US6363103.pdf (1003.75 kB)
Multistage interference cancellation for CDMA applications using M-ary orthogonal moduation
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posted on 2016-06-07, 00:00 authored by R. Michael Buehrer, Sridhar Gollamudi, Steven P. NicolosoA multistage or parallel interference canceler (PIC) arrangement is disclosed for use in a communications system using code division multiple access (CDMA) with M-ary orthogonal modulation. All the M symbol waveforms, weighted according to their correlations with a despread signal, are combined to form a reconstructed symbol waveform for each user in each stage. The reconstructed symbol waveforms for all users are summed to form an estimated composite received signal having reduced interference which is subtracted from the composite received signal to generate a residual interference signal (RIS). While the total received signal is despread in the first stage of the PIC, the RIS or cancellation residue signal from the immediately preceding stage is used in succeeding stages of the PIC. A final decision is made by despreading the RIS from the final stage of the PIC, correlating it with the M symbol waveforms using an FHT. A weight vector from the final stage is then added to the output of the FHT. The real part or the squared magnitude of the resulting correlations, depending, respectively, on whether coherent or noncoherent demodulation is used, is then taken. The final symbol decision is made by selecting the symbol corresponding to the maximum component resulting decision statistic vector.
History
Patent Number
US 6363103 B2Other Application
09/058,065Inventor
R. Michael Buehrer Sridhar Gollamudi Steven P. NicolosoInventor from Local Institution
Sridhar GollamudiAssignee
Lucent Technologies Inc. (Murray Hill, NJ)Date Modified
2017-08-01Language
- English
Claims
19Publisher
United States Patent and Trademark OfficeCooperative Patent Classification Codes
H04B 1/71072 (20130101)Contributor
Sridhar GollamudiInternational Patent Classification Codes
H04L 27/30 (20060101); H04L 27/26 (20060101); H04L 027/30 ()US Patent Classification Codes
375/148;Usage metrics
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