UNIFIED MMSE EQUALIZATION AND MULTI-USER DETECTION APPROACH FOR USE IN A CDMA SYSTEM
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Abstract
A unified minimum mean square error (MMSE) equalization/multi-user detection (MUD) approach for demodulating direct sequence CDMA (DS-CDMA) signals is described. In at least one embodiment, the unified approach is capable of generating a variety of cost-effective receiver demodulation techniques that may range from, for example, a low cost linear MMSE equalization technique to a relatively high complexity MMSE MUD.
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Citations
37 Claims
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1. (canceled)
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2. An apparatus comprising:
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a despreader to despread data within a baseband code division multiple access (CDMA) signal, said data being associated with a desired user; and a despreading sequence generator to generate a joint equalization/multi-user detection (MUD) despreading sequence for use by said despreader to despread said data. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for use in connection with a code division multiple access (CDMA) receiver, comprising:
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assigning individual active users to either a first group or a second group, and generating a joint minimum mean square error (MMSE) equalization and multi-user detection (MUD) despreading sequence based on a distribution of active users within said first and second groups; processing a received CDMA signal using said joint MMSE equalization and MUD despreading sequence including performing MMSE MUD processing when said first group includes all active users and said second group includes no users. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. An article comprising a storage medium having instructions stored thereon that, when executed by a computing platform, result in:
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assigning, within a code division multiple access (CDMA) receiver, individual active users to either a first group or a second group; and generating a joint minimum mean square error (MMSE) equalization and multi-user detection (MUD) despreading sequence based on a distribution of active users within said first and second groups. - View Dependent Claims (26, 27)
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28. A system comprising:
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multiple receive antennas to receive a code division multiple access (CDMA) signal from a wireless channel; a despreader to despread data within a baseband version of said CDMA signal, said data being associated with a desired user; and a despreading sequence generator to generate a joint equalization/multi-user detection (MUD) despreading sequence for use by said despreader to despread said data. - View Dependent Claims (29, 30, 31, 32)
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33. A method comprising:
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receiving a code division multiple access (CDMA) signal from a wireless channel; and detecting user data within said CDMA signal, wherein detecting user data includes processing said CDMA signal using a combination of minimum mean square error (MMSE) equalization and MMSE multi-user detection (MUD) techniques. - View Dependent Claims (34, 35, 36, 37)
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Specification