Title :
A multiuser receiver for trellis-coded DS/CDMA systems in asynchronous channels
Author :
Kim, Kwang Soon ; Song, Iickho ; Kim, Hong Gil ; Kim, Yun Hee ; Kim, Sun Yong
Author_Institution :
Radio & Broadcasting Tech. Lab., Electron. & Telecommun. Res. Inst., Daejeon, South Korea
fDate :
5/1/2000 12:00:00 AM
Abstract :
We propose and analyze a multiuser receiver using a decorrelating filter and Viterbi decoders for trellis-coded direct-sequence code-division multiple-access (DS/CDMA) systems with biorthogonal signal constellation in asynchronous channels. The biorthogonality is implemented by user signature waveforms and the decorrelating filter. The performance of the proposed system is investigated with emphasis on the asymptotic cases: it is shown that the proposed system provides us with some coding gain and near-far resistance. It is confirmed that we can enhance the performance of the proposed system by using base-station antenna arrays
Keywords :
Viterbi decoding; antenna arrays; code division multiple access; decorrelation; encoding; filtering theory; land mobile radio; multiuser channels; radio receivers; spread spectrum communication; trellis coded modulation; TCM; Viterbi decoders; asymptotic performance; asynchronous channels; base-station antenna arrays; biorthogonal signal constellation; coding gain; decorrelating filter; direct-sequence code-division multiple-access; mobile communications; multiuser receiver; near-far resistance; performance; trellis-coded DS/CDMA systems; trellis-coded modulation; user signature waveforms; Antenna arrays; Constellation diagram; Decoding; Decorrelation; Filters; Immune system; Multiaccess communication; Performance gain; Signal analysis; Viterbi algorithm;
Journal_Title :
Vehicular Technology, IEEE Transactions on
