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Turbo coclcs have enjoyed ii great attention i n recent years.Among diffcrcnt sol't-output clccocliny algorith,rns of Turbo codes only ni~iyiiiium a posteriori ( M A P ) decoding as a n i t c r a t i \ c soft-output decoder (BCJR) allows lor cichic\.ing an xceptablc BER pcrl'ormancc at tlh/No le\'cls within only 1 d B 01' the value cori-c\ponding to the Shannon capacity. 'Phc ilrikwback of the M A P algorithm is the c~c e~z i \ c memory required.Here. we in\ estiy,itc the so-called symbol-busctl Turbo coclc\. 'rhcse codes allow for a reduced required nicmoi-> hy 70% for the BCJR method ,