As　an　enhanced　version　of　Walsh-code-based　multiaccess　differential　chaos　shift　keying　(DCSK-WC),　the　differentially　DCSK-WC　(DDCSK-WC)　benefits　from　better　error　performance　and　stronger　robustness　against　inter-symbol　interference　in　multipath　fading　channels.　In　this　paper,　the　Bahl-Cocke-Jelinek-Raviv　(BCJR)　decoding　algorithm　is　applied　in　the　detection　of　DDCSK-WC　to　form　DDCSK-WC-BCJR.　Theoretical　analyses　and　simulation　results　demonstrate　that　the　BCJR　detector　achieves　a　significant　performance　gain　with　respect　to　the　conventional　generalized-maximum-likelihood　detector,　while　retaining　the　hardware　complexity　almost　unchanged.　To　further　improve　the　performance,　protograph-based　low-density-paritycheck　channel　codes　are　incorporated　into　the　DDCSK-WC-BCJR　system　so　as　to　construct　a　serial　concatenated　coding　scheme.　However,　the　capacity-approaching　protograph　code　in　additive　white　Gaussian　noise　(AWGN)　channels　performs　poorly　in　the　DDCSK-WC-BCJR　system　over　multipath　fading　channels.　To　tackle　this　problem,　a　new　protograph　code　is　designed　with　the　help　of　a　modified　extrinsic　information　transfer　analysis.　The　proposed　code　has　decoding　thresholds　gap　within　1.0　dB　way　from　to　the　system　capacity　limits.　Besides,　the　performance　superiority　of　the　protograph-coded　DDCSK-WC-BCJR　architecture　is　illustrated　over　a　practical　UWB　channel.　More　importantly,　the　proposed　scheme　does　not　require　channel　state　information　as　in　uncoded-DCSK　schemes,　which　makes　it　extremely　promising　for　low-cost　and　low-complexity　wireless　communication　applications.　©　2017　IEEE.