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The new Versatile Video Coding Standard (VVC) was finalized in July 2020. This new international standard is able to provide a higher compression efficiency by up to 50% for the same subjective quality compared to its predecessor HEVC but at the cost of an increased computational load. This paper investigates the complexity of VVC decoder processing blocks and presents a highly optimized decoder implementation that can achieve 4K 60fps VVC real-time decoding on an x86 based CPU using SIMD instruction extensions of the processor and additional parallel processing including data and task-level parallelism.

96wireless systems such as IMT-Advanced, a relay station needs to assist uplink transmissions originated from multiple user equipment within its coverage simultaneously [1] .General speaking, network coding (NC) is always used in efficient transmission. Full diversity can be achieved in NC cooperation system [2] . Rateless codes(RC), also known as fountain codes, are good at channel adaptability. The cooperation scheme based on RC has advantage on robustness [3] , throughput [4] , computation complexity, memory usage and overall energy consumption [5] . Well then, based on the above-mentioned two kinds of codes, joint network and rateless coding scheme is more preponderant for transmission efficiency, robustness and reliability. Ernest Kurniawan etc. [6] have proposed a novel scheme, which incorporated NC into rateless transmission. Partial information about the upcoming message block is allowed to be transmitted during the current block transmission, which reduces the required number of transmissions and improves the spectral efficiency. Then, Andrew Liau etc. [7] have proposed a new protocol, namely soliton-like rateless coding(SLRC), by exploiting the benefits of fountain coding and NC coding over a Y-network. SLRC exhibits a 5% reduction in overhead compared to the state of the art distributed LT(DLT) codes at high decoding success rates. Furthermore, Kun Pang etc. [8] have proposed a distributed Abstract: In relay-assisted multi-user system, relay coding is important to enhance the robustness and reliability of cooperative transmission. For better adaptability and efficiency, two joint network and fountain coding (JNFC) schemes are proposed. When the condition of all direct channels is worse, JNFC scheme based on distributed LT(DLT) codes is used. Otherwise, JNFC scheme based on multi-dimensional LT(MD-LT) codes is suited. For both two above-mentioned schemes, the united degree distribution design method for short-length fountain codes is proposed. For the latter scheme, MD-LT codes are proposed for equal error protection (EEP) of each user. Simulation results and analysis show that the united degree distribution need less decoding overhead compared with other degree distribution for short-length fountain codes. And then, all users are protected equally in despite of asymmetric uplinks.

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