Transmission method suitable for long term evolution-advanced (LTE-A) over-distance covering under low signal to noise ratio
A low signal-to-noise ratio, transmission method technology, applied in the direction of multi-frequency code system, prevention/detection of errors through diversity reception, etc.
Active Publication Date: 2013-02-20
天元瑞信通信技术股份有限公司
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[0007] The above method can carry out relatively reliable communication under low signal-to-noise ratio, and its bit transmission rate has been improved compared with the single-branch multi-ary system orthogonal coding method, but there is still room for further improvement
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[0030] refer to figure 1 , the application scenario of the present invention is the common downlink ultra-long-distance coverage on the sea surface, the base station is the transmitting end, and is equipped with N tr Antennas, the mobile station is the receiving end, equipped with N rec Antennas, the channel between the transceivers is a time-varying sea surface ultra-distance channel, where N tr Indicates the number of transmitting antennas, N rec Indicates the number of receiving antennas.
[0031] refer to figure 2 , the concrete steps of the present invention are as follows:
[0032] Step 1: Design an improved set of orthogonal code sequences {{p' i (n)}}:
[0033] (1a) Set the Walsh code sequence {{w k (m)}} in each code sequence {w k (m)} The adjacent two symbols that are 1 or -1 are mapped to a complex symbol, that is, the complex symbol Replace the two symbols -1 and -1 with Replace the two symbols 1 and -1 with Replace the two symbols 1 and 1 with Repla...
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The invention discloses a transmission method suitable for long term evolution-advanced (LTE-A) over-distance covering under a low signal to noise ratio, and mainly aims to solve the problem of relatively low bit transmission rate in the prior art. The method comprises the following steps of: (1) improving a Walsh code sequence set; (2) carrying out orthogonal coding on a bit information sequence by an improved orthogonal code sequence and emitting a code element of the orthogonal code sequence by a transmit diversity; (3) carrying out minimum mean square error detection on received signals, and adding and averaging the detected signals to obtain an orthogonal code sequence to be judged; and (4) carrying out the correlation operation on the orthogonal code sequence to be judged and all improved orthogonal code sequences to obtain the orthogonal code sequence number corresponding to the maximum correlation value of a real part, demapping the code sequence number into the bit information sequence, and ending the once transmitting process. According to the method, the error rate under a low signal to noise ratio is low, the data transmission is low and the transmission rate is high; and the method can be used for the signal transmission of the LTE-A over-distance covering under the low signal to noise ratio.
Description
technical field [0001] The invention belongs to the field of mobile communication, and specifically relates to a transmission method suitable for long-term evolution enhanced LTE-A ultra-long-distance coverage under low signal-to-noise ratio, which ensures the transmission of ultra-long-distance users under low signal-to-noise ratio with relatively small rate loss reliability. Background technique [0002] Ultra-long-distance coverage is a scenario of LTE-A enhanced coverage networking. In this scenario, the coverage radius of the base station needs to reach more than 100 km, the transmission distance is long, and the path loss is large. In the LTE-A ultra-long-distance coverage scenario, the average received signal-to-noise ratio on each carrier is below 0dB, which is much lower than the average received signal-to-noise ratio in ordinary cells. [0003] The existing LTE-A transmission methods are mainly space-frequency block code SFBC and Bell Labs layered space-time mult...
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Login to View More IPC IPC(8): H04L27/26H04L1/06
Inventor 李晓辉吴雅颖黑永强
Owner 天元瑞信通信技术股份有限公司