 2 .
8. A base transceiver station for a mobile radiocommunication system, comprising a device according to claim 2 .
9. A mobile station for a mobile radiocommunication system, comprising a device according to claim 4 .
10. A base transceiver station for a mobile radiocommunication system, comprising a device according to claim 4 .