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Spreading code construction for CDMA
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DOI：10.1109/LCOMM.2002.807433.png)
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摘要
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In this letter, we use the well-known Walsh-Hadamard codes to construct larger sets of linearly dependent codes such that their matrix of correlations is band-diagonal. Optimal detection for systems employing these spreading codes can be efficiently accomplished by a trellis decoder. Analysis and simulation show that with a processing gain of N, up to 2N users can be accommodated without much performance degradation. This proposed approach is quite general and larger code set can be constructed analogously.
Keyword:
cross-correlation
synchronous CDMA
trellis decoding
Walsh-Hadamard codes
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4.4
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