Method and apparatus for transmission and reception of data
AssigneeMotorola, Inc.
InventorsMickael D. Batariere, Brian K. Classon
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Abstract
To address the need for reducing pilot overhead, a method and apparatus for transmitting and receiving data is provided herein. A communication system having a transmitter (100) that utilizes adaptive modulation and coding (AMC) and utilizes lower-order modulated (e.g., QPSK) data as a substitute for pilot symbols during transmission. Data intended for a user utilizing a lower order modulation can be reliably detected, and if properly processed, used as pilots for a user that is trying to receive a higher order modulation (e.g., 64-QAM). Because lower order modulated data is utilized for pilots, fewer overall pilots are used. This greatly reduces pilot overhead, increasing data throughput.
Claims20
A method for data transmission, the method comprising the steps of:
- determining a modulation coding for a plurality of data streams, wherein each of the plurality of data streams utilizes one of several available modulation and coding schemes;
- and
- multiplexing the plurality of data streams onto a frame, wherein the order of multiplexing the plurality of data streams is based on a type of modulation utilized for transmission for the plurality of data streams.
A method for data reception, the method comprising the steps of:
- receiving a frame of data having lower order modulated data multiplexed proximal to higher order modulated data.;
- utilizing a pilot transmission for providing channel estimation to aid in subsequent demodulation of a transmitted signal;
- and
- utilizing lower order modulated data to provide channel estimation to aid in subsequent demodulation of the transmitted signal.
An apparatus comprising:
- a plurality of modulators outputting a plurality of data streams;
- a switch coupled to the plurality of modulators;
- and
- a transmission format controller coupled to the switch and instructing the switch to multiplex the plurality of data streams onto a frame, wherein the order of multiplexing the plurality of data streams is based on a type of modulation utilized for transmission for the plurality of data streams.
An apparatus comprising:
- a pilot channel estimator for utilizing a pilot transmission for providing channel estimation to aid in subsequent demodulation of a transmitted signal;
- and
- a data channel estimator for utilizing lower order modulated data providing channel estimation to aid in subsequent demodulation of the transmitted signal.
Dependencies are inferred from the claim text.