Method and apparatus for providing variable rate data in a communications system using non-orthogonal overflow channels
First Claim
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1. A system for receiving variable rate packets of data symbols comprising:
- a traffic demodulator using a first plurality of sequences for demodulating a first half of the variable rate packets, the traffic demodulator having an input and having an output, wherein the first plurality of sequences is orthogonal;
an overflow demodulator using a second plurality of sequences for demodulating a second half of the variable rate packets, the overflow demodulator having an input and having an output, wherein the second plurality of sequences is non-orthogonal to the first plurality of sequences; and
a combiner having a first input coupled to said traffic demodulator output and having a second input coupled to said overflow demodulator output and having an output for producing estimates of ones of said variable rate packets received by said system which include in excess of a predefined number of data symbols.
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Abstract
A variable rate transmission system where a packet of variable rate data is transmitted on a traffic channel if the capacity of the traffic channel is greater than or equal to the data rate of the packet. When the rate of the packet of variable rate data exceeds the capacity of the traffic channel, the packet is transmitted on a traffic channel and at least one overflow channel. Also described is a receiving system for receiving and reassembling the data transmitted on the traffic channel and at least one additional overflow channel.
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Citations
8 Claims
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1. A system for receiving variable rate packets of data symbols comprising:
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a traffic demodulator using a first plurality of sequences for demodulating a first half of the variable rate packets, the traffic demodulator having an input and having an output, wherein the first plurality of sequences is orthogonal; an overflow demodulator using a second plurality of sequences for demodulating a second half of the variable rate packets, the overflow demodulator having an input and having an output, wherein the second plurality of sequences is non-orthogonal to the first plurality of sequences; and a combiner having a first input coupled to said traffic demodulator output and having a second input coupled to said overflow demodulator output and having an output for producing estimates of ones of said variable rate packets received by said system which include in excess of a predefined number of data symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification