US 9,077,471 B2 · Code division muliplexing method, transmitting device and receiving device using the method

Abstract

There are provided a code division multiplexing method as well as a transmitting device and a receiving device using the method. The method performs code division multiplexing of a plurality of signals by using a code matrix, the code matrix comprising a plurality of code words, the number of which is the same as the number of the plurality of signals, with each code word comprising a plurality of chips, the method comprising: multiplying each signal of the plurality of signals by each chip of a corresponding code word respectively; and calculating a sum of products of the respective chips in each code word and the corresponding signals to form a plurality of multiplexed signals, wherein, corresponding chips of the respective code words constitute multiple sets of chips, and only one term in differences or sums of any one set of chips and one set of chips among other sets of chips is not zero. The code division multiplexing method as well as the transmitting device and the receiving device according to the present disclosure can make the influence of the selectivity of channels when de-multiplexing is performed small, thus improving the channel transmission quality.

Claims21

Dependent claims

A code division multiplexing method of performing code division multiplexing of a plurality of signals by using a code matrix, the code matrix comprising a plurality of chips and a plurality of code words, wherein each vector of a first direction of the code matrix represents one of the code words and each vector of a second direction of the code matrix represents a set of the chips, the number of code words being the same as the number of the plurality of signals, the method comprising:

generating a plurality of products by multiplying teach signal of the plurality of signals by each chip of a corresponding code word of the plurality of code words;
and
forming a plurality of multiplexed signals by calculating a sum of the products generated from a set of chips, for each set of chips,
wherein there is no orthogonal property between the code words of the code matrix;
wherein only one term in a difference or sum of two sets of chips is not zero;
and
wherein the code matrix is:
A
=
[
a
i
,
j
]
a
i
,
j
=
{
b
,
i
≤
j
-
b
,
i
>
j
⁢
⁢
or
⁢
⁢
{
b
,
i
≥
j
-
b
,
i
<
j
wherein, b can be an arbitrary number other than zero.

47 more elements

A de-multiplexing method, comprising:

receiving a plurality of multiplexed signals, the plurality of multiplexed signals having been obtained by performing code division multiplexing using a code matrix on a plurality of signals;
and
de-multiplexing the plurality of multiplexed signals by calculating a difference or sum of each of multiple pairs of the plurality of multiplexed signals to obtain each of the signals of the plurality of signals;
wherein the code matrix comprises a plurality of chips and a plurality of code words, wherein each vector of a first direction of the code matrix represents one of the code words and each vector of a second direction of the code matrix represents a set of the chips, the number of code words being the same as the number of the plurality of signals, and wherein the plurality of multiplexed signals are obtained by multiplying each signal of the plurality of signals by each chip of a corresponding code word of the plurality of code words, and calculating a sum of the products generated from a set of chips for each set of chips;
wherein the absolute values of the respective chips are the same;
wherein the code matrix is:
A
=
[
a
i
,
j
]
a
i
,
j
=
{
b
,
i
≤
j
-
b
,
i
>
j
⁢
⁢
or
⁢
⁢
{
b
,
i
≥
j
-
b
,
i
<
j
wherein, b can be an arbitrary number other than zero.

46 more elements

A transmitting device for performing code division multiplexing of a plurality of signals by using a code matrix comprising a plurality of chips and a plurality of code words, wherein each vector of a first direction of the code matrix represents one of the code words and each vector of a second direction of the code matrix represents a set of the chips, the number of code words being the same as the number of the plurality of signals, the transmitting device comprising:

a multiplexing unit for forming a plurality of multiplexed signals by generating a plurality of products by multiplying each signal of the plurality of signals by each chip of a corresponding code word of the plurality of code words, and calculating a sum of the products generated from a set of chips, for each set of chips;
and
a transmitting unit for transmitting the plurality of multiplexed signals,
wherein there is no orthogonal property between the code words of the code matrix;
wherein only one term in a difference or sum of two sets of chips is not zero;
and
wherein the code matrix is:
A
=
[
a
i
,
j
]
a
i
,
j
=
{
b
,
i
≤
j
-
b
,
i
>
j
⁢
⁢
or
⁢
⁢
{
b
,
i
≥
j
-
b
,
i
<
j
wherein, b can be an arbitrary number other than zero.

47 more elements

A receiving device, comprising:

a receiving unit for receiving a plurality of multiplexed signals, the plurality of multiplexed signals having been obtained by performing code division multiplexing using a code matrix on a plurality of signals;
and
a de-multiplexing unit for de-multiplexing the plurality of multiplexed signals by calculating a difference or sum of multiple pairs of the plurality of multiplexed signals to obtain each of the signals of the plurality of signals;
wherein the code matrix comprises a plurality of chips and a plurality of code words, wherein each vector of a first direction of the code matrix represents one of the code words and each vector of a second direction of the code matrix represents a set of the chips, the number of code words being the same as the number of the plurality of signals, and wherein the plurality of multiplexed signals are obtained by multiplying each signal of the plurality of signals by each chip of a corresponding code word of the plurality of code words, and calculating a sum of the products generated from a set of chips for each set of chips;
wherein the absolute values of the respective chips are the same;
wherein the code matrix is:
A
=
[
a
i
,
j
]
a
i
,
j
=
{
b
,
i
≤
j
-
b
,
i
>
j
⁢
⁢
or
⁢
⁢
{
b
,
i
≥
j
-
b
,
i
<
j
wherein, b can be an arbitrary number other than zero.

46 more elements

Dependencies are inferred from the claim text.

Code division muliplexing method, transmitting device and receiving device using the method

Life of this patent

Code division muliplexing method, transmitting device and receiving device using the method

Life of this patent

Abstract

Claims21