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Uplink MIMO-LDPC modulation and demodulation system

A demodulation system, LDPC code technology, applied in diversity/multi-antenna systems, error correction/detection using block codes, space transmit diversity, etc., can solve the problems of non-convergence, reduced data transmission rate, occupancy, etc.

Inactive Publication Date: 2009-10-28
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, there are four problems in the existing space-time coding and decoding methods: 1. The mobile station transmitter needs to occupy multiple time slots to generate space-time coding signals, which is equivalent to occupying multiple time-division channels and reducing the data transmission rate; 2. . The mobile station transmitter needs to perform complex multi-space-time coding, which is difficult to achieve for low-complexity and low-cost mobile stations; 3. The improvement of the bit error rate performance of the received signal is actually sacrificing the data transmission rate 4. Failure to provide independent spatial multiplexing channels for mobile stations with constant bandwidth
It makes the LDPC code not converge when iterative decoding

Method used

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  • Uplink MIMO-LDPC modulation and demodulation system
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  • Uplink MIMO-LDPC modulation and demodulation system

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Embodiment Construction

[0114] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0115] figure 1 It is a block diagram of MIMO channel and uplink MIMO-LDPC modulation and demodulation system. Such as figure 1 As shown, the mobile station transmitter transmits the radio frequency modulation signal t(s 1 (k) ) and t(s 2 (k) ), where s 1 (k) and s 2 (k) For encoding signals with LDPC codes, see figure 2 ,

[0116] s 1 ( k ) = b 1 ( k ) G 1 = p 1 ( k ) ...

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Abstract

The invention relates to an uplink MIMO space-time encoding and decoding baseband system. In a cell covered by an MIMO base station, different mobile stations are located in different spatial positions, and different signal channel parameter matrixes can be obtained. The mobile station conducts LDPC coding and radio frequency modulation to the base-band signal and then emits the base-band signal. An MIMO base station receiver conducts radio frequency demodulation to received signals, then uses channel matrix parameters from different mobile stations to the base station to conduct space demodulation to the base-band signal, and then conducts LDPC decoding to obtain restored data. The invention provides an uplink MIMO space-time encoding and decoding base-band system circuit which applies the method. The adoption of the invention enables each connection user to obtain two independent space channels, thus improving the spectrum utilization rate of a wireless communication system and simplifying the design of an MIMO mobile station transmitter.

Description

technical field [0001] The invention relates to a multiple-input multiple-output (MIMO) wireless communication system, especially an uplink MIMO-LDPC baseband modulation and demodulation system. Background technique [0002] MIMO (Multiple-Input Multiple-Out-put) represents the multiple-input multiple-output technology of a multi-antenna wireless communication system, and the MIMO technology uses multiple antennas to suppress channel fading. According to the number of antennas at both ends of the transceiver, compared to the ordinary SISO (Single-Input Single-Output) wireless communication system, the MIMO wireless communication system can also include SIMO (Single-Input Multiple-Output) wireless communication system and MISO (Multiple-Input Single-Output) wireless communication system -Output) wireless communication system. MIMO technology has been considered for 802.11n and 802.16e wireless communication systems. 802.11n and 802.16e are IEEE802.1x standards. 802.11n and ...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08H04L1/06H03M13/11
Inventor 肖扬
Owner BEIJING JIAOTONG UNIV
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