Synchronous code{division multiple{access communication with randomly chosen spreading sequences and capacity{achieving forward error correction coding is analyzed in terms of spectral eciency. Emphasis is put on the penalties to be paid by applying single user coding in conjuction with suboptimal multiuser receivers instead of optimal joint decoding which would involve complexity that is exponential in the number of users times the codewordlength. The conventional, the decorrelating and the (re{encoded) decorrelating decision{feedback detectors are analyzed in the nonasymptotic case for spherical random sequences. The re{encoded minimum mean squared error (MMSE) decision{feedback receiver achieving the same performance as joint multiuser decoding for equal power users is shown to be suboptimal if equal rates are demanded for. Index terms | multiaccess communication, decorrelation, decision feedback, information rates, spectral eciency, spherical sequences. 1
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