Synchronous code division multiple access communication system
AssigneeZenith Electronics Corporation
InventorsRichard W. Citta, Stephen M. Dicke, David A. Willming
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Abstract
In a synchronous code division multiple access (SCDMA) system, a set of substantially orthogonal code words is selected such that each code word in the set of substantially orthogonal code words is minimally correlated with a channel characteristic such as noise. When a station transmits a data signal, it multiplies the data signal by its assigned code word in order to produce a spread data signal. The spread data signal is transmitted over the channel of the SCDMA system.
Claims58
A method of transmitting a data signal over a communication channel comprising the steps of:
- selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with a characteristic of the communication channel;
- and,
- using a code word of the set of code words in order to transmit the data signal over the communication channel.
A method of transmitting a data signal over a communication channel comprising the steps of:
- selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with noise on the communication channel;
- multiplying the data signal by a code word of the set of substantially orthogonal code words in order to produce a spread data signal;
- and,
- transmitting the spread data signal over the communication channel.
An apparatus for transmitting a data signal over a communication channel comprising:
- means for determining a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with noise on the communication channel;
- means for modulating the data signal with a code word of the set of substantially orthogonal code words;
- and,
- means for transmitting the modulated data signal over the communication channel.
A receiver for receiving a data vector over a communication channel, wherein the data vector is a combination of a code vector and data, wherein the code vector is minimally correlated with a characteristic of the communication channel, the receiver comprising:
- means for receiving the data vector;
- and,
- means for applying a code word to the data vector, wherein the code word is related to the code vector so that, when the code word is applied to the data vector, the data is recovered from the data vector.
An apparatus for transmitting a data signal over a communication channel comprising:
- means for modulating the data signal with a code word, wherein the code word is selected from a set of substantially orthogonal code words, and wherein the code word is minimally correlated with noise on the communication channel;
- and,
- means for transmitting the modulated data signal over the communication channel.
A method of decoding a data vector received over a communication channel, wherein the data vector comprises data converted to the data vector by a code vector, wherein the code vector is minimally correlated with noise oil the communication channel, wherein the method comprises the following steps:
- correlating the data vector to a decode word to produce a correlation result, wherein the decode word is related to the code vector;
- and,
- recovering the data from the correlation result.
Dependencies are inferred from the claim text.