Direct-sequence CDMA method and device

Details Direct-sequence CDMA method and device Direct-sequence CDMA method and device

2006-09-19

2006-09-19

Pham, Chi (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S320000, C370S335000, C375S229000, C375S144000

Reexamination Certificate

active

07110352

ABSTRACT:
In code division multiple access communications wherein a plurality of data streams carrying a plurality of transmit symbols are spread by a plurality of assigned spread code, the data streams are divided into a plurality of data blocks and a plurality of prefixes in symbol-level are added to the data blocks prior to the data streams being spread and combined for transmission. At the receive side, the prefixes are removed from the received data stream in the time domain and the prefix-removed data stream is converted into a transformed signal in the frequency domain. A feed-forward filter is used to implement a joint equalization and despreading operation by element-by-element multiplications in frequency domain. A feedback filter is used to remove the inter-symbol interference and update the feed-forward filter through a feedback loop.

REFERENCES:
patent: 6188717 (2001-02-01), Kaiser et al.
patent: 6842487 (2005-01-01), Larsson
IEEE Communications Magazine 0163-6804/97; S. Hara et al.; “Overview of Multicarrier CDMA”; pp. 126-133; Dec. 1997.
IEEE Transactions on Communications, vol. 50, No. 6, 0090-6778/02; N. Benvenuto et al.; “On the Comparison Between OFDM and Single Carrier Modulation with a DFE Using a Frequency-Domain Feedforward Filter”; pp. 947-955; Jun. 2002.
D. Falconer et al.; “White Paper: Frequency Domain Equalization for Single-Carrier Broadband Wireless Systems”; pp. 1-24; Feb. 15, 2002.
IEEE 0-7803-7484-3/02; F. Vook et al.; “Cyclic-Prefix CDMA with Antenna Diversity”; pp. 1002-1006; 2002.
IEEE 0-7803-7377-4/02; K. Baum et al.; “Cyclic-Prefix CDMA: An Improved Transmission Method for Broadband DS-CDMA Cellular Systems”; 2002.
IEICE Trans. Commun., vol. E84-B, No. 3; S. Abeta et al.; “Performance of Coherent Multi-Carrier/DS-CDMA and MC-CDMA for Broadband Packet Wireless Access”; pp. 406-414; Mar. 3, 2001.

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