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US 8,045,936 B2Granted
Receiver for receiving embedding OFDM in an CDMA systems
AssigneeEricsson Inc.
InventorsShiquan Wu, Wen Tong, Peiying Zhu, Ming Jia, Hua Xu, Daniel Boudreau, Jianming Wu, Mo-Han Fong, Keith R. Edwards
Life of this patent
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Abstract
Systems and methods of combining OFDM and CDMA signals are provided. An OFDM packet data channel is overlaid over CDMA transmissions. The channel is scheduled slotwise between multiple users. In some embodiments, there is a CDMA packet data channel which is scheduled together with the OFDM packet data channel.
Claims10
A receiver comprising:
- an analog-to-digital (A/D) converter for producing a sequence of samples of a received signal;
- a Code Division Multiple Access (CDMA) demodulator for performing CDMA demodulation upon the sequence of samples;
- an Orthogonal Frequency Division Multiplexing (OFDM) demodulator for performing OFDM demodulation upon the sequence of samples;
- and
- the receiver for receiving a control channel identifying for a given slot whether or not the receiver is scheduled during the slot and the receiver demodulates a given OFDM slot only if scheduled during the slot.
2 more elements
A receiver comprising:
- an analog-to-digital (A/D) converter for producing a sequence of samples of a received signal;
- a Code Division Multiple Access (CDMA) demodulator for performing CDMA demodulation upon the sequence of samples by descrambling at least one common channel, de-spread and perform soft-de-mapping and forward error correction (FEC) decoding during which the OFDM content will be substantially converted to additive white gaussian noise (AWGN);
- an Orthogonal Frequency Division Multiplexing (OFDM) demodulator for performing OFDM demodulation upon the sequence of samples by generating an interference term due to a CDMA component of the received signal, subtract the interference term from the received signal, perform OFDM demodulation on a remaining signal;
- and
- the receiver for receiving a control channel identifying for a given slot whether or not the receiver is scheduled during the slot and the receiver demodulates a given OFDM slot only if scheduled during the slot.
2 more elements
Dependencies are inferred from the claim text.