System and method for embedding OFDM in CDMA systems
First Claim
Patent Images
1. A transmitter adapted to transmit a downlink signal comprising:
- at least one code separated CDMA (code division multiple access) channel(s) that are scrambled with a common scrambling code;
an OFDM packet channel overlaid over the CMDA channels, the OFDM packet channel being divided into OFDM slots during which OFDM signals are transmitted with capacity allocated on a per OFDM slot basis, the OFDM packet channel not being scrambled by the common scrambling code.
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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.
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Citations
58 Claims
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1. A transmitter adapted to transmit a downlink signal comprising:
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at least one code separated CDMA (code division multiple access) channel(s) that are scrambled with a common scrambling code;
an OFDM packet channel overlaid over the CMDA channels, the OFDM packet channel being divided into OFDM slots during which OFDM signals are transmitted with capacity allocated on a per OFDM slot basis, the OFDM packet channel not being scrambled by the common scrambling code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A receiver comprising:
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an A/D converter adapted to produce a sequence of samples of received signal;
CDMA demodulator for performing CDMA demodulation upon the sequence of samples;
OFDM demodulator for performing OFDM demodulation upon the sequence of samples. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A method comprising:
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generating at least one code separated CDMA (code division multiple access) channel(s) that are scrambled with a common scrambling code;
generating an OFDM packet channel, the OFDM packet channel being divided into OFDM slots during which OFDM signals are transmitted with capacity allocated on a per OFDM slot basis, the OFDM packet channel not being scrambled by the common scrambling code;
combining the code separated CDMA channel(s) and the OFDM channel into a combined signal and transmitting the combined signal. - View Dependent Claims (54, 55, 56, 57, 58)
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Specification