High data rate CDMA wireless communication system using variable sized channel codes
First Claim
1. A method of transmitting a variable data rate signal comprising:
- interleaving a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols;
repeating the sequence of interleaved symbols at least once; and
repeating a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols.
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Abstract
A method and apparatus for high rate CDMA wireless communication is described. A set of individually gain adjusted subscriber channels are formed via the use of a set of orthogonal subchannel codes having a small number of PN spreading chips per orthogonal waveform period. Data to be transmitted via one of the transmit channels is low code rate error correction encoded and sequence repeated before being modulated with one of the subchannel codes, gain adjusted, and summed with data modulated using the other subchannel codes. The resulting summed data is modulated using a user long code and a pseudorandom spreading code (PN code) and upconverted for transmission. The use of the short orthogonal codes provides interference suppression while still allowing extensive error correction coding and repetition for time diversity to overcome the Raleigh fading commonly experienced in terrestrial wireless systems.
5 Citations
19 Claims
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1. A method of transmitting a variable data rate signal comprising:
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interleaving a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols;
repeating the sequence of interleaved symbols at least once; and
repeating a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transmitter apparatus comprising:
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an interleaver configured to interleave a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols; and
a repeater configured to repeat the sequence of interleaved symbols at least once and repeating a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A transmitter apparatus comprising:
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means for interleaving a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols; and
means for repeating the sequence of interleaved symbols at least once and for additionally repeating a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols.
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Specification