Relay demodulating and forwarding system and method for overcoming signal distortion
A signal distortion and relay solution technology, applied in transmission systems, digital transmission systems, baseband system components, etc., can solve the problems of terminal receiving performance loss, signal distortion, loss of soft information, etc., to improve terminal receiving performance, overcome The effect of signal distortion
Inactive Publication Date: 2013-10-09
SHANGHAI RES CENT FOR WIRELESS COMM
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However, because there is no decoding, the relay cannot know whether the information after the hard judgment is correct. If there is an error, the hard judgment will lose the soft information and then re-modulate, especially when the modulation method of the second hop is different from that of the first hop. When the modulation method is used, re-modulation will introduce additional signal distortion, which will cause loss of terminal receiving performance
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[0030] Please refer to figure 2 As shown, a relay demodulation and forwarding system for overcoming signal distortion, the system includes a source, a relay connected to the source through a channel, and a terminal connected to the relay through a channel, and the source includes sequentially connected codes The module is used to channel encode the information bits to be transmitted to obtain coded bits; the rate matching module is used to puncture the coded bits to match the code rate adaptively selected according to the channel quality; the modulation module is used to The punctured coded bits are mapped into the selected modulated complex symbols according to the regulation of the modulation method; the interleaving module is used to scramble the sequence of the modulated complex symbols to overcome the burst error caused by the deep fading of the channel;
[0031] The relay includes an equalization module connected in sequence, which is used to equalize the complex symbol...
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The invention relates to a relay demodulating and forwarding system and method for overcoming signal distortion. The specific steps of the method are as follows: a relay utilizes a soft-modulated coding bit posterior probability to calculate a re-modulated symbol expected value, wherein mod2 indicates the modulation mode of a second jump selection; and the relay maps the calculated symbol expected value to a constellation point of the mod2 according to a certain norm, such as the minimum Euclidean distance norm. By adopting the invention, error spread of the decoding and forwarding technology is reduced, and particularly, the spectrum effectiveness of the system under centralized scheduling is improved.
Description
technical field [0001] The invention relates to the problem field that the relay demodulation and forwarding scheme introduces additional signal distortion, and proposes a relay demodulation and forwarding method for overcoming signal distortion. The invention is applicable to various scenarios where there are relays, including two-hop or multi-hop, cooperative relay or non-cooperative relay, transparent relay or non-transparent relay and the like. Background technique [0002] Relay technology has attracted widespread attention because of its ability to effectively increase coverage and enhance system throughput. Among the relaying and forwarding technologies extensively studied at present, the demodulation and forwarding technology is one of the most important relaying and forwarding technologies. The relay that uses demodulation and forwarding mainly performs equalization, demodulation, hard judgment and remodulation on the received signal from the base station, and then...
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IPC IPC(8): H04L25/03H04L1/00H04B7/005
Inventor 周婷徐景王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM