METHOD AND APPARATUS FOR HYBRID CDM OFDMA WIRELESS TRANSMISSION
First Claim
Patent Images
1. A method of wireless transmission from a mobile unit to a base station, comprising:
- multiplexing a pilot signal and a data signal, wherein the data signal operates at a data rate, comprising;
splitting the data signal into a plurality of data streams;
spreading the plurality of data streams and the pilot signal using plurality of orthogonal Walsh codes;
applying a data gain to the plurality of data streams;
applying a pilot gain to the pilot signal, wherein the data gain and the pilot gain are a function of the data rate;
combining the plurality of data streams and the pilot signal into a subset of sub-carriers; and
transmitting the subset of sub-carriers using Discrete Fourier Transform Spread OFDMA.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for wireless transmission from a mobile unit to a base station includes multiplexing a pilot signal and a data signal, wherein the data signal operates at a data rate by splitting the data signal into a plurality of data streams; applying a pilot gain to the pilot channel, wherein the data gain and the pilot gain are a function of the data rate; and combining the plurality of data streams and the pilot signal into a subset of sub-carriers. The subset of sub-carriers are transmitted using Discrete Fourier Transform Spread OFDMA.
85 Citations
23 Claims
-
1. A method of wireless transmission from a mobile unit to a base station, comprising:
-
multiplexing a pilot signal and a data signal, wherein the data signal operates at a data rate, comprising; splitting the data signal into a plurality of data streams; spreading the plurality of data streams and the pilot signal using plurality of orthogonal Walsh codes; applying a data gain to the plurality of data streams; applying a pilot gain to the pilot signal, wherein the data gain and the pilot gain are a function of the data rate; combining the plurality of data streams and the pilot signal into a subset of sub-carriers; and transmitting the subset of sub-carriers using Discrete Fourier Transform Spread OFDMA. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A receiver coupled to receive a subset of sub-carriers transmitted from a mobile unit using Discrete Fourier Transform Spread OFDMA, comprising:
-
a filter coupled to extract the subset of sub-carriers, wherein the subset of sub-carriers comprise a plurality of data streams multiplexed with a pilot signal using a plurality of orthogonal Walsh codes; a Fast Fourier Transform FFT unit coupled to transform the subset of sub-carriers into a frequency domain; an Inverse Fast Fourier Transform (IFFT) coupled to transform the subset of sub-carriers into a time domain; and a rake receiver coupled to extract at least one of the plurality of data streams. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of wireless transmission, comprising:
-
code multiplexing a pilot signal and a data signal, comprising; splitting the data signal into a plurality of data streams; spreading the plurality of data streams and the pilot signal using plurality of orthogonal Walsh codes; differentially adjusting a data gain applied to the plurality of data streams and a pilot gain applied to the pilot channel as a function of a data rate of the data signal; combining the plurality of data streams and the pilot signal into a subset of sub-carriers; and transmitting the subset of sub-carriers using Discrete Fourier Transform Spread OFDMA. - View Dependent Claims (17, 18, 19, 20, 21, 23)
-
-
22. A receiver coupled to receive a subset of sub-carriers transmitted from a mobile unit using Discrete Fourier Transform Spread OFDMA, comprising:
-
a filter coupled to extract the subset of sub-carriers, wherein the subset of sub-carriers comprise a plurality of data streams multiplexed with a pilot signal using a plurality of orthogonal Walsh codes; a Fast Fourier Transform FFT unit coupled to transform the subset of sub-carriers into a frequency domain; an Inverse Fast Fourier Transform (IFFT) coupled to transform the subset of sub-carriers into a time domain; a channel estimator coupled to estimate channels in the time domain; and a frequency domain equalizer coupled to equalize the subset of sub-carriers in the frequency domain.
-
Specification