Method and apparatus for hybrid CDM OFDMA wireless transmission
First Claim
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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 such that increasing the data rate causes the pilot gain to decrease and the data gain to increase and decreasing the data rate causes the pilot gain to increase and the data gain to decrease;
combining the plurality of data streams and the pilot signal into a multiplexed signal containing both the pilot signal and the data signal;
allocating the multiplexed signal to a subset of sub-carriers; and
transmitting the subset of sub-carriers using Discrete Fourier Transform Spread OFDMA.
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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.
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Citations
19 Claims
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1. A method of wireless transmission from a mobile unit to a base station, comprising:
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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 such that increasing the data rate causes the pilot gain to decrease and the data gain to increase and decreasing the data rate causes the pilot gain to increase and the data gain to decrease; combining the plurality of data streams and the pilot signal into a multiplexed signal containing both the pilot signal and the data signal; allocating the multiplexed signal to 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)
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7. A receiver coupled to receive a subset of sub-carriers transmitted from a mobile unit using Discrete Fourier Transform Spread OFDMA, comprising:
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a filter coupled to extract the subset of sub-carriers, wherein the subset of sub-carriers comprise a multiplex signal that contains a plurality of data streams multiplexed with a pilot signal using a plurality of orthogonal Walsh codes wherein the plurality of data streams comprise a data rate and wherein a pilot gain applied to the pilot signal and a data gain applied to the plurality of data streams are a function of the data rate such that increasing the data rate causes the pilot gain to decrease and the data gain to increase and decreasing the data rate causes the pilot gain to increase and the data gain to decrease; 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 from the multiplexed signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of wireless transmission, comprising:
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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 such that increasing the data rate causes the pilot gain to decrease and the data gain to increase and decreasing the data rate causes the pilot gain to increase and the data gain to decrease; combining the plurality of data streams and the pilot signal into a multiplexed signal containing both the plurality of data streams and the pilot signal allocating the multiplexed signal to a subset of sub-carriers; and transmitting the subset of sub-carriers using Discrete Fourier Transform Spread OFDMA. - View Dependent Claims (15, 16, 17, 18)
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19. A receiver coupled to receive a subset of sub-carriers transmitted from a mobile unit using Discrete Fourier Transform Spread OFDMA, comprising:
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a filter coupled to extract the subset of sub-carriers, wherein the subset of sub-carriers comprise a multiplexed signal containing a plurality of data streams multiplexed with a pilot signal using a plurality of orthogonal Walsh codes wherein the plurality of data streams comprise a data rate and wherein a pilot gain applied to the pilot signal and a data gain applied to the plurality of data streams are a function of the data rate such that increasing the data rate causes the pilot gain to decrease and the data gain to increase and decreasing the data rate causes the pilot gain to increase and the data gain to decrease; 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.
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Specification