System and method for single to two-band personal communication service base station conversion

• US 6,064,665 A
• Filed: 10/22/1997
• Issued: 05/16/2000
• Est. Priority Date: 10/22/1997
• Status: Expired due to Term

• Current Assignee: Qwest Communications International Incorporated (Lumen Technologies, Inc.)
• Original Assignee: MediaOne Group Inc. (Comcast Corporation), U S West Inc.
• Inventors: Gilbert, Charles G., Leuck, Wayne A., Lerman, Ruvin I.
• Primary Examiner(s): Jung, Min
• Assistant Examiner(s): Santiago, Enrique L
• Application Number:
  US08/955,546
• Time in Patent Office: 937 Days
• Field of Search: 370/200, 370/318, 370/320, 370/335, 370/334, 370/342, 370/343, 370/355, 370/375, 370/465, 370/481, 370/482, 370/486, 370/487, 370/491, 370/496, 375/200, 375/206, 375/260, 375/347, 455/45, 455/102, 455/118, 455/131, 455/150, 455/205, 455/207, 455/208, 455/209, 455/230, 455/255, 455/258, 455/303, 455/304, 455/313, 455/314, 455/315, 455/318, 455/323
• US Class Current: 370/335
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

CDMA (Code Division Multiple Access) communications systems and methods for performing a single to multiple frequency band conversion for mobile communications. The systems and methods include mixing a portion of a first CDMA signal in a first frequency band with a reference signal to convert a portion of the first CDMA signal to a second frequency band. The converted portion and the other portion of the first frequency band can then be transmitted. The systems and methods further include filtering a portion of a second CDMA signal having frequency components in multiple frequency bands to provide a filtered CDMA signal in the first frequency band. The filtered CDMA signal is then mixed to convert it to the second frequency band for receiver processing.

Claims

1. A CDMA (Code Division Multiple Access) communications apparatus for converting a CDMA signal in a single frequency band to two frequency bands for transmission, the apparatus comprising:

a signal splitter for splitting a CDMA signal into a first CDMA signal and a second CDMA signal, wherein the first and the second CDMA signals are in a first frequency band;

a mixer for mixing only the first CDMA signal with a reference signal having a predetermined frequency to convert the first CDMA signal from the first frequency band to a second frequency band; and

an antenna operable with the signal splitter and the mixer for transmitting the first CDMA signal in the second frequency band and the second CDMA signal in the first frequency band.

2. The apparatus of claim 1 further comprising:

a local oscillator operable with the mixer for providing the reference signal.

3. The apparatus of claim 1 further comprising:

a duplexer interposed the mixer and the signal splitter and the antenna.

4. A CDMA (Code Division Multiple Access) communications apparatus for converting a received CDMA signal having frequency components in two frequency bands to a single frequency band, the apparatus comprising:

a first filtering circuit for passing only frequency components of a received CDMA signal within first and second frequency bands to provide a filtered two frequency band CDMA signal;

a signal splitter for splitting the filtered two frequency band CDMA signal into a first CDMA signal and a second CDMA signal;

a second filtering circuit for passing only frequency components of the first CDMA signal within the first frequency band to provide a first frequency band CDMA signal;

a mixer for mixing the first frequency band CDMA signal with a reference signal having a predetermined frequency to convert the first frequency band CDMA signal from the first frequency band to the second frequency band to provide a second frequency band CDMA signal;

a power combiner operable with the mixer and the power splitter for combining the second frequency band CDMA signal from the mixer with the second CDMA signal from the power splitter to provide a combined CDMA signal having frequency components in the first and second frequency bands; and

a third filtering circuit for passing only frequency components of the combined CDMA signal within the second frequency band to provide a combined second frequency band CDMA signal.

5. The apparatus of claim 4 further comprising:

a local oscillator operable with the mixer for providing the reference signal.

6. The apparatus of claim 4 further comprising:

an antenna for providing the received CDMA signal to the first filtering circuit.

7. A CDMA (Code Division Multiple Access) communications method for converting a CDMA signal in a single frequency band to two frequency bands for transmission, the method comprising:

splitting a CDMA signal into a first CDMA signal and a second CDMA signal, wherein the first and the second CDMA signals are in a first frequency band;

mixing only the first CDMA signal with a reference signal having a predetermined frequency to convert the first CDMA signal from the first frequency band to a second frequency band; and

transmitting the first CDMA signal in the second frequency band and the second CDMA signal in the first frequency band.

8. A CDMA (Code Division Multiple Access) communications method for converting a received CDMA signal having frequency components in at least two frequency bands to a single frequency band, the method comprising:

passing only frequency components of a received CDMA signal within first and second frequency bands to provide a filtered two frequency band CDMA signal;

splitting the filtered two frequency band CDMA signal into a first CDMA signal and a second CDMA signal;

passing only frequency components of the first CDMA signal within the first frequency band to provide a first frequency band CDMA signal;

mixing the first frequency band CDMA signal with a reference signal having a predetermined frequency to convert the first frequency band CDMA signal from the first frequency band to the second frequency band to provide a second frequency band CDMA signal;

combining the second frequency band CDMA signal with the second CDMA signal to provide a combined CDMA signal having frequency components in the first and second frequency bands; and

passing only frequency components of the combined CDMA signal within the second frequency band to provide a combined second frequency band CDMA signal.