Communication system

• US 20050018785A1
• Filed: 10/30/2003
• Published: 01/27/2005
• Est. Priority Date: 03/26/1992
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Mitsuaki Oshima
• Inventors: Oshima, Mitsuaki
• Granted Patent: US 7,362,813 B2
• Time in Patent Office: Days
• US Class Current: 375/265
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/253 with concatenated codes
• CPC Class Codes: H03M 13/256 with trellis coding, e.g. with convolutional codes and TCM
• CPC Class Codes: H03M 13/2936 comprising an outer Reed-Solomon code and an inner convolutional code
• CPC Class Codes: H03M 13/35 Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H03M 13/6538 ATSC VBS systems
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0058 Block-coded modulation
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 2001/0098 Unequal error protection
• CPC Class Codes: H04L 2027/0036 using a recovered symbol clock
• CPC Class Codes: H04L 2027/0053 Closed loops
• CPC Class Codes: H04L 2027/0067 Phase error detectors
• CPC Class Codes: H04L 27/02 : Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/04 : Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/183 : Multiresolution systems
• CPC Class Codes: H04L 27/2602 : Signal structure
• CPC Class Codes: H04L 27/2604 : Multiresolution systems by means of multiresolution subcarriers H04L27/183, H04L27/3488
• CPC Class Codes: H04L 27/2627 : Modulators
• CPC Class Codes: H04L 27/2649 : Demodulators
• CPC Class Codes: H04L 27/3405 : Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
• CPC Class Codes: H04L 27/3488 : Multiresolution systems
• CPC Class Codes: H04L 27/36 : Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/38 : Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/3854 : using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
• CPC Class Codes: H04L 5/0007 : the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0046 : Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04N 11/26 : involving two-channel transmission
• CPC Class Codes: H04N 19/30 : using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/37 : with arrangements for assigning different transmission priorities to video input data or to video coded data
• CPC Class Codes: H04N 19/60 : using transform coding
• CPC Class Codes: H04N 19/63 : using sub-band based transform, e.g. wavelets
• CPC Class Codes: H04N 21/234327 : by decomposing into layers, e.g. base layer and one or more enhancement layers
• CPC Class Codes: H04N 21/2383 : Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/426 : Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4382 : Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4383 : Accessing a communication channel
• CPC Class Codes: H04N 21/440272 : for performing aspect ratio conversion
• CPC Class Codes: H04N 21/44209 : Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896
• CPC Class Codes: H04N 21/4425 : Monitoring of client processing errors or hardware failure
• CPC Class Codes: H04N 21/4621 : Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10
• CPC Class Codes: H04N 21/631 : Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
• CPC Class Codes: H04N 5/455 : Demodulation-circuits
• CPC Class Codes: H04N 7/015 : High-definition television systems
• CPC Class Codes: H04N 7/24 : Systems for the transmission of television signals using pulse code modulation H04N21/00 takes precedence

Abstract

At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data stream respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability.

Claims

1-38. -38. (canceled)

39. A telephone for transmitting a first transmission signal and receiving a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level QAM to produce a modulated signal;

a transmitter operable to transmit the modulated signal as the first transmission signal;

a receiver operable to receive the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level QAM, the third data stream is modulated according to an n-level QAM, and the second data stream has information of n; and

a demodulator operable to demodulate the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

40. A telephone according to claim 39, wherein m is an integer and equal to or less than 4.

41. A telephone according to claim 39, wherein n is an integer and equal to or greater than 4.

42. A telephone for transmitting a first transmission signal and receiving a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level PSK to produce a modulated signal;

a transmitter operable to transmit the modulated signal as the first transmission signal;

a receiver operable to receive the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level PSK, the third data stream is modulated according to an n-level PSK, and the second data stream has information of n; and

a demodulator operable to demodulate the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

43. A telephone according to claim 42, wherein m is an integer and equal to or less than 4.

44. A telephone according to claim 42, wherein n is an integer and equal to or greater than 4.

45. A telephone for transmitting a first transmission signal and receiving a second transmission signal, comprising:

a modulator operable to assign a first data stream to a constellation in a vector space diagram to produce a modulated signal, wherein the number of signal points of the constellation for the first data stream is m;

a transmitter operable to transmit the modulated signal;

a receiver operable to receive the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the number of signal points of the constellation for the second data stream is m, the number of signal points of the constellation for the third data stream is n, and the second data stream has information of n; and

a demodulator operable to demodulate the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

46. A telephone according to claim 45, wherein m is an integer and equal to or less than 4.

47. A telephone according to claim 45, wherein n is an integer and equal to or greater than 4.

48. A telephone for transmitting a first transmission signal and receiving a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level QAM to produce a first modulated signal;

a multiplexer operable to convert the first modulated signal to a CDMA converted signal according to CDMA;

a transmitter operable to transmit the CDMA converted signal as the first transmission signal;

a receiver operable to receive the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level QAM, the third data stream is modulated according to an n-level QAM, and the second data stream has information of n;

a de-multiplexer operable to convert the second transmission signal to a second modulated signal according to CDMA; and

a demodulator operable to demodulate the second modulated signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

49. A telephone according to claim 48, wherein m is an integer and equal to or less than 4.

50. A telephone according to claim 48, wherein n is an integer and equal to or greater than 4.

51. A telephone for transmitting a first transmission signal and receiving a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level PSK to produce a first modulated signal;

a multiplexer operable to convert the first modulated signal to a CDMA converted signal according to CDMA;

a transmitter operable to transmit the CDMA converted signal as the first transmission signal;

a receiver operable to receive the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level PSK, the third data stream is modulated according to an n-level PSK, and the second data stream has information of n;

a de-multiplexer operable to convert the second transmission signal to a second modulated signal according to CDMA; and

a demodulator operable to demodulate the second modulated signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

52. A telephone according to claim 51, wherein m is an integer and equal to or less than 4.

53. A telephone according to claim 51, wherein n is an integer and equal to or greater than 4.

54. A telephone for transmitting a first transmission signal and receiving a second transmission signal, comprising:

a modulator operable to assign a first data stream to a constellation in a vector space diagram to produce a first modulated signal, wherein the number of signal points of the constellation for the first data stream is m;

a multiplexer operable to convert the first modulated signal to a CDMA converted signal according to CDMA;

a transmitter operable to transmit the CDMA converted signal as the first transmission signal;

a receiver operable to receive the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the number of signal points of the constellation for the second data stream is m, the number of signal points of the constellation for the third data stream is n, and the second data stream has information of n;

a de-multiplexer operable to convert the second transmission signal to a second modulated signal according to CDMA; and

a demodulator operable to demodulate the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

55. A telephone according to claim 54, wherein m is an integer and equal to or less than 4.

56. A telephone according to claim 54, wherein n is an integer and equal to or greater than 4.

57. A base station for receiving a first transmission signal and transmitting a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level QAM and modulate a second data stream according to an n-level QAM to produce modulated signals, wherein the first data stream has information of n;

a transmitter operable to transmit the modulated signals as the second transmission signal;

a receiver operable to receive the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level QAM; and

a demodulator operable to demodulate the first transmission signal to produce the third data stream.

58. A base station according to claim 57, wherein m is an integer and equal to or less than 4.

59. A base station according to claim 57, wherein n is an integer and equal to or greater than 4.

60. A base station for receiving a first transmission signal and transmitting a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level PSK and modulate a second data stream according to an n-level PSK to produce modulated signals, wherein the first data stream has information of n;

a transmitter operable to transmit the modulated signals as the second transmission signal;

a receiver operable to receive the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level PSK; and

a demodulator operable to demodulate the first transmission signal to produce the third data stream.

61. A base station according to claim 60, wherein m is an integer and equal to or less than 4.

62. A base station according to claim 60, wherein n is an integer and equal to or greater than 4.

63. A base station for receiving a first transmission signal and transmitting a second transmission signal, comprising:

a modulator operable to assign a first data stream to a constellation in a vector space diagram and assign a second data stream to a constellation in a vector space diagram to produce modulated signals, wherein the number of signal points of the constellation for the first data stream is m, the number of signal points of the constellation for the second data stream is n, and the first data stream has information of n;

a transmitter operable to transmit the modulated signals as the second transmission signal;

a receiver operable to receive the first transmission signal, wherein the first transmission signal has information of a third data stream, and the number of signal points of the constellation for the third data stream is m; and

a demodulator operable to demodulate the first transmission signal to produce the third data stream.

64. A base station according to claim 63, wherein m is an integer and equal to or less than 4.

65. A base station according to claim 63, wherein n is an integer and equal to or greater than 4.

66. A base station for receiving a first transmission signal and transmitting a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level QAM and modulate a second data stream according to an n-level QAM to produce modulated signals, wherein the first data stream has information of n;

a multiplexer operable to convert the modulated signals to a CDMA converted signal according to CDMA;

a transmitter operable to transmit the CDMA converted signal as the second transmission signal;

a receiver operable to receive the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level QAM;

a de-multiplexer operable to convert the first transmission signal to a modulated signal according to CDMA; and

a demodulator operable to demodulate the modulated signal to produce the third data stream.

67. A base station according to claim 66, wherein m is an integer and equal to or less than 4.

68. A base station according to claim 66, wherein n is an integer and equal to or greater than 4.

69. A base station for receiving a first transmission signal and transmitting a second transmission signal, comprising:

a modulator operable to modulate a first data stream according to an m-level PSK and modulate a second data stream according to an n-level PSK to produce modulated signals, wherein the first data stream has information of n;

a multiplexer operable to convert the modulated signals to a CDMA converted signal according to CDMA;

a transmitter operable to transmit the CDMA converted signal as the second transmission signal;

a receiver operable to receive the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level PSK;

a de-multiplexer operable to convert the first transmission signal to a modulated signal according to CDMA; and

a demodulator operable to demodulate the modulated signal to produce the third data stream.

70. A base station according to claim 69, wherein m is an integer and equal to or less than 4.

71. A base station according to claim 69, wherein n is an integer and equal to or greater than 4.

72. A base station for receiving a first transmission signal and transmitting a second transmission signal, comprising:

a modulator operable to assign a first data stream to a constellation in a vector space diagram and assign a second data stream to a constellation in a vector space diagram to produce modulated signals, wherein the number of signal points of the constellation for the first data stream is m, the number of signal points of the constellation for the second data stream is n, and the first data stream has information of n;

a multiplexer operable to convert the modulated signals to a CDMA converted signal according to CDMA;

a transmitter operable to transmit the CDMA converted signal as the second transmission signal;

a receiver operable to receive the first transmission signal, wherein the first transmission signal has information of a third data stream, and the number of signal points of the constellation for the third data stream is m;

a de-multiplexer operable to convert the first transmission signal to a modulated signal according to CDMA; and

a demodulator operable to demodulate the modulated signal to produce the third data stream.

73. A base station according to claim 72, wherein m is an integer and equal to or less than 4.

74. A base station according to claim 72, wherein n is an integer and equal to or greater than 4.

75. A transmission and receiving method for transmitting a first transmission signal and receiving a second transmission signal, comprising:

modulating a first data stream according to an m-level QAM to produce a modulated signal;

transmitting the modulated signal as the first transmission signal;

receiving the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level QAM, the third data stream is modulated according to an n-level QAM, and the second data stream has information of n; and

demodulating the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

76. A transmission and receiving method according to claim 75, wherein m is an integer and equal to or less than 4.

77. A transmission and receiving method according to claim 75, wherein n is an integer and equal to or greater than 4.

78. A transmission and receiving method for transmitting a first transmission signal and receiving a second transmission signal, comprising:

modulating a first data stream according to an m-level PSK to produce a modulated signal;

transmitting the modulated signal as the first transmission signal;

receiving the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level PSK, the third data stream is modulated according to an n-level PSK, and the second data stream has information of n; and

demodulating the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

79. A transmission and receiving method according to claim 78, wherein m is an integer and equal to or less than 4.

80. A transmission and receiving method according to claim 78, wherein n is an integer and equal to or greater than 4.

81. A transmission and receiving method for transmitting a first transmission signal and receiving a second transmission signal, comprising:

assigning a first data stream to a constellation in a vector space diagram to produce a modulated signal, wherein the number of signal points of the constellation for the first data stream is m;

transmitting the modulated signal;

receiving the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the number of signal points of the constellation for the second data stream is m, the number of signal points of the constellation for the third data stream is n, and the second data stream has information of n; and

demodulating the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

82. A transmission and receiving method according to claim 81, wherein m is an integer and equal to or less than 4.

83. A transmission and receiving method according to claim 81, wherein n is an integer and equal to or greater than 4.

84. A transmission and receiving method for transmitting a first transmission signal and receiving a second transmission signal, comprising:

modulating a first data stream according to an m-level QAM to produce a first modulated signal;

converting the first modulated signal to a CDMA converted signal according to CDMA;

transmitting the CDMA converted signal as the first transmission signal;

receiving the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level QAM, the third data stream is modulated according to an n-level QAM, and the second data stream has information of n;

converting the second transmission signal to a second modulated signal according to CDMA; and

demodulating the second modulated signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

85. A transmission and receiving method according to claim 84, wherein m is an integer and equal to or less than 4.

86. A transmission and receiving method according to claim 84, wherein n is an integer and equal to or greater than 4.

87. A transmission and receiving method for transmitting a first transmission signal and receiving a second transmission signal, comprising:

modulating a first data stream according to an m-level PSK to produce a first modulated signal;

converting the first modulated signal to a CDMA converted signal according to CDMA;

transmitting the CDMA converted signal as the first transmission signal;

receiving the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the second data stream is modulated according to an m-level PSK, the third data stream is modulated according to an n-level PSK, and the second data stream has information of n;

converting the second transmission signal to a second modulated signal according to CDMA; and

demodulating the second modulated signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

88. A transmission and receiving method according to claim 87, wherein m is an integer and equal to or less than 4.

89. A transmission and receiving method according to claim 87, wherein n is an integer and equal to or greater than 4.

90. A transmission and receiving method for transmitting a first transmission signal and receiving a second transmission signal, comprising:

assigning a first data stream to a constellation in a vector space diagram to produce a first modulated signal, wherein the number of signal points of the constellation for the first data stream is m;

converting the first modulated signal to a CDMA converted signal according to CDMA;

transmitting the CDMA converted signal as the first transmission signal;

receiving the second transmission signal, wherein the second transmission signal has information of a second data stream and a third data stream, the number of signal points of the constellation for the second data stream is m, the number of signal points of the constellation for the third data stream is n, and the second data stream has information of n;

converting the second transmission signal to a second modulated signal according to CDMA; and

demodulating the second transmission signal to produce the second data stream and the third data stream, wherein the third data stream is produced according to the information of n obtained from the second data stream.

91. A transmission and receiving method according to claim 90, wherein m is an integer and equal to or less than 4.

92. A transmission and receiving method according to claim 90, wherein n is an integer and equal to or greater than 4.

93. A receiving and transmitting method for receiving a first transmission signal and transmitting a second transmission signal, comprising:

modulating a first data stream according to an m-level QAM and modulating a second data stream according to an n-level QAM to produce modulated signals, wherein the first data stream has information of n;

transmitting the modulated signals as the second transmission signal;

receiving the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level QAM; and

demodulating the first transmission signal to produce the third data stream.

94. A receiving and transmitting method according to claim 93, wherein m is an integer and equal to or less than 4.

95. A receiving and transmitting method according to claim 93, wherein n is an integer and equal to or greater than 4.

96. A receiving and transmitting method for receiving a first transmission signal and transmitting a second transmission signal, comprising:

modulating a first data stream according to an m-level PSK and modulating a second data stream according to an n-level PSK to produce modulated signals, wherein the first data stream has information of n;

transmitting the modulated signals as the second transmission signal;

receiving the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level PSK; and

demodulating the first transmission signal to produce the third data stream.

97. A receiving and transmitting method according to claim 96, wherein m is an integer and equal to or less than 4.

98. A receiving and transmitting method according to claim 96, wherein n is an integer and equal to or greater than 4.

99. A receiving and transmitting method for receiving a first transmission signal and transmitting a second transmission signal, comprising:

assigning a first data stream to a constellation in a vector space diagram and assigning a second data stream to a constellation in a vector space diagram to produce modulated signals, wherein the number of signal points of the constellation for the first data stream is m, the number of signal points of the constellation for the second data stream is n, and the first data stream has information of n;

transmitting the modulated signals as the second transmission signal;

receiving the first transmission signal, wherein the first transmission signal has information of a third data stream, and the number of signal points of the constellation for the third data stream is m; and

demodulating the first transmission signal to produce the third data stream.

100. A receiving and transmitting method according to claim 99, wherein m is an integer and equal to or less than 4.

101. A receiving and transmitting method according to claim 99, wherein n is an integer and equal to or greater than 4.

102. A receiving and transmitting method for receiving a first transmission signal and transmitting a second transmission signal, comprising:

modulating a first data stream according to an m-level QAM and modulating a second data stream according to an n-level QAM to produce modulated signals, wherein the first data stream has information of n;

converting the modulated signals to a CDMA converted signal according to CDMA;

transmitting the CDMA converted signal as the second transmission signal;

receiving the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level QAM;

converting the first transmission signal to a modulated signal according to CDMA; and

demodulating the modulated signal to produce the third data stream.

103. A receiving and transmitting method according to claim 102, wherein m is an integer and equal to or less than 4.

104. A receiving and transmitting method according to claim 102, wherein n is an integer and equal to or greater than 4.

105. A receiving and transmitting method for receiving a first transmission signal and transmitting a second transmission signal, comprising:

modulating a first data stream according to an m-level PSK and modulating a second data stream according to an n-level PSK to produce modulated signals, wherein the first data stream has information of n;

converting the modulated signals to a CDMA converted signal according to CDMA;

transmitting the CDMA converted signal as the second transmission signal;

receiving the first transmission signal, wherein the first transmission signal has information of a third data stream, and the third data stream is modulated according to an m-level PSK;

converting the first transmission signal to a modulated signal according to CDMA; and

demodulating the modulated signal to produce the third data stream.

106. A receiving and transmitting method according to claim 105, wherein m is an integer and equal to or less than 4.

107. A receiving and transmitting method according to claim 105, wherein n is an integer and equal to or greater than 4.

108. A receiving and transmitting method for receiving a first transmission signal and transmitting a second transmission signal, comprising:

assigning a first data stream to a constellation in a vector space diagram and assigning a second data stream to a constellation in a vector space diagram to produce modulated signals, wherein the number of signal points of the constellation for the first data stream is m, the number of signal points of the constellation for the first data stream is n, and the first data stream has information of n;

converting the modulated signals to a CDMA converted signal according to CDMA;

transmitting the CDMA converted signal as the second transmission signal;

receiving the first transmission signal, wherein the first transmission signal has information of a third data stream, and the number of signal points of the constellation for the third data stream is m;

converting the first transmission signal to a modulated signal according to CDMA; and

demodulating the modulated signal to produce the third data stream.

109. A receiving and transmitting method according to claim 108, wherein m is an integer and equal to or less than 4.

110. A receiving and transmitting method according to claim 108, wherein n is an integer and equal to or greater than 4.