Spread spectrum base station notch filtering transmitted signals
First Claim
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1. A personal communications network unit comprising:
- circuitry configured to generate a spread spectrum code division multiple access (CDMA) data signal using a pseudo random chip code sequences the spread data signal encompassing a selected range of frequencies;
circuitry configured to notch filter the spread data signal at frequencies within the selected range; and
a transmitter configured to transmit the notch filtered spread data signal to a base station.
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Abstract
A base station is in a spread spectrum code division multiple access (CDMA) communication system with co-exists with a diverse system of existing users. The diverse system selectively utilizes various frequencies within a selected range of frequencies. The base station generates a plurality of spread spectrum CDMA data signals using pseudo random chip code sequences. The spread data signals encompass the selected range. The base station notch filters the spread data signals at frequencies within the selected range used by the diverse system. The notch filtered spread data signals are transmitted in CDMA cellular radio communications.
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Citations
39 Claims
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1. A personal communications network unit comprising:
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circuitry configured to generate a spread spectrum code division multiple access (CDMA) data signal using a pseudo random chip code sequences the spread data signal encompassing a selected range of frequencies; circuitry configured to notch filter the spread data signal at frequencies within the selected range; and a transmitter configured to transmit the notch filtered spread data signal to a base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A personal communications network unit comprising:
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a mixer configured to mix a data signal with a pseudo random chip code sequence to generate a spread spectrum code division multiple access (CDMA) data signal, the spread data signal encompassing a selected range of frequencies; an adaptive notch filter configured to notch filter the spread data signal at frequencies within the selected range; and an antenna configured to transmit the notch filtered spread data signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A personal communications network unit comprising:
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a modulator configured to convert a data signal into a format suitable for communicating over radio waves; a spread spectrum modulator configured to spread the converted data signal using a pseudo random code sequence; and a transmitter configured to transmit the spread data signal over a spectrum encompassing a selected range of frequencies;
whereby at data is recovered from the transmitted spread data signal by notch filtering at the frequencies within the selected range.
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20. A base station comprising:
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circuitry configured to generate a plurality of spread spectrum CDMA data signals using pseudo random chip code sequences, the spread data signals encompassing a selected range of frequencies; circuitry configured to notch filter the spread data signals at frequencies within the selected range; and circuitry configured to transmit the notch filtered spread data signals to personal communication network units. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A base station comprising:
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a plurality of mixers configured to mix data signals with pseudo random chip code sequences to generate a plurality of spread spectrum CDMA data signals, the spread data signals encompassing a selected range of frequencies; a plurality of adaptive notch filters configured to notch filter the spread data signals at frequencies within the selected range; and an antenna configured to transmit to personal communication network units the combined signal. - View Dependent Claims (30, 31)
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32. A base station comprising:
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a first plurality of mixers configured to mix data signals with pseudo random chip code sequences to generate a plurality of spread spectrum CDMA data signals; a second plurality of mixers configured to mix the spread data signals with an intermediate frequency (IF) signal as a plurality of IF spread data signals; a plurality of adaptive notch filters configured to notch filter the IF data signals; a third plurality of mixers configured to mix the filtered IF data signals with a radio frequency (RF) signal as spread RF data signals;
wherein the spread RF data signals are effectively notch filtered at frequencies within a selected range of frequencies; andan antenna configured to transmit to personal communication network units the spread RF data signals. - View Dependent Claims (33)
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34. A spread spectrum base station comprising:
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circuitry configured to generate a plurality of spread spectrum signals, the spread spectrum signals encompassing a selected frequency spectrum; circuitry configured to detect frequencies within the selected frequency spectrum by a diverse signal associated with the detected frequencies; circuitry configured to notch filter the spread spectrum signals so that a transmitted version of the spread spectrum signals is notch filtered at the detected frequencies; and circuitry configured to transmit the notch filtered spread spectrum signals. - View Dependent Claims (35, 36)
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37. A spread spectrum base station comprising:
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a plurality of mixers configured to mix data signals with codes to generate a plurality of spread spectrum signals; a sensor configured to detect frequencies within a selected frequency spectrum by a diverse signal associated with the detected frequencies; a plurality of notched filters configured to notch filter the spread spectrum signals so that a transmitted version of the spread spectrum signals is notch filtered at the detected frequencies; and an antenna configured to transmit the notch filtered spread spectrum signals. - View Dependent Claims (38, 39)
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Specification