Enhanced Channel Coding for OFDM-based UWB Systems

Low Complexity LDPC Code Decoders for Next Generation Standards

“…It has been also demonstrated that further reduction on chip area can be achieved if the code is designed enforcing the awareness of the decoder implementation bottlenecks. Indeed future standard like UWB propos-LDPC Code f [3,2] = { 3 / 4 , 1 / 4 } g [11] Table 3. Synthesis Results for a proposed UWB LDPC Code als have to take into account other issues such as the impact of node distribution or the decoding schedule, in addition to the well-known actual block-partitioned matrices.…”

“…Using a posteriori values also allows for using only one permutation network for the layered architecture. More details regarding both architectures can be found in [4] and [3].…”

“…For this purpose, a so-called Ultra-Sparse LDPC code [3] was designed by using the 2V-PEG approach presented in [15]. In the last row of Table 1 the exceptional small maximum VN and CN degree for a rate 3 / 4 is demonstrated.…”

A synthesizable IP core for WiMedia 1.5 UWB LDPC code decoding

“…Investigations have shown the superiority of LDPC codes over the previously used convolutional codes in the context of OFDM-based UWB systems [3] [4]. In comparison they showed a high coding gain of up to 3 dB.…”

“…They allow for the exploitation of the inherent parallelism of the LDPC decoding algorithm yielding high decoder throughputs. Using very sparse parity check matrices as proposed in [3] decreases the decoder complexity even further. In the new WiMedia standard, the decoder has to satisfy tight constraints regarding throughput, latency, and flexibility, making the decoder design very challenging.…”