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Receivers with chip-level decision feedback equalizer for CDMA downlink channels
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- Authors
- Jinho Choi, Seong Rag Kim, Cheng-Chew Lim
- Issue Date
- 2004-01
- Citation
- IEEE Transactions on Wireless Communications, v.3, no.1, pp.300-314
- ISSN
- 1536-1276
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- For the code division multiple access (CDMA) downlink channel, we investigate the decision feedback equalizer (DFE) at chip-level to effectively suppress multiple-access interference (MAI) when the spreading sequences are orthogonal. The structure of the receiver with the chip-level DFE has been investigated and the minimum mean-square error solution has been derived. Due to the inherent structure of the chip-level DFE, some iterative techniques with hard and soft decisions have been proposed. It is shown that the proposed receivers with the chip-level DFE can provide satisfactory performance. In comparison with the adaptive chip-level linear equalizer, the number of users can be doubled by using adaptive chip-level DFE at a bit-error rate of 10 -3. Throughout the paper, we assume that scrambled orthogonal codes are used for spreading sequences.
- KSP Keywords
- Bit-error-rate(BER), Code division Multiple Access(CDMA), Iterative technique, Minimum Mean Square Error(MMSE), Multiple access interference(MAI), Number of users, Orthogonal code, Soft-decision, decision feedback equalizer, linear equalizer(LE), mean square error(MSE)