Optimizing Optical Systems Using Code Division Multiple Access and/or Orthogonal Frequency-Division Multiplexing
AssigneeFuturewei Technologies, Inc.
InventorLiming Fang
Life of this patent
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Abstract
An optical receiver comprises an optical port configured to receive an encoded optical signal, and a demodulation block indirectly coupled to the port and comprising a multiplexer, wherein the multiplexer is configured to receive an encoded electrical signal, wherein the encoded electrical signal is associated with the encoded optical signal, and wherein the encoded electrical signal is encoded using a code division multiple access (CDMA) scheme, receive a code associated with the scheme, perform a dot multiplication of the encoded electrical signal and the code, and generate a differential voltage based on the dot multiplication.
Claims14
An optical receiver comprising:
- an optical port configured to receive an encoded optical signal;
- and
- a demodulation block indirectly coupled to the port and comprising a multiplexer, wherein the multiplexer is configured to:
- receive an encoded electrical signal, wherein the encoded electrical signal is associated with the encoded optical signal, and wherein the encoded electrical signal is encoded using a code division multiple access (CDMA) scheme,
- receive a code associated with the scheme,
- perform a dot multiplication of the encoded electrical signal and the code, and
- generate a differential voltage based on the dot multiplication.
A method comprising:
- receiving an optical signal;
- converting a first portion of the optical signal into a real analog signal;
- converting a second portion of the optical signal into an imaginary analog signal;
- performing a first dot multiplication of the real analog signal and a first code associated with a code division multiple access (CDMA) scheme to produce a real decoded analog signal;
- and
- performing a second dot multiplication of the imaginary analog signal and a second code associated with the CDMA scheme to produce an imaginary decoded analog signal.
A communications system comprising:
- a central office (CO) comprising legacy equipment and a baseband unit (BBU), wherein the BBU comprises:
- a cellular transceiver, and
- a code division multiple access (CDMA) modulation block indirectly coupled to the cellular transceiver;
- and
- a base station (BS) communicatively coupled to the CO via an optical fiber.
Dependencies are inferred from the claim text.