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Multi-user CDMA (Code Division Multiple Access) communication method and corresponding transmitter and receiver

A code division multiple access and communication method technology, applied in the field of wireless communication, can solve the problems of affecting multi-user access performance, low cross-correlation, not easy to guarantee, etc.

Active Publication Date: 2016-04-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low cross-correlation between binary pseudo-random real number sequences, especially shorter binary pseudo-random real number sequences, it is not easy to guarantee, which will lead to serious multi-user interference, which will inevitably affect multi-user access performance

Method used

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  • Multi-user CDMA (Code Division Multiple Access) communication method and corresponding transmitter and receiver
  • Multi-user CDMA (Code Division Multiple Access) communication method and corresponding transmitter and receiver
  • Multi-user CDMA (Code Division Multiple Access) communication method and corresponding transmitter and receiver

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Experimental program
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Embodiment 1

[0116] This embodiment provides a multi-user code division multiple access communication method and a corresponding transmitter and receiver. The transmitter (such as the terminal in the transceiver system, also known as the terminal transmitter) processes the signal such as figure 1 As shown, the data bits to be sent are coded and modulated first to obtain data symbols, and the data symbols are spread with a complex spreading sequence to obtain a spread symbol sequence, which is then modulated by a carrier to form a transmission signal and then transmitted.

[0117] The flow of the multi-user code division multiple access communication method on the transmitter side of this embodiment is as follows figure 2 shown, including:

[0118] Step 110, determine the complex number spreading sequence to be used, each element of the complex number spreading sequence is a complex number, and the values ​​of the real part and the imaginary part of all elements in the complex number spre...

Embodiment 2

[0164] This embodiment relates to a multi-user code division multiple access communication method on the receiver side and a corresponding receiver. The receiver (such as a base station in a transceiver system) receives signals and processes them as follows: Figure 4 As shown in the figure, the signal transmitted by L transmitters is shown in the figure (for the processing when each transmitter transmits a signal, see figure 1 As shown), after wireless propagation in the air, the receiver receives the superimposed signal of the signals transmitted by L transmitters, and the interference cancellation signal detector receives and detects the superimposed signal to obtain the data sent by each transmitter. Preferably, the interference cancellation signal detector is a serial interference cancellation (Successive Interference Cancellation, SIC) signal detector.

[0165] Figure 5 The flow of the multi-user code division multiple access communication method on the receiver side i...

Embodiment 3

[0191] This embodiment provides a method for generating a complex spread sequence. The transmitter generates a complex spread sequence based on two pseudorandom real number sequences. The values ​​of all elements in the two pseudorandom real number sequences come from the example The M-element real number set described in 1 and 2, and the length of the two pseudo-random real number sequences is the same as the length of the complex extended sequence.

[0192] In this embodiment, two pseudo-random real number sequences are independently generated by two pseudo-random sequence generators in the transmitter, such as Figure 7 As shown, the first pseudo-random sequence generator generates a pseudo-random first real number sequence with the same length as the complex extended sequence, and the second pseudo-random sequence generator generates a pseudo-random second real number sequence with the same length as the complex extended sequence.

[0193] In another embodiment, such as ...

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Abstract

The invention comprises a multi-user CDMA communication method, a corresponding transmitter and a corresponding receiver. The communication method comprises that the transmitter determines a complex number expansion sequence, each element of the complex number expansion sequence is a complex number, values of the rear part and the imaginary part of all the elements in the complex number expansion sequence are all from an M-element real number set, and M represents an integer greater than or equivalent to 2; data symbols to be sent are expanded by utilizing the complex number expansion sequence to generate an expanded symbol sequence; and the expanded symbol sequence is sent. The receiver receives signals from multiple transmitters, an interference elimination signal detector is used for reception and detection, and the complex number expansion sequences used by the transmitters are used during detection. The multi-user CDMA performance can be improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a multi-user code division multiple access communication method and a corresponding transmitter and receiver. Background technique [0002] Uplink multi-user access can be through different multiple access technologies such as: time division multiple access (TimeDivisionMultipleAccess, TDMA), frequency division multiple access (FrequencyDivisionMultipleAccess, FDMA), code division multiple access (CodeDivisionMultipleAccess, CDMA) and space division multiple access ( Space Division Multiple Access, SDMA). Among them, multi-user code division multiple access communication technology is a very important category of uplink multi-user access communication technology, which can provide excellent access performance, and thus has been adopted by many wireless communication standards. [0003] In the access process using code division multiple access, first, each access terminal fi...

Claims

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Application Information

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IPC IPC(8): H04J13/10H04L27/26
CPCH04J2013/0037H04J13/10H04J13/0025H04L27/2691H04L5/026H04L5/0016H04L27/26
Inventor 袁志锋李卫敏刘向宇郁光辉
Owner ZTE CORP
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